Head Start Participation and School Readiness: Evidence from the Early Childhood Longitudinal Study-Birth Cohort

ERIC Educational Resources Information Center

Lee, RaeHyuck; Zhai, Fuhua; Brooks-Gunn, Jeanne; Han, Wen-Jui; Waldfogel, Jane

2014-01-01

Using data from the Early Childhood Longitudinal Study-Birth Cohort (n ˜ 6,950), a nationally representative sample of children born in 2001, we examined school readiness (academic skills and socioemotional well-being) at kindergarten entry for children who attended Head Start compared with those who experienced other types of child care…

A Snapshot of Young Children's Mathematical Competencies: Results from the Longitudinal Study of Australian Children

ERIC Educational Resources Information Center

MacDonald, Amy; Carmichael, Colin

2015-01-01

This article presents a snapshot of the mathematical competencies of children aged four to five years in Australian early childhood education settings, as perceived by their educators. Data are presented from a nationally-representative sample of 6511 children participating in the Longitudinal Study of Australian Children (LSAC). The results…

Structural Relationships between Social Activities and Longitudinal Trajectories of Depression among Older Adults

ERIC Educational Resources Information Center

Hong, Song-Iee; Hasche, Leslie; Bowland, Sharon

2009-01-01

Purpose: This study examines the structural relationships between social activities and trajectories of late-life depression. Design and Methods: Latent class analysis was used with a nationally representative sample of older adults (N = 5,294) from the Longitudinal Study on Aging II to classify patterns of social activities. A latent growth curve…

An Examination of the Pathways of Depressive Symptoms and Heavy Drinking from Adolescence to Adulthood

ERIC Educational Resources Information Center

Gustafson, Emily

2011-01-01

This study examined the dynamic interaction of heavy alcohol use and depressive symptoms at three points over a time period of 11 years from adolescence to adulthood using a subset of data from the nationally representative, multi-year, longitudinal data source, the National Longitudinal Study of Adolescent Health (Add Health). Results revealed…

Colorism and Educational Outcomes of Asian Americans: Evidence from the National Longitudinal Study of Adolescent Health

ERIC Educational Resources Information Center

Ryabov, Igor

2016-01-01

Using a nationally representative longitudinal data set, the current study examines the link between colorism and educational attainment of Asian American young adults. Three levels of educational attainment are used as outcomes: high school diploma, some college and a Bachelor's degree or higher. Independent variables include skin tone, ethnic…

Classroom Music Experiences of U.S. Elementary School Children: An Analysis of the Early Childhood Longitudinal Study of 1998-1999

ERIC Educational Resources Information Center

Miksza, Peter; Gault, Brent M.

2014-01-01

The primary purpose of this study was to describe the music experiences elementary school children in the United States receive in the academic classroom setting. The data were drawn from the Early Childhood Longitudinal Study of the Kindergarten Class of 1998-1999 (ECLS-K), a nationally representative study that followed kindergarteners through…

Longitudinal Changes in Anthropometry and Body Composition in University Freshmen

ERIC Educational Resources Information Center

Hootman, Katie C.; Guertin, Kristin A.; Cassano, Patricia A.

2017-01-01

Objective: We investigated predictors of weight gain in college freshmen. Participants: A longitudinal cohort study followed a representative sample of freshmen (N = 264) from 8/2011 to 6/2012. Methods: Repeated measurements of anthropometry, dual-energy X-ray absorptiometry (DXA), physical activity, and diet were collected. We investigated…

Intrinsic Motivation, Perceived Competence and Classroom Engagement as Longitudinal Predictors of Adolescent Reading Achievement

ERIC Educational Resources Information Center

Froiland, John Mark; Oros, Emily

2014-01-01

This study investigated the effects of intrinsic motivation, perceived competence, classroom engagement and extrinsic motivation on reading development among youth. Using a nationally representative sample of students in the US, the researchers followed students longitudinally from fifth to eighth grade. Reading achievement was measured using…

Extracurricular Participation and Academic Outcomes: Testing the Over-Scheduling Hypothesis

ERIC Educational Resources Information Center

Fredricks, Jennifer A.

2012-01-01

There is a growing concern that some youth are overscheduled in extracurricular activities, and that this increasing involvement has negative consequences for youth functioning. This article used data from the Educational Longitudinal Study (ELS: 2002), a nationally representative and ethnically diverse longitudinal sample of American high school…

Preschool: First Findings from the Preschool Follow-Up of the Early Childhood Longitudinal Study, Birth Cohort (ECLS-B). First Look. NCES 2008-025

ERIC Educational Resources Information Center

Chernoff, Jodi Jacobson; Flanagan, Kristin Denton; McPhee, Cameron; Park, Jennifer

2007-01-01

The Early Childhood Longitudinal Study, Birth Cohort (ECLS-B) is designed to provide detailed information on children's development, health, and early learning experiences in the years leading up to entry into school. The ECLS-B is the first nationally representative study within the United States to directly assess children's early mental and…

Racial Gaps in Early Childhood: Socio-Emotional Health, Developmental, and Educational Outcomes among African-American Boys. Report

ERIC Educational Resources Information Center

Aratani, Yumiko; Wight, Vanessa R.; Cooper, Janice L.

2011-01-01

This study uses the Early Childhood Longitudinal Study-Birth Cohort (child-B) data, collected by the National Center for Education Statistics in the U.S. Department of Education. The EC LS-B is a nationally representative longitudinal study of approximately 11,000 children who were born in 2001. The children in the EC LS-B have been followed…

Preschoolers with Disabilities: Characteristics, Services, and Results. Wave 1 Overview Report from the Pre-Elementary Education Longitudinal Study (PEELS). NCSER 2006-3003

ERIC Educational Resources Information Center

Markowitz, Joy; Carlson, Elaine; Frey, William; Riley, Jarnee; Shimshak, Amy; Heinzen, Harriotte; Strohl, Jeff; Klein, Sheri; Hyunshik, Lee

2006-01-01

The Pre-Elementary Education Longitudinal Study, commonly referred to as the PEELS study, is funded by the U.S. Department of Education's National Center for Special Education Research (NCSER). It will follow a nationally representative sample of children with disabilities ages 3-5 for a period of six years. This study is designed to describe the…

An INAR(1) Negative Multinomial Regression Model for Longitudinal Count Data.

ERIC Educational Resources Information Center

Bockenholt, Ulf

1999-01-01

Discusses a regression model for the analysis of longitudinal count data in a panel study by adapting an integer-valued first-order autoregressive (INAR(1)) Poisson process to represent time-dependent correlation between counts. Derives a new negative multinomial distribution by combining INAR(1) representation with a random effects approach.…

Longitudinal Surveys of Australian Youth (LSAY): 1995 Cohort: User Guide. Technical Report 49

ERIC Educational Resources Information Center

National Centre for Vocational Education Research (NCVER), 2009

2009-01-01

The Longitudinal Surveys of Australian Youth (LSAY) is a research program that tracks young people as they move from school into further study, work and other destinations. It uses large, nationally representative samples of young people to collect information about education and training, work, and social development. It includes surveys…

Assessing Change in Latent Skills across Time with Longitudinal Cognitive Diagnosis Modeling: An Evaluation of Model Performance

ERIC Educational Resources Information Center

Kaya, Yasemin; Leite, Walter L.

2017-01-01

Cognitive diagnosis models are diagnostic models used to classify respondents into homogenous groups based on multiple categorical latent variables representing the measured cognitive attributes. This study aims to present longitudinal models for cognitive diagnosis modeling, which can be applied to repeated measurements in order to monitor…

Before and after Third Grade: Longitudinal Evidence for the Shifting Role of Socioeconomic Status in Reading Growth

ERIC Educational Resources Information Center

Kieffer, Michael J.

2012-01-01

Using longitudinal data on a nationally representative U.S. cohort, this study investigated the relationship between socioeconomic status and students' reading growth between kindergarten and eighth grade. Piecewise latent growth modeling was used to describe nonlinear growth trajectories in reading during three developmental periods: kindergarten…

Early Oral Language and Later Reading Development in Spanish-Speaking English Language Learners: Evidence from a Nine-Year Longitudinal Study

ERIC Educational Resources Information Center

Kieffer, Michael J.

2012-01-01

Using nationally-representative, longitudinal data on a cohort of Spanish-speaking English language learners in the U.S., this study investigated the extent to which early oral language proficiency in Spanish and English predicts later levels and rates of growth in English reading. Latent growth models indicated that both Spanish and English…

Disentangling the Relationship between Child Maltreatment and Violent Delinquency: Using a Nationally Representative Sample

ERIC Educational Resources Information Center

Yun, Ilhong; Ball, Jeremy D.; Lim, Hyeyoung

2011-01-01

This study uses the National Longitudinal Study of Adolescents (Add Health) data, a nationally representative sample of adolescents, to disentangle the relationship between child maltreatment and violent delinquency. Also examined are potential moderating effects of gender, socioeconomic status (SES), and religiosity on the association between…

Longitudinal Predictors of Homelessness: Findings from the National Longitudinal Survey of Youth-97

PubMed Central

Sznajder-Murray, Brittany; Jang, Joy Bohyun; Slesnick, Natasha; Snyder, Anastasia

2016-01-01

Homeless youth represent a vulnerable and understudied population. Little research has prospectively identified factors that may place youth at risk for experiencing homelessness. The current study utilizes data from the National Longitudinal Survey of Youth-97 (NLSY-97) to examine predictors of experiencing homelessness as a young adult (before age 25). The NLSY-97 includes a nationally representative sample of 8,984 youth. Data were first collected from these youth when they were between the ages of 12 to 18 years. The current study examined whether individual and family risk factors reported during adolescence predict homelessness by the age of 25. The findings showed that multiple runaway episodes, non-traditional family structure, lower educational attainment, and parental work limitations due to health increased the risk of homelessness. A permissive parenting style and being Hispanic protected against homelessness. This study offers unique insight into risk and protective factors for youth homelessness, and has important clinical implications. PMID:27774034

[Change settings for visual analyzer of child users of mobile communication: longitudinal study].

PubMed

Khorseva, N I; Grigor'ev, Iu G; Gorbunova, N V

2014-01-01

The paper represents theresults of longitudinal monitoring of the changes in the parameters of simple visual-motor reaction, the visual acuity and the rate of the visual discrimination in the child users of mobile communication, which indicate the multivariability of the possible effects of radiation from mobile phones on the auditory system of children.

Pets and Human Health in Germany and Australia: National Longitudinal Results

ERIC Educational Resources Information Center

Headey, Bruce; Grabka, Markus M.

2007-01-01

The German and Australian "longitudinal" surveys analysed here are the first national representative surveys to show that (1) people who continuously own a pet are the healthiest group and (2) people who cease to have a pet or never had one are less healthy. Most previous studies which have claimed that pets confer health benefits were…

High School Longitudinal Study of 2009 (HSLS:09). 2013 Update and High School Transcript Study: A First Look at Fall 2009 Ninth-Graders in 2013. NCES 2015-037rev

ERIC Educational Resources Information Center

Dalton, Ben; Ingels, Steven J.; Fritch, Laura

2016-01-01

This report provides a first look at selected findings from 1) the 2013 Update and 2) the High School Transcript Study of the High School Longitudinal Study of 2009 (HSLS:09). HSLS:09 is a nationally representative study of a cohort of students who were ninth-graders in fall 2009. The study focuses on understanding students' trajectories from the…

The Education and Work Plans of Public High School Students. Data Point. NCES 2017-005

ERIC Educational Resources Information Center

Oymak, Ceylan

2017-01-01

This report uses data from the High School Longitudinal Study of 2009 (HSLS:09). HSLS:09 is a nationally representative, longitudinal study of more than 23,000 students who were first surveyed in fall 2009, when they were in the ninth grade, and then again in spring 2012, when most were in the eleventh grade. Students who had been held back and…

Eighth Grade: First Findings from the Final Round of the Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K). First Look. NCES 2008-088

ERIC Educational Resources Information Center

Walston, Jill; Rathbun, Amy; Hausken, Elvira Germino

2008-01-01

This report uses data from the Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K) to describe the middle school experiences of the cohort. The ECLS-K followed the educational, socioemotional, and physical development of a nationally representative sample of kindergartners in public and private schools in the United States…

Education Longitudinal Study of 2002 (ELS:2002): A First Look at 2002 High School Sophomores 10 Years Later. First Look. NCES 2014-363

ERIC Educational Resources Information Center

Lauff, Erich; Ingels, Steven J.

2014-01-01

The Education Longitudinal Study of 2002 (ELS:2002) tracks the educational and developmental experiences of a nationally representative sample of high school sophomores in the United States. This First Look report provides a descriptive portrait of these 2002 tenth-graders a decade later, when most were about 26 years old and had been out of high…

Findings from the Third-Grade Round of the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11 (ECLS-K:2011): First Look. NCES 2016-094

ERIC Educational Resources Information Center

Mulligan, Gail M.; McCarroll, Jill Carlivati; Flanagan, Kristin Denton; Potter, Daniel

2016-01-01

The Early Childhood Longitudinal Study, Kindergarten Class of 2010-11 (ECLS-K:2011), is collecting information about the early educational experiences of a nationally representative sample of children who were in kindergarten or who were of kindergarten age in ungraded classrooms or schools in the 2010-11 school year. The data collection began in…

Public High School Students' Use of Graduation, Career, or Education Plans. Data Point. NCES 2017-111

ERIC Educational Resources Information Center

Hudson, Lisa

2017-01-01

This report uses data from the High School Longitudinal Study of 2009 (HSLS:09). HSLS:09 is a nationally representative, longitudinal study of more than 23,000 students who were first surveyed in fall 2009, when they were in the ninth grade, and then again in spring 2012, when most were in the eleventh grade. The 2012 administration also included…

Generating qualitative data by design: the Australian Longitudinal Study on Women's Health qualitative data collection.

PubMed

Tavener, Meredith; Chojenta, Catherine; Loxton, Deborah

2016-07-15

Objectives and importance of study: The purpose of this study was to illustrate how qualitative free-text comments, collected within the context of a health survey, represent a rich data source for understanding specific phenomena. Work conducted with data from the Australian Longitudinal Study on Women's Health (ALSWH) was used to demonstrate the breadth and depth of qualitative information that can be collected. The ALSWH has been collecting data on women's health since 1996, and represents a unique opportunity for understanding lived experiences across the lifecourse. A multiple case study design was used to demonstrate the techniques that researchers have used to manage free-text qualitative comments collected by the ALSWH. Eleven projects conducted using free-text comments are discussed according to the method of analysis. These methods include coding (both inductively and deductively), longitudinal analyses and software-based analyses. This work shows that free-text comments are a data resource in their own right, and have the potential to provide rich and valuable information about a wide variety of topics.

Ethnic Variations of Pathways Linking Socioeconomic Status, Parenting, and Preacademic Skills in a Nationally Representative Sample

ERIC Educational Resources Information Center

Iruka, Iheoma U.; Dotterer, Aryn M.; Pungello, Elizabeth P.

2014-01-01

Research Findings: Grounded in the investment model and informed by the integrative theory of the study of minority children, this study used the Early Childhood Longitudinal Study-Birth Cohort data set, a nationally representative sample of young children, to investigate whether the association between socioeconomic status (family income and…

The Intelligence-Religiosity Nexus: A Representative Study of White Adolescent Americans

ERIC Educational Resources Information Center

Nyborg, Helmuth

2009-01-01

The present study examined whether IQ relates systematically to denomination and income within the framework of the "g" nexus, using representative data from the National Longitudinal Study of Youth (NLSY97). Atheists score 1.95 IQ points higher than Agnostics, 3.82 points higher than Liberal persuasions, and 5.89 IQ points higher than…

Relative survival: a useful tool to assess generalisability in longitudinal studies of health in older persons

PubMed Central

2011-01-01

Background Generalisability of longitudinal studies is threatened by issues such as choice of sampling frame, representativeness of the initial sample, and attrition. To determine representativeness, cohorts are often compared with the population of interest at baseline on demographic and health characteristics. This study illustrates the use of relative survival as a tool for assessing generalisability of results from a cohort of older people among whom death is a potential threat to generalisability. Methods The authors used data from the 1921-26 cohort (n = 12,416, aged 70-75 in 1996) of the Australian Longitudinal Study on Women's Health (ALSWH). Vital status was determined by linkage to the National Death Index, and expected deaths were derived using Australian life tables. Relative survival was estimated using observed survival in the cohort divided by expected survival among women of the same age and State or Territory. Results Overall, the ALSWH women showed relative survival 9.5% above the general population. Within States and Territories, the relative survival advantage varied from 6% to 23%. The interval-specific relative survival remained relatively constant over the 12 years (1996-2008) under review, indicating that the survival advantage of the cohort has not diminished over time. Conclusion This study demonstrates that relative survival can be a useful measure of generalisability in a longitudinal study of the health of the general population, particularly when participants are older. PMID:21294918

Longitudinal Links between Spanking and Children's Externalizing Behaviors in a National Sample of White, Black, Hispanic, and Asian American Families

ERIC Educational Resources Information Center

Gershoff, Elizabeth T.; Lansford, Jennifer E.; Sexton, Holly R.; Davis-Kean, Pamela; Sameroff, Arnold J.

2012-01-01

This study examined whether the longitudinal links between mothers' use of spanking and children's externalizing behaviors are moderated by family race/ethnicity, as would be predicted by cultural normativeness theory, once mean differences in frequency of use are controlled. A nationally representative sample of White, Black, Hispanic, and Asian…

Eating Problems and Their Risk Factors: A 7-Year Longitudinal Study of a Population Sample of Norwegian Adolescent Girls

ERIC Educational Resources Information Center

Kansi, Juliska; Wichstrom, Lars; Bergman, Lars R.

2005-01-01

The longitudinal stability of eating problems and their relationships to risk factors were investigated in a representative population sample of 623 Norwegian girls aged 13-14 followed over 7 years (3 time points). Three eating problem symptoms were measured: Restriction, Bulimia-food preoccupation, and Diet, all taken from the 12-item Eating…

The Longitudinal Causal Directionality between Body Image Distress and Self-Esteem among Korean Adolescents: The Moderating Effect of Relationships with Parents

ERIC Educational Resources Information Center

Park, Woochul; Epstein, Norman B.

2013-01-01

This study examined the longitudinal relationship between self-esteem and body image distress, as well as the moderating effect of relationships with parents, among adolescents in Korea, using nationally representative prospective panel data. Regarding causal direction, the findings supported bi-directionality for girls, but for boys the…

High School Longitudinal Study of 2009 (HSLS:09) Second Follow-Up: A First Look at Fall 2009 Ninth-Graders in 2016. NCES 2018-139

ERIC Educational Resources Information Center

Radford, Alexandria Walton; Fritch, Laura Burns; Leu, Katherine; Duprey, Michael

2018-01-01

This report presents selected findings from the second follow-up of the High School Longitudinal Study of 2009 (HSLS:09). HSLS:09 follows a nationally representative sample of students who were ninth-graders in fall 2009 from the beginning of high school into higher education and the workforce. Key research topics for HSLS:09 include secondary to…

The Importance of Longitudinal Studies

NASA Astrophysics Data System (ADS)

Knezek, Patricia

2014-01-01

It has been eight years since the AAS Council unanimously endorsed the document, known as "Equity Now: The Pasadena Recommendations for Gender Equality in Astronomy," in January 2005. This document was the main product of the conference entitled “Women in Astronomy II: Ten Years After” (WIA II), held in June 2003 in Pasadena, CA. One of the key recommendations represented in that document was the need for a longitudinal study of astronomers. It was recognized that in order to understand our own field, how it is evolving, and the impact on individuals, we need to track people over time. I will discuss the fundamental questions that led to the recommendation, and set the stage for the current (ongoing) longitudinal study.

Preparing for Life after High School: The Characteristics and Experiences of Youth in Special Education. Findings from the National Longitudinal Transition Study 2012. Volume 1: Comparisons with Other Youth. Full Report. NCEE 2017-4016

ERIC Educational Resources Information Center

Lipscomb, Stephen; Haimson, Joshua; Liu, Albert Y.; Burghardt, John; Johnson, David R.; Thurlow, Martha L.

2017-01-01

The National Longitudinal Transition Study (NLTS) 2012 is a national study of nearly 13,000 youth with and without an individualized education program (IEP). These students were chosen to represent all students with and without an IEP in the United States in grades 7 through 12 (or secondary ungraded classes). Among the youth with an IEP are…

Preparing for Life after High School: The Characteristics and Experiences of Youth in Special Education. Findings from the National Longitudinal Transition Study 2012. Volume 1: Comparisons with Other Youth. Executive Summary. NCEE 2017-4017

ERIC Educational Resources Information Center

Lipscomb, Stephen; Haimson, Joshua; Liu, Albert Y.; Burghardt, John; Johnson, David R.; Thurlow, Martha L.

2017-01-01

The National Longitudinal Transition Study (NLTS) 2012 is a national study of nearly 13,000 youth with and without an individualized education program (IEP). These students were chosen to represent all students with and without an IEP in the United States in grades 7 through 12 (or secondary ungraded classes). Among the youth with an IEP are…

Psychometric Properties of the Children's Depression Inventory: An Item Response Theory Analysis across Age in a Nonclinical, Longitudinal, Adolescent Sample

ERIC Educational Resources Information Center

Lee, Young-Sun; Krishnan, Anita; Park, Yoon Soo

2012-01-01

The purpose of this study was to investigate psychometric properties of the Children's Depression Inventory within a nonclinical and longitudinal sample (8th and 12th grades). Using the Rasch rating scale, most items represented one dimension. There was adequate separation among items and no overlap between ranges of item difficulties with latent…

Movie Smoking Exposure and Smoking Onset: A Longitudinal Study of Mediation Processes in a Representative Sample of U.S. Adolescents

PubMed Central

Wills, Thomas A.; Sargent, James D.; Stoolmiller, Mike; Gibbons, Frederick X.; Gerrard, Meg

2009-01-01

The authors tested 2 mechanisms for the relation of movie smoking exposure with onset of cigarette smoking in adolescence. Longitudinal data with 8-month follow-up were obtained from a representative sample of 6,522 U.S. adolescents, ages 10–14 years. Structural modeling analysis based on initial nonsmokers, which controlled for 10 covariates associated with movie exposure, showed that viewing more smoking in movies was related to increases in positive expectancies about smoking and increases in affiliation with smoking peers, and these variables were both related to smoking onset. A direct effect of movie exposure on smoking onset was also noted. Mediation findings were replicated across cross-sectional and longitudinal analyses. Tests for gender differences indicated that girls showed larger effects of movie exposure for some variables. Implications for policy and prevention research are discussed. PMID:18540724

Predictors of Suicidal Ideation in Late Childhood and Adolescence: A 5-Year Follow-Up of Two Nationally Representative Cohorts in the Republic of Korea

ERIC Educational Resources Information Center

Park, Sunhee

2013-01-01

This study explores the trajectory of suicidal ideation in childhood and adolescence and identifies its strong predictors. Secondary data obtained from two nationally representative cohorts of South Korean youth were longitudinally analyzed using frequencies, percentages, and discrete time survival analysis. This study revealed an increase in the…

Predicting Posttraumatic Stress Symptoms Longitudinally in a Representative Sample of Hospitalized Injured Adolescents

ERIC Educational Resources Information Center

Zatzick, Douglas F.; Grossman, David C.; Russo, Joan; Pynoos, Robert; Berliner, Lucy; Jurkovich, Gregory; Sabin, Janice A.; Katon, Wayne; Ghesquiere, Angela; McCauley, Elizabeth; Rivara, Frederick P.

2006-01-01

Objective: Adolescents constitute a high-risk population for traumatic physical injury, yet few longitudinal investigations have assessed the development of posttraumatic stress disorder (PTSD) symptoms over time in representative samples. Method: Between July 2002 and August 2003,108 randomly selected injured adolescent patients ages 12 to 18 and…

A Longitudinal Investigation of the Relationship between Posttraumatic Stress Symptoms and Posttraumatic Growth in a Cohort of Israeli Jews and Palestinians during Ongoing Violence

PubMed Central

Hall, Brian J.; Saltzman, Leia Y.; Canetti, Daphna; Hobfoll, Stevan E.

2015-01-01

Objectives Meta-analytic evidence based on cross-sectional investigations between posttraumatic growth (PTG) and posttraumatic stress disorder (PTSD) demonstrates that the two concepts are positively related and that ethnic minorities report greater PTG. Few longitudinal studies have quantified this relationship so the evidence is limited regarding the potential benefit PTG may have on post-traumatic adjustment and whether differences between ethnic groups exist. Methods The current study attempts to fill a substantial gap in the literature by exploring the relationship between PTG and PTSD symptom clusters longitudinally using a nationally representative cohort of 1613 Israelis and Palestinian Citizens of Israel (PCI) interviewed via telephone on three measurement occasions during one year. Latent cross-lagged structural models estimated the relationship between PTG and each PTSD symptom cluster, derived from confirmatory factor analysis, representing latent and statistically invariant PTSD symptom factors, best representing PTSD for both ethnic groups. Results PTG was not associated with less PTSD symptom severity in any of the four PTSD clusters, for Jews and PCI. In contrast, PTSD symptom severity assessed earlier was related to later reported PTG in both groups. Conclusions This study demonstrates that PTSD symptoms contribute to greater reported PTG, but that PTG does not provide a salutatory benefit by reducing symptoms of PTSD. PMID:25910043

Baccalaureate and Beyond: A First Look at the Employment Experiences and Lives of College Graduates, 4 Years On (B&B:08/12). NCES 2014-141

ERIC Educational Resources Information Center

Cataldi, Emily Forrest; Siegel, Peter; Shepherd, Bryan; Cooney, Jennifer

2014-01-01

This report presents initial findings about the employment outcomes of bachelor's degree recipients approximately 4 years after they completed their 2007-08 degrees. These findings are based on data from the second follow-up of the Baccalaureate and Beyond Longitudinal Study (B&B:08/12), a nationally representative longitudinal sample survey…

Subjective Well-Being: The Constructionist Point of View. A Longitudinal Study to Verify the Predictive Power of Top-Down Effects and Bottom-Up Processes

ERIC Educational Resources Information Center

Leonardi, Fabio; Spazzafumo, Liana; Marcellini, Fiorella

2005-01-01

Based on the constructionist point of view applied to Subjective Well-Being (SWB), five hypotheses were advanced about the predictive power of the top-down effects and bottom-up processes over a five years period. The sample consisted of 297 respondents, which represent the Italian sample of a European longitudinal survey; the first phase was…

STATISTICAL GROWTH MODELING OF LONGITUDINAL DT-MRI FOR REGIONAL CHARACTERIZATION OF EARLY BRAIN DEVELOPMENT.

PubMed

Sadeghi, Neda; Prastawa, Marcel; Fletcher, P Thomas; Gilmore, John H; Lin, Weili; Gerig, Guido

2012-01-01

A population growth model that represents the growth trajectories of individual subjects is critical to study and understand neurodevelopment. This paper presents a framework for jointly estimating and modeling individual and population growth trajectories, and determining significant regional differences in growth pattern characteristics applied to longitudinal neuroimaging data. We use non-linear mixed effect modeling where temporal change is modeled by the Gompertz function. The Gompertz function uses intuitive parameters related to delay, rate of change, and expected asymptotic value; all descriptive measures which can answer clinical questions related to growth. Our proposed framework combines nonlinear modeling of individual trajectories, population analysis, and testing for regional differences. We apply this framework to the study of early maturation in white matter regions as measured with diffusion tensor imaging (DTI). Regional differences between anatomical regions of interest that are known to mature differently are analyzed and quantified. Experiments with image data from a large ongoing clinical study show that our framework provides descriptive, quantitative information on growth trajectories that can be directly interpreted by clinicians. To our knowledge, this is the first longitudinal analysis of growth functions to explain the trajectory of early brain maturation as it is represented in DTI.

Setting up an Online Panel Representative of the General Population: The German Internet Panel

ERIC Educational Resources Information Center

Blom, Annelies G.; Gathmann, Christina; Krieger, Ulrich

2015-01-01

This article looks into the processes and outcomes of setting up and maintaining a probability-based longitudinal online survey, which is recruited face-to-face and representative of both the online and the offline population aged 16-75 in Germany. This German Internet Panel studies political and economic attitudes and reform preferences through…

Predictors of Adolescent Health Care Utilization

ERIC Educational Resources Information Center

Vingilis, Evelyn; Wade, Terrance; Seeley, Jane

2007-01-01

This study, using Andersen's health care utilization model, examined how predisposing characteristics, enabling resources, need, personal health practices, and psychological factors influence health care utilization using a nationally representative, longitudinal sample of Canadian adolescents. Second, this study examined whether this process…

Instructor Quality and EMT Certification Examination Results

ERIC Educational Resources Information Center

Russ-Eft, Darlene; Dickison, Phil; Levine, Roger

2007-01-01

The Longitudinal Emergency Medical Technician Attributes and Demographics Study (LEADS) provides a representative sampling of EMTs throughout the United States. This study examines the relationship between instructor quality and National Registry of Emergency Medical Technicians certification examination outcomes. Results show significant…

Risk and Protective Factors Associated with Speech and Language Impairment in a Nationally Representative Sample of 4- to 5-Year-Old Children

ERIC Educational Resources Information Center

Harrison, Linda J.; McLeod, Sharynne

2010-01-01

Purpose: To determine risk and protective factors for speech and language impairment in early childhood. Method: Data are presented for a nationally representative sample of 4,983 children participating in the Longitudinal Study of Australian Children (described in McLeod & Harrison, 2009). Thirty-one child, parent, family, and community…

Improving Educational Outcomes for Latinos: A Study of the Interactive Policy Effects of Representative Bureaucracy and Personnel Stability

ERIC Educational Resources Information Center

Morton, Tabitha S. M.

2015-01-01

This article seeks to determine whether 2 common management strategies, representative bureaucracy and personnel stability, can be used in combination with each other in order to improve educational policy outcomes for Latinos. Using data from Texas school districts from 1994 to 2010 and a cross-sectional longitudinal research design, I find that…

Use of Longitudinal Regression in Quality Control. Research Report. ETS RR-14-31

ERIC Educational Resources Information Center

Lu, Ying; Yen, Wendy M.

2014-01-01

This article explores the use of longitudinal regression as a tool for identifying scoring inaccuracies. Student progression patterns, as evaluated through longitudinal regressions, typically are more stable from year to year than are scale score distributions and statistics, which require representative samples to conduct credibility checks.…

New trends in gender and mathematics performance: a meta-analysis.

PubMed

Lindberg, Sara M; Hyde, Janet Shibley; Petersen, Jennifer L; Linn, Marcia C

2010-11-01

In this article, we use meta-analysis to analyze gender differences in recent studies of mathematics performance. First, we meta-analyzed data from 242 studies published between 1990 and 2007, representing the testing of 1,286,350 people. Overall, d = 0.05, indicating no gender difference, and variance ratio = 1.08, indicating nearly equal male and female variances. Second, we analyzed data from large data sets based on probability sampling of U.S. adolescents over the past 20 years: the National Longitudinal Surveys of Youth, the National Education Longitudinal Study of 1988, the Longitudinal Study of American Youth, and the National Assessment of Educational Progress. Effect sizes for the gender difference ranged between -0.15 and +0.22. Variance ratios ranged from 0.88 to 1.34. Taken together, these findings support the view that males and females perform similarly in mathematics.

The effects of cumulative risks and promotive factors on urban adolescent alcohol and other drug use: a longitudinal study of resiliency.

PubMed

Ostaszewski, Krzysztof; Zimmerman, Marc A

2006-12-01

Resiliency theory provides a conceptual framework for studying why some youth exposed to risk factors do not develop the negative behaviors they predict. The purpose of this study was to test compensatory and protective models of resiliency in a longitudinal sample of urban adolescents (80% African American). The data were from Years 1 (9th grade) and 4 (12th grade). The study examined effects of cumulative risk and promotive factors on adolescent polydrug use including alcohol, tobacco and marijuana. Cumulative measures of risk/promotive factors represented individual characteristics, peer influence, and parental/familial influences. After controlling for demographics, results of multiple regression of polydrug use support the compensatory model of resiliency both cross-sectionally and longitudinally. Promotive factors were also found to have compensatory effects on change in adolescent polydrug use. The protective model of resiliency evidenced cross-sectionally was not supported in longitudinal analysis. The findings support resiliency theory and the use of cumulative risk/promotive measures in resiliency research. Implications focused on utilizing multiple assets and resources in prevention programming are discussed.

Children's Moral Motivation, Sympathy, and Prosocial Behavior

ERIC Educational Resources Information Center

Malti, Tina; Gummerum, Michaela; Keller, Monika; Buchmann, Marlis

2009-01-01

Two studies investigated the role of children's moral motivation and sympathy in prosocial behavior. Study 1 measured other-reported prosocial behavior and self- and other-reported sympathy. Moral motivation was assessed by emotion attributions and moral reasoning following hypothetical transgressions in a representative longitudinal sample of…

Motion simulator study of longitudinal stability requirements for large delta wing transport airplanes during approach and landing with stability augmentation systems failed

NASA Technical Reports Server (NTRS)

Snyder, C. T.; Fry, E. B.; Drinkwater, F. J., III; Forrest, R. D.; Scott, B. C.; Benefield, T. D.

1972-01-01

A ground-based simulator investigation was conducted in preparation for and correlation with an-flight simulator program. The objective of these studies was to define minimum acceptable levels of static longitudinal stability for landing approach following stability augmentation systems failures. The airworthiness authorities are presently attempting to establish the requirements for civil transports with only the backup flight control system operating. Using a baseline configuration representative of a large delta wing transport, 20 different configurations, many representing negative static margins, were assessed by three research test pilots in 33 hours of piloted operation. Verification of the baseline model to be used in the TIFS experiment was provided by computed and piloted comparisons with a well-validated reference airplane simulation. Pilot comments and ratings are included, as well as preliminary tracking performance and workload data.

IN UTERO ENVIRONMENTAL EXPOSURES IN THE NATIONAL CHILDREN'S STUDY - MEASUREMENT STRATEGIES

EPA Science Inventory

The National Children¿s Study (NCS) is a longitudinal cohort study which is designed to follow a nationally representative sample of American children from prior to conception or early pregnancy until age 21 years. The Children's Health Act of 2000 directs a consortium of United...

Participation in Power Sports and Antisocial Involvement in Preadolescent and Adolescent Boys

ERIC Educational Resources Information Center

Endresen, Inger M.; Olweus, Dan

2005-01-01

Background: A limited number of mostly cross-sectional studies have examined the possible effects of power sports on aggressive and antisocial involvement in children and youth. The majority of these studies have serious methodological limitations, and results are partly contradictory. Longitudinal studies with representative, reasonably large…

Detection of a novel, integrative aging process suggests complex physiological integration.

PubMed

Cohen, Alan A; Milot, Emmanuel; Li, Qing; Bergeron, Patrick; Poirier, Roxane; Dusseault-Bélanger, Francis; Fülöp, Tamàs; Leroux, Maxime; Legault, Véronique; Metter, E Jeffrey; Fried, Linda P; Ferrucci, Luigi

2015-01-01

Many studies of aging examine biomarkers one at a time, but complex systems theory and network theory suggest that interpretations of individual markers may be context-dependent. Here, we attempted to detect underlying processes governing the levels of many biomarkers simultaneously by applying principal components analysis to 43 common clinical biomarkers measured longitudinally in 3694 humans from three longitudinal cohort studies on two continents (Women's Health and Aging I & II, InCHIANTI, and the Baltimore Longitudinal Study on Aging). The first axis was associated with anemia, inflammation, and low levels of calcium and albumin. The axis structure was precisely reproduced in all three populations and in all demographic sub-populations (by sex, race, etc.); we call the process represented by the axis "integrated albunemia." Integrated albunemia increases and accelerates with age in all populations, and predicts mortality and frailty--but not chronic disease--even after controlling for age. This suggests a role in the aging process, though causality is not yet clear. Integrated albunemia behaves more stably across populations than its component biomarkers, and thus appears to represent a higher-order physiological process emerging from the structure of underlying regulatory networks. If this is correct, detection of this process has substantial implications for physiological organization more generally.

SU-F-J-55: Feasibility of Supraclavicular Field Treatment by Investigating Variation of Junction Position Between Breast Tangential and Supraclavicular Fields for Deep Inspiration Breath Hold (DIBH) Left Breast Radiation

DOE Office of Scientific and Technical Information (OSTI.GOV)

Zhao, H; Sarkar, V; Paxton, A

Purpose: To explore the feasibility of supraclavicular field treatment by investigating the variation of junction position between tangential and supraclavicular fields during left breast radiation using DIBH technique. Methods: Six patients with left breast cancer treated using DIBH technique were included in this study. AlignRT system was used to track patient’s breast surface. During daily treatment, when the patient’s DIBH reached preset AlignRT tolerance of ±3mm for all principle directions (vertical, longitudinal, and lateral), the remaining longitudinal offset was recorded. The average with standard-deviation and the range of daily longitudinal offset for the entire treatment course were calculated for allmore » six patients (93 fractions totally). The ranges of average ± 1σ and 2σ were calculated, and they represent longitudinal field edge error with the confidence level of 68% and 95%. Based on these longitudinal errors, dose at junction between breast tangential and supraclavicular fields with variable gap/overlap sizes was calculated as a percentage of prescription (on a representative patient treatment plan). Results: The average of longitudinal offset for all patients is 0.16±1.32mm, and the range of longitudinal offset is −2.6 to 2.6mm. The range of longitudinal field edge error at 68% confidence level is −1.48 to 1.16mm, and at 95% confidence level is −2.80 to 2.48mm. With a 5mm and 1mm gap, the junction dose could be as low as 37.5% and 84.9% of prescription dose; with a 5mm and 1mm overlap, the junction dose could be as high as 169.3% and 117.6%. Conclusion: We observed longitudinal field edge error at 95% confidence level is about ±2.5mm, and the junction dose could reach 70% hot/cold between different DIBH. However, over the entire course of treatment, the average junction variation for all patients is within 0.2mm. The results from our study shows it is potentially feasible to treat supraclavicular field with breast tangents.« less

Dimensions of integration, continuity and longitudinality in clinical clerkships.

PubMed

Ellaway, Rachel H; Graves, Lisa; Cummings, Beth-Ann

2016-09-01

Over the past few decades, longitudinal integrated clerkships (LICs) have been proposed to address many perceived short-coming of traditional block clerkships. This growing interest in LICs has raised broader questions regarding the role of integration, continuity and longitudinality in medical education. A study with complementary theoretical and empirical dimensions was conducted to derive a more precise way of defining these three underlying concepts within the design of medical education curricula. The theoretical dimension involved a thematic review of the literature on integration, continuity and longitudinality in medical education. The empirical dimension surveyed all 17 Canadian medical schools on how they have operationalised integration, continuity and longitudinality in their undergraduate programmes. The two dimensions were iteratively synthesised to explore the meaning and expression of integration, continuity and longitudinality in medical education curriculum design. Integration, continuity and longitudinality were expressed in many ways and forms, including: integration of clinical disciplines, combined horizontal integration and vertical integration, and programme-level integration. Types of continuity included: continuity of patients, continuity of teaching, continuity of location and peer continuity. Longitudinality focused on connected or repeating episodes of training or on connecting activities, such as encounter logging across educational episodes. Twelve of the 17 schools were running an LIC of some kind, although only one school had a mandatory LIC experience. An ordinal scale of uses of integration, continuity and longitudinality during clerkships was developed, and new definitions of these concepts in the clerkship context were generated. Different clerkship designs embodied different forms and levels of integration, continuity and longitudinality. A dichotomous view of LICs and rotation-based clerkships was found not to represent current practices in Canada, which instead tended to fall along a continuum of integration, continuity and longitudinality. © 2016 John Wiley & Sons Ltd and The Association for the Study of Medical Education.

Physical growth and cognitive skills in early-life: evidence from a nationally representative US birth cohort.

PubMed

Murasko, Jason E

2013-11-01

This paper establishes associations between length/height and cognitive skills in infancy, toddlerhood, and school-entry. The data come from the Early Childhood Longitudinal Study--Birth Cohort (ECLS-B), a representative longitudinal sample of US children born in 2001. A positive association between length/height and cognition is found as early as 9 months and continues through school-entry. These associations are robust to controls for birthweight and economic status. Early growth is also shown to be a stronger predictor of reading and math skills in kindergarten than attained height. Girls exhibit stronger evidence of this latter result than boys. These findings have implications for the interpretation of early life as a critical period for the growth-cognition relationship. Copyright © 2012 Elsevier Ltd. All rights reserved.

Longitudinal experiences of children remaining at home after a first-time investigation for suspected maltreatment

PubMed Central

Campbell, Kristine A.; Thomas, Andrea M.; Cook, Lawrence J.; Keenan, Heather T.

2012-01-01

Objective To describe longitudinal change in risk for children remaining at home following a first-time investigation for suspected maltreatment. Study design A retrospective cohort study of children remaining at home following first-time investigation for maltreatment using a nationally representative sample of households involved with Child Protective Services (CPS). Outcomes include poverty, social support, caregiver depression, intimate partner violence (IPV), drug/alcohol dependence, corporal punishment, and child behavior problems at baseline, 18, and 36 months following first-time CPS investigation. We present longitudinal models to 1) estimate prevalence of risk factors at each timepoint and 2) examine associations between risk-specific service referrals and longitudinal change in risk factor prevalence. Results Our sample represented 1,057,056 U.S. children remaining at home following first-time investigation for maltreatment. Almost 100,000 (9.2%) children experienced out-of-home placement within 36 months. The prevalence of poverty (44.3%), poor social support (36.3%), caregiver depression (24.4%), IPV (22.1%), and internalizing (30.0%) and externalizing (35.8%) child behavior problems was above general population prevalence at baseline and remained high over the next 36 months. Referral to risk-specific services occurred in a minority of cases, but was associated with significant longitudinal reductions in IPV, drug/alcohol dependence, and externalizing child behavior problems. Conclusions Children remaining at home following a first-time investigation for maltreatment live with persistent risk factors for repeat maltreatment. Appropriate service referrals are uncommon, but may be associated with meaningful reduction in risk over time. Pediatricians and policy makers may be able to improve outcomes in these families with appropriate service provision and referrals. PMID:22480699

Longitudinal Study of Body Mass Index in Young Males and the Transition to Fatherhood

PubMed Central

Garfield, Craig F.; Duncan, Greg; Gutina, Anna; Rutsohn, Joshua; McDade, Thomas W.; Adam, Emma K.; Coley, Rebekah Levine; Chase-Lansdale, P. Lindsay

2017-01-01

Despite a growing understanding that the social determinants of health have an impact on body mass index (BMI), the role of fatherhood on young men’s BMI is understudied. This longitudinal study examines BMI in young men over time as they transition from adolescence into fatherhood in a nationally representative sample. Data from all four waves of the National Longitudinal Study of Adolescent Health supported a 20-year longitudinal analysis of 10,253 men beginning in 1994. A “fatherhood-year” data set was created and changes in BMI were examined based on fatherhood status (nonfather, nonresident father, resident father), fatherhood years, and covariates. Though age is positively associated with BMI over all years for all men, comparing nonresident and resident fathers with nonfathers reveals different trajectories based on fatherhood status. Entrance into fatherhood is associated with an increase in BMI trajectory for both nonresident and resident fathers, while nonfathers exhibit a decrease over the same period. In this longitudinal, population-based study, fatherhood and residence status play a role in men’s BMI. Designing obesity prevention interventions for young men that begin in adolescence and carry through young adulthood should target the distinctive needs of these populations, potentially improving their health outcomes. PMID:26198724

The Changing Workforce. Highlights of the National Study, No. 1.

ERIC Educational Resources Information Center

Galinsky, Ellen; And Others

This report presents results of a nationally representative longitudinal study of nearly 3,400 workers. The study investigated the work and personal/family lives of workers, particularly with respect to recent rapid changes in the economy, layoffs, and downsizing. The study was conducted through a series of hour-long phone interviews. The study…

Programs and Practices that Retain Students from the First to Second Year: Results from a National Study

ERIC Educational Resources Information Center

DeAngelo, Linda

2014-01-01

In this chapter findings from a nationally representative longitudinal study offer insights into how the experiences students have during their first college year affect their intention to be retained at their initial college for the second year.

A Longitudinal Twin Study on the Association between Inattentive and Hyperactive-Impulsive ADHD Symptoms

ERIC Educational Resources Information Center

Greven, Corina U.; Asherson, Philip; Rijsdijk, Fruhling V.; Plomin, Robert

2011-01-01

DSM-IV distinguishes two symptom domains of attention deficit hyperactivity disorder (ADHD): inattentiveness and hyperactivity-impulsivity. The present study examines the aetiologies and developmental relations underlying the associations between inattentiveness and hyperactivity-impulsivity over time, based on a representative population sample…

Cohort profile: the Motorik-Modul Longitudinal Study: physical fitness and physical activity as determinants of health development in German children and adolescents.

PubMed

Wagner, Matthias O; Bös, Klaus; Jekauc, Darko; Karger, Claudia; Mewes, Nadine; Oberger, Jennifer; Reimers, Anne K; Schlenker, Lars; Worth, Annette; Woll, Alexander

2014-10-01

The Motorik-Modul (MoMo) Longitudinal Study aims to contribute to long-term improvement in the health of German children and adolescents by focusing on: (i) the development of physical fitness and physical activity (including period effects); (ii) the individual and physical/social environmental determinants of the development of physical fitness and physical activity; and (iii) the impact of physical fitness and physical activity on the development of physical and mental health. The MoMo Longitudinal Study began with a nationwide representative sample of 4529 children and adolescents who ranged in age from 4-17 years at the study baseline (2003-2006). The first survey wave of the MoMo Longitudinal Study was conducted between 2009 and 2012, with two subsequent survey waves to be conducted between 2014 and 2016 and 2018 and 2020, respectively. The MoMo Longitudinal Study includes a physical fitness test profile, a physical activity questionnaire, and subjective and objective measures of health from the German Health Interview and Examination Survey (KiGGS). Data access is provided on request (alexander.woll@kit.edu). For further information, including a complete list of publications please visit www.motorik-modul.de. Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2013; all rights reserved.

Maternal depressive symptoms across early childhood and asthma in school children: findings from a Longitudinal Australian Population Based Study.

PubMed

Giallo, Rebecca; Bahreinian, Salma; Brown, Stephanie; Cooklin, Amanda; Kingston, Dawn; Kozyrskyj, Anita

2015-01-01

There is a growing body of evidence attesting to links between early life exposure to stress and childhood asthma. However, available evidence is largely based on small, genetically high risk samples. The aim of this study was to explore the associations between the course of maternal depressive symptoms across early childhood and childhood asthma in a nationally representative longitudinal cohort study of Australian children. Participants were 4164 children and their biological mothers from the Longitudinal Study of Australian Children. Latent class analysis identified three trajectories of maternal depressive symptoms across four biennial waves from the first postnatal year to when children were 6-7 years: minimal symptoms (74.6%), sub-clinical symptoms (20.8%), and persistent and increasing high symptoms (4.6%). Logistic regression analyses revealed that childhood asthma at age 6-7 years was associated with persistent and increasing high depressive symptoms after accounting for known risk factors including smoking during pregnancy and maternal history of asthma (adjusted OR 2.36, 95% CI 1.61-3.45), p.001). Our findings from a nationally representative sample of Australian children provide empirical support for a relationship between maternal depressive symptoms across the early childhood period and childhood asthma. The burden of disease from childhood asthma may be reduced by strengthening efforts to promote maternal mental health in the early years of parenting.

Maternal Alcohol Consumption during Pregnancy and Infant Social, Mental, and Motor Development

ERIC Educational Resources Information Center

Brown, Carole Williams; Olson, Heather Carmichael; Croninger, Robert G.

2010-01-01

Maternal alcohol consumption during pregnancy is a significant social problem associated with developmental difficulties in young children. Child developmental and behavioral characteristics were examined from the 9-month data point of the Early Childhood Longitudinal Studies-Birth Cohort, a prospective nationally representative study. Several…

Arguments at Mealtime and Child Energy Intake

ERIC Educational Resources Information Center

Burnier, Daniel; Dubois, Lise; Girard, Manon

2011-01-01

Objective: To examine how arguments at mealtimes relate to children's daily energy intake. Design: A cross-sectional study using data obtained through the Quebec Longitudinal Study of Child Development 1998-2010 (QLSCD), a representative sample of children born in 1998, in the province of Quebec, Canada. Setting: Face-to-face interviews,…

Instructor Quality Affecting Emergency Medical Technician (EMT) Preparedness: A LEADS Project

ERIC Educational Resources Information Center

Russ-Eft, Darlene F.; Dickison, Philip D.; Levine, Roger

2005-01-01

This represents one of a series of studies of the Longitudinal Emergency Medical Technician Attributes and Demographics Study (LEADS) being undertaken by the National Registry of Emergency Medical Technicians and the National Highway Traffic Safety Administration (NHTSA). This secondary analysis of the LEADS database, which provides a…

RECRUITING FOR A LONGITUDINAL STUDY OF CHILDREN'S HEALTH USING A HOUSEHOLD-BASED PROBABILITY SAMPLING APPROACH

EPA Science Inventory

The sampling design for the National Children¿s Study (NCS) calls for a population-based, multi-stage, clustered household sampling approach (visit our website for more information on the NCS : www.nationalchildrensstudy.gov). The full sample is designed to be representative of ...

Drinking, Socioemotional Functioning, and Academic Progress in Secondary School

ERIC Educational Resources Information Center

Crosnoe, Robert; Benner, Aprile D.; Schneider, Barbara

2012-01-01

Secondary schools are sites of academic instruction but also contexts of socioemotional development, and the intertwining of these two functions has consequences for adolescents' future health and education. Drawing on nationally representative data from the National Longitudinal Study of Adolescent Health (n = 8,271), this study explored the…

A National Look at Children and Families Entering Early Intervention

ERIC Educational Resources Information Center

Scarborough, Anita A.; Spiker, Donna; Mallik, Sangeeta; Hebbeler, Kathleen M.; Bailey Jr., Donald B.; Simeonsson, Rune J.

2004-01-01

The National Early Intervention Longitudinal Study (NEILS) is the first study of Part C of the Individuals With Disabilities Education Act (IDEA) early intervention system with a nationally representative sample of infants and toddlers with disabilities. This article presents national estimates of characteristics of infants and toddlers and their…

Taking the Pulse of Training Transfer: Instructor Quality and EMT Certification Examination Results

ERIC Educational Resources Information Center

Russ-Eft, Darlene F.; Dickison, Phil; Levine, Roger

2010-01-01

The Longitudinal Emergency Medical Technician Attributes and Demographics Study (LEADS) provides a representative sampling of EMTs throughout the United States. The present study adds to the transfer of training literature by examining the relationship between instructor quality and National Registry of Emergency Medical Technicians certification…

School-Based Kindergarten Transition Practices and Child Outcomes: Revisiting the Issue

ERIC Educational Resources Information Center

Little, Michael H.

2017-01-01

The purpose of this study was to examine the relationship between school-based kindergarten transition practices and student achievement and executive functioning using recent, nationally representative data from the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11. The analysis employed 3-level hierarchical linear models and…

Academic Performance of Community College Transfers: Psychological, Sociodemographic, and Educational Correlates

ERIC Educational Resources Information Center

Wang, Xueli

2012-01-01

This study focuses on the academic performance of community college transfer students at four-year institutions. It uses a nationally representative sample from the National Education Longitudinal Study of 1988 (NELS: 88/2000) and the Postsecondary Education Transcript Study (PETS). Results from an Ordinary Least Squares regression model suggest…

Living with a Grandparent and Parent in Early Childhood: Associations with School Readiness and Differences by Demographic Characteristics

ERIC Educational Resources Information Center

Pilkauskas, Natasha V.

2014-01-01

Despite the increasing prevalence of 3-generation family households (grandparent, parent, child), relatively little research has studied these households during early childhood. Using nationally representative data from the Early Childhood Longitudinal Study--Birth Cohort ("N" = ~6,550), this study investigated the associations between…

Religion and body weight: a review of quantitative studies.

PubMed

Yeary, Karen Hye-Cheon Kim; Sobal, Jeffery; Wethington, Elaine

2017-10-01

Increasing interest in relationships between religion and health has encouraged research about religion and body weight, which has produced mixed findings. We systematically searched 11 bibliographic databases for quantitative studies of religion and weight, locating and coding 85 studies. We conducted a systematic review, analysing descriptive characteristics of the studies as well as relevant religion-body weight associations related to study characteristics. We summarized findings for two categories of religion variables: religious affiliation and religiosity. For religious affiliation, we found evidence for significant associations with body weight in both cross-sectional and longitudinal studies. In particular, Seventh-Day Adventists had lower body weight than other denominations in cross-sectional analyses. For religiosity, significant associations occurred between greater religiosity and higher body weight in both cross-sectional and longitudinal studies. In particular, greater religiosity was significantly associated with higher body weight in bivariate analyses but less so in multivariate analyses. A greater proportion of studies that used a representative sample, longitudinal analyses, and samples with only men reported significant associations between religiosity and weight. Evidence in seven studies suggested that health behaviours and psychosocial factors mediate religion-weight relationships. More longitudinal studies and analyses of mediators are needed to provide stronger evidence and further elucidate religion-weight relationships. © 2017 World Obesity Federation.

The natural course of anxiety disorders in the elderly: a systematic review of longitudinal trials.

PubMed

Sami, Musa Basseer; Nilforooshan, Ramin

2015-07-01

The anxiety disorders are a prevalent mental health problem in older age with a considerable impact on quality of life. Until recently there have been few longitudinal studies on anxiety in this age group, consequently most of the evidence to date has been cross-sectional in nature. We undertook a literature search of Medline, PsycINFO, the Cochrane trials database and the TRIP medical database to identify longitudinal studies which would help elucidate natural history and prognosis of anxiety disorders in the elderly. We identified 12 papers of 10 longitudinal studies in our Review. This represented 34,691 older age participants with 5,199 with anxiety disorders including anxious depression and 3,532 individuals with depression without anxiety. Relapse rates of anxiety disorders are high over 6 year follow-up with considerable migration to mixed anxiety-depression and pure depressive mood episodes. Mixed anxiety-depression appears to be a poorer prognostic state than pure anxiety or pure depression with higher relapse rates across studies. In community settings treatment rates are low with 7-44% of the anxious elderly treated on antidepressant medications. To our knowledge this is the first Systematic Review of longitudinal trials of anxiety disorders in older people. Major longitudinal studies of the anxious elderly are establishing the high risk of relapse and persistence alongside the progression to depression and anxiety depression states. There remains considerable under-treatment in community studies. Specialist assessment and treatment and major public health awareness of the challenges of anxiety disorders in the elderly are required.

Genetic and Environmental Transactions Underlying Educational Attainment

ERIC Educational Resources Information Center

Johnson, Wendy; Deary, Ian J.; Iacono, William G.

2009-01-01

This report used a population-representative longitudinal twin study with two birth cohorts to explore the association between intelligence and education by understanding how genetic and environmental influences on intelligence moderate genetic and environmental influences on school grades and educational attainment. Nonshared environmental…

Structure and Correlates of Cognitive Aging in a Narrow Age Cohort

PubMed Central

2014-01-01

Aging-related changes occur for multiple domains of cognitive functioning. An accumulating body of research indicates that, rather than representing statistically independent phenomena, aging-related cognitive changes are moderately to strongly correlated across domains. However, previous studies have typically been conducted in age-heterogeneous samples over longitudinal time lags of 6 or more years, and have failed to consider whether results are robust to a comprehensive set of controls. Capitalizing on 3-year longitudinal data from the Lothian Birth Cohort of 1936, we took a longitudinal narrow age cohort approach to examine cross-domain cognitive change interrelations from ages 70 to 73 years. We fit multivariate latent difference score models to factors representing visuospatial ability, processing speed, memory, and crystallized ability. Changes were moderately interrelated, with a general factor of change accounting for 47% of the variance in changes across domains. Change interrelations persisted at close to full strength after controlling for a comprehensive set of demographic, physical, and medical factors including educational attainment, childhood intelligence, physical function, APOE genotype, smoking status, diagnosis of hypertension, diagnosis of cardiovascular disease, and diagnosis of diabetes. Thus, the positive manifold of aging-related cognitive changes is highly robust in that it can be detected in a narrow age cohort followed over a relatively brief longitudinal period, and persists even after controlling for many potential confounders. PMID:24955992

Structure and correlates of cognitive aging in a narrow age cohort.

PubMed

Tucker-Drob, Elliot M; Briley, Daniel A; Starr, John M; Deary, Ian J

2014-06-01

Aging-related changes occur for multiple domains of cognitive functioning. An accumulating body of research indicates that, rather than representing statistically independent phenomena, aging-related cognitive changes are moderately to strongly correlated across domains. However, previous studies have typically been conducted in age-heterogeneous samples over longitudinal time lags of 6 or more years, and have failed to consider whether results are robust to a comprehensive set of controls. Capitalizing on 3-year longitudinal data from the Lothian Birth Cohort of 1936, we took a longitudinal narrow age cohort approach to examine cross-domain cognitive change interrelations from ages 70 to 73 years. We fit multivariate latent difference score models to factors representing visuospatial ability, processing speed, memory, and crystallized ability. Changes were moderately interrelated, with a general factor of change accounting for 47% of the variance in changes across domains. Change interrelations persisted at close to full strength after controlling for a comprehensive set of demographic, physical, and medical factors including educational attainment, childhood intelligence, physical function, APOE genotype, smoking status, diagnosis of hypertension, diagnosis of cardiovascular disease, and diagnosis of diabetes. Thus, the positive manifold of aging-related cognitive changes is highly robust in that it can be detected in a narrow age cohort followed over a relatively brief longitudinal period, and persists even after controlling for many potential confounders. PsycINFO Database Record (c) 2014 APA, all rights reserved.

Family and housing instability: Longitudinal impact on adolescent emotional and behavioral well-being.

PubMed

Fowler, Patrick J; Henry, David B; Marcal, Katherine E

2015-09-01

This study investigated the longitudinal effects of family structure changes and housing instability in adolescence on functioning in the transition to adulthood. A model examined the influence of household composition changes and mobility in context of ethnic differences and sociodemographic risks. Data from the National Longitudinal Study of Adolescent Health measured household and residential changes over a 12-month period among a nationally representative sample of adolescents. Assessments in young adulthood measured rates of depression, criminal activity, and smoking. Findings suggested housing mobility in adolescence predicted poorer functioning across outcomes in young adulthood, and youth living in multigenerational homes exhibited greater likelihood to be arrested than adolescents in single-generation homes. However, neither family structure changes nor its interaction with residential instability or ethnicity related to young adult outcomes. Findings emphasized the unique influence of housing mobility in the context of dynamic household compositions. Copyright © 2015 Elsevier Inc. All rights reserved.

Quantifying the impact of the longitudinal dispersion coefficient parameter uncertainty on the physical transport processes in rivers

NASA Astrophysics Data System (ADS)

Camacho Suarez, V. V.; Shucksmith, J.; Schellart, A.

2016-12-01

Analytical and numerical models can be used to represent the advection-dispersion processes governing the transport of pollutants in rivers (Fan et al., 2015; Van Genuchten et al., 2013). Simplifications, assumptions and parameter estimations in these models result in various uncertainties within the modelling process and estimations of pollutant concentrations. In this study, we explore both: 1) the structural uncertainty due to the one dimensional simplification of the Advection Dispersion Equation (ADE) and 2) the parameter uncertainty due to the semi empirical estimation of the longitudinal dispersion coefficient. The relative significance of these uncertainties has not previously been examined. By analysing both the relative structural uncertainty of analytical solutions of the ADE, and the parameter uncertainty due to the longitudinal dispersion coefficient via a Monte Carlo analysis, an evaluation of the dominant uncertainties for a case study in the river Chillan, Chile is presented over a range of spatial scales.

Children's organized physical activity patterns from childhood into adolescence.

PubMed

Findlay, Leanne C; Garner, Rochelle E; Kohen, Dafna E

2009-11-01

Few longitudinal studies of physical activity have included young children or used nationally representative datasets. The purpose of the current study was to explore patterns of organized physical activity for Canadian children aged 4 through 17 years. Data from 5 cycles of the National Longitudinal Survey of Children and Youth were analyzed separately for boys (n = 4463) and girls (n = 4354) using multiple trajectory modeling. Boys' and girls' organized physical activity was best represented by 3 trajectory groups. For boys, these groups were labeled: high stable, high decreasing, and low decreasing participation. For girls, these groups were labeled: high decreasing, moderate stable, and low decreasing participation. Risk factors (parental education, household income, urban/rural dwelling, and single/dual parent) were explored. For boys and girls, having a parent with postsecondary education and living in a higher income household were associated with a greater likelihood of weekly participation in organized physical activity. Living in an urban area was also significantly associated with a greater likelihood of weekly participation for girls. Results suggest that Canadian children's organized physical activity is best represented by multiple patterns of participation that tend to peak in middle childhood and decline into adolescence.

Ethnic disparities in childhood BMI trajectories and obesity and potential causes among 29,250 US children: Findings from the Early Childhood Longitudinal Study-Birth and Kindergarten Cohorts.

PubMed

Min, Jungwon; Wen, Xiaozhong; Xue, Hong; Wang, Youfa

2018-06-15

Study sex- and ethnic-specific childhood BMI growth trajectories of US children, and explore the potential causes of ethnic disparities in childhood BMI trajectories, including household socio-economic status (SES) and parenting practice using nationally representative longitudinal data. BMI trajectory curves between 7 months to 16 years of age were fitted using mixed effect models with fractional polynomial functions using pooled 10-year (1998-2008) longitudinal data collected from 29,254 children from two US nationally representative cohorts-Early Childhood Longitudinal Study-Birth (ECLS-B, 2001) and Kindergarten (ECLS-K, 1998-99). A multivariable regression model was used to examine the effects of SES and parenting factors on ethnic disparities in childhood BMI trajectory. Hispanic boys (HB) and African-American girls (AAG) continuously had the highest prevalence of overweight and obesity (HB: 52.5%, AAG: 49.1% around age of 11) and mean BMI after adiposity rebound than their counterparts. They had the earliest adiposity rebound (age mean [SD]: HB- 57.9 [7.8]; AAG- 59.0 [7.2] months), steeper BMI growth velocity (HB- 5.7 [1.8]; AAG- 7.0 [1.5] 10 -2  kg/m 2 /month), and highest area under curve (HB- 2724.5 [489.8]; AAG- 2681.2 [426.7] kg/m 2 *month) from adiposity rebound to 16 years of age. The racial/ethnic disparities in childhood BMI trajectories were associated with household SES and family rules for children's regular bedtime (p < 0.05). In the US, ethnic disparities in childhood BMI trajectories and obesity are apparent starting from adiposity rebound around age of five. Some minority groups have unfavorable BMI trajectories. These disparities are partially explained by household SES and parenting factors.

WWC Quick Review of the Article "School Recess and Group Classroom Behavior"

ERIC Educational Resources Information Center

What Works Clearinghouse, 2009

2009-01-01

This study examined whether providing daily recess to third graders improves their classroom behavior. The study analyzed a nationally representative sample of over 10,000 students enrolled in third grade during the 2001-2002 school year. Data were drawn from the Early Childhood Longitudinal Study, Kindergarten Class of 1998-1999. The authors…

Grandparents Providing Care to Grandchildren: A Population-Based Study of Continuity and Change

ERIC Educational Resources Information Center

Luo, Ye; LaPierre, Tracey A.; Hughes, Mary Elizabeth; Waite, Linda J.

2012-01-01

This study examines transitions in grandchild care and the characteristics of grandparents making these transitions, using longitudinal data from a nationally representative sample of 13,626 grandparents in the 1998-2008 Health and Retirement Study. More than 60% of grandparents provided grandchild care over the 10-year period; more than 70% of…

Logical Reasoning in Middle Childhood: A Study of Piagetian Concrete Operations Stage.

ERIC Educational Resources Information Center

Hooper, Frank H.; And Others

This 4-year longitudinal study of logical reasoning found complex interrelationships among different cognitive processes of children ages 6 to 15. Piaget's stage theory is discussed in the introduction, with a focus on the concrete operational stage in middle childhood. In the study, a representative array of logical concept tasks and short-term…

76 FR 76764 - Proposed Collection; Comment Request

Federal Register 2010, 2011, 2012, 2013, 2014

2011-12-08

... have been published in scholarly journals. The survey design provides data gathered from the same... comments concerning the proposed reinstatement of the ``National Longitudinal Survey of Youth 1979.'' A... INFORMATION: I. Background The National Longitudinal Survey of Youth 1979 (NLSY79) is a representative...

Science, Technology, Engineering, and Mathematics (STEM) Participation among College Students with an Autism Spectrum Disorder

ERIC Educational Resources Information Center

Wei, Xin; Yu, Jennifer W.; Shattuck, Paul; McCracken, Mary; Blackorby, Jose

2013-01-01

Little research has examined the popular belief that individuals with an autism spectrum disorder (ASD) are more likely than the general population to gravitate toward science, technology, engineering, and mathematics (STEM) fields. This study analyzed data from the National Longitudinal Transition Study-2, a nationally representative sample of…

Family Income and Early Achievement across the Urban-Rural Continuum

ERIC Educational Resources Information Center

Miller, Portia; Votruba-Drzal, Elizabeth; Setodji, Claude Messan

2013-01-01

Rural and suburban children account for the majority of poor children in the United States. Yet, most research examining poverty's associations with child development is focused on urban samples. Using nationally representative data from the Early Childhood Longitudinal Study, Birth Cohort (N ˜ 6,600), this study examines whether the form and…

Brief Report: Sexual Attraction and Relationships in Adolescents with Autism

ERIC Educational Resources Information Center

May, Tamara; Pang, Ken C.; Williams, Katrina

2017-01-01

Past research suggests more variation in sexual attraction in Autism Spectrum Disorder (ASD) using clinical samples. This study utilised a population representative group of 14/15 year olds from the Longitudinal Study of Australian Children. Ninety-four adolescents (73 males, 21 females) with ASD and 3454 (1685 males, 1675 females) without…

Long-Term Implications of Early Education and Care Programs for Australian Children

ERIC Educational Resources Information Center

Coley, Rebekah Levine; Lombardi, Caitlin McPherran; Sims, Jacqueline

2015-01-01

Using nationally representative data from the Longitudinal Study of Australian Children (LSAC; N = 5,107), this study assessed prospective connections between children's early education and care (EEC) experiences from infancy through preschool and their cognitive and behavioral functioning in 1st grade. Incorporating 6 waves of data, analyses…

Classroom Quality and Academic Skills: Approaches to Learning as a Moderator

ERIC Educational Resources Information Center

Meng, Christine

2015-01-01

The purpose of this study was to examine whether approaches to learning moderated the association between child care classroom environment and Head Start children's academic skills. The data came from the Head Start Family and Child Experiences Survey (FACES-2003 Cohort). The dataset is a nationally representative longitudinal study of Head Start…

Head Start, 4 years After Completing the Program

ERIC Educational Resources Information Center

Kim, Young-Joo

2013-01-01

This paper studies the effect of the Head Start program on children's achievements in reading and math tests during their first 4 years of schooling after completing the program. Using nationally representative data from the Early Childhood Longitudinal Study, I found large measurement error in the parental reports of Head Start attendance, which…

Examining Career Success of Minority and Women Emergency Medical Technicians (EMTs): A LEADS Project

ERIC Educational Resources Information Center

Russ-Eft, Darlene F.; Dickison, Philip D.; Levine, Roger

2008-01-01

Emergency medical technicians (EMTs) are a critical segment in prehospital medical care. This study examined EMT-paramedic career success focused on minorities and women, as part of the Longitudinal Emergency Medical Technician Attributes and Demographics Study (LEADS). The LEADS data come from a representative sampling of EMTs throughout the…

Socioeconomic Context, Social Support, and Adolescent Mental Health: A Multilevel Investigation

ERIC Educational Resources Information Center

Wight, Richard G.; Botticello, Amanda L.; Aneshensel, Carol S.

2006-01-01

This study examined whether the impact of contextual-level socioeconomic disadvantage on adolescent mental health is contingent upon individual-level perceptions of social support. Data are from the National Longitudinal Study of Adolescent Health (Add Health), a panel survey of a nationally representative United States sample (analytic N =…

Early Childhood Family Structure and Mother-Child Interactions: Variation by Race and Ethnicity

ERIC Educational Resources Information Center

Gibson-Davis, Christina M.; Gassman-Pines, Anna

2010-01-01

With data from the Early Childhood Longitudinal Study-Birth Cohort (n = 6,449), a nationally representative sample of births in 2001, we used hierarchical linear modeling to analyze differences in observed interactions between married, cohabiting, never-married, and divorced mothers and their children. In contrast to previous studies, we…

Does Computer Use Promote the Mathematical Proficiency of ELL Students?

ERIC Educational Resources Information Center

Kim, Sunha; Chang, Mido

2010-01-01

The study explored the effects of computer use on the mathematical performance of students with special attention to ELL students. To achieve a high generalizability of findings, the study used a U.S. nationally representative database, the Early Childhood Longitudinal Survey Kindergarten Cohort (ECLS-K), and adopted proper weights. The study…

The Effects of English Language Proficiency and Curricular Pathways: Latina/os' Mathematics Achievement in Secondary Schools

ERIC Educational Resources Information Center

Mosqueda, Eduardo; Maldonado, Saul I.

2013-01-01

This study analyzes nationally-representative quantitative data from the first (2002) and second (2004) waves of the Educational Longitudinal Study to examine the relationship between Latina/o secondary school students' degree of English-language proficiency (ELP), mathematics course-taking measures, and 12th grade mathematics achievement.…

The Prediction of Violence and Homicide in Young Men

ERIC Educational Resources Information Center

Loeber, Rolf; Pardini, Dustin; Homish, D. Lynn; Wei, Evelyn H.; Crawford, Anne M.; Farrington, David P.; Stouthamer-Loeber, Magda; Creemers, Judith; Koehler, Steven A.; Rosenfeld, Richard

2005-01-01

In this prospective study, the authors predicted violence and homicide in 3 representative school samples (N = 1,517). Participants were part of a longitudinal, multiple cohort study on the development of delinquency in boys from late childhood to early adulthood in Pittsburgh, Pennsylvania. Thirty-three participants were convicted of homicide,…

Science, Technology, Engineering, and Mathematics (STEM) Participation among College Students with an Autism Spectrum Disorder

ERIC Educational Resources Information Center

Wei, Xin; Christiano, Elizabeth R.; Yu, Jennifer W.; Blackorby, Jose; Shattuck, Paul; Newman, Lynn A.

2014-01-01

Little research has examined the popular belief that individuals with an autism spectrum disorder (ASD) are more likely than the general population to gravitate toward science, technology, engineering, and mathematics (STEM) fields. This study analyzed data from the National Longitudinal Transition Study-2, a nationally representative sample of…

Parent Involvement and Science Achievement: A Latent Growth Curve Analysis

ERIC Educational Resources Information Center

Johnson, Ursula Yvette

2011-01-01

This study examined science achievement growth across elementary and middle school and parent school involvement using the Early Childhood Longitudinal Study-Kindergarten Class of 1998-1999 (ECLS-K). The ECLS-K is a nationally representative kindergarten cohort of students from public and private schools who attended full-day or half-day…

Possible Insomnia Predicts Some Risky Behaviors among Adolescents when Controlling for Depressive Symptoms

ERIC Educational Resources Information Center

Catrett, Christina D.; Gaultney, Jane F.

2009-01-01

This study investigated whether previously reported links between sleep and risk taking among adolescents (E. M. O'Brien & J. A. Mindell, 2005) are associated--concurrently, longitudinally, or both--with sleep or underlying depression. The present study analyzed data from a nationally representative sample of 4,353 adolescents in the United…

Child Negative Emotionality and Caregiver Sensitivity across Context: Links with Children's Kindergarten Behaviour Problems

ERIC Educational Resources Information Center

Hartz, Karyn; Williford, Amanda

2015-01-01

Behavioural adjustment is critical for children's school readiness. This study used data from a nationally representative sample of children from the Early Childhood Longitudinal Study-Birth Cohort. We examined the effects of interactions between children's negative emotionality, maternal sensitivity and preschool teacher sensitivity on children's…

Does Critical Mass Matter? Women's Political Representation and Child Health in Developing Countries

ERIC Educational Resources Information Center

Swiss, Liam; Fallon, Kathleen M.; Burgos, Giovani

2012-01-01

Studies on developed countries demonstrate that an increase in women legislators leads to a prioritization in health, an increase in social policy spending, and a decrease in poverty. Women representatives could therefore improve development trajectories in developing countries; yet, currently, no cross-national and longitudinal studies explore…

Cultural events - does attendance improve health? Evidence from a Polish longitudinal study.

PubMed

Węziak-Białowolska, Dorota; Białowolski, Piotr

2016-08-05

Although there is strong advocacy for uptake of both the arts and creative activities as determinants of individual health conditions, studies evaluating causal influence of attendance at cultural events on population health using individual population data on health are scarce. If available, results are often only of an associative nature. In this light, this study investigated causative impact of attendance at cultural events on self-reported and physical health in the Polish population. Four recent waves (2009, 2011, 2013 and 2015) of the biennial longitudinal Polish household panel study, Social Diagnosis, were analysed. The data, representative for the Polish population aged over 16, with respect to age, gender, classes of place of residence and NUTS 2 regions, were collected from self-report questionnaires. Causative influence of cultural attendance on population health was established using longitudinal population representative data. To account for unobserved heterogeneity of individuals and to mitigate issues caused by omitted variables, a panel data model with a fixed effects estimator was applied. The endogeneity problem (those who enjoy good health are more likely to participate in cultural activities more frequently) was circumvented by application of instrumental variables. Results confirmed positive association between cultural attendance and self-reported health. However, in contrast to the often suggested positive causative relationship, such a link was not confirmed by the study. Additionally, no evidence was found to corroborate a positive impact from cultural attendance on physical health. Both findings were substantiated by augmentation in the longitudinal perspective and causal link. We showed the relation between attendance at cultural events and self-reported health could only be confirmed as associational. Therefore, this study provided little justification to encourage use of passive cultural participation as a measure of health promotion (improvement). Our study did not confirm any identifiable benefit to physical health from passive participation in culture. Future research should investigate the causative influence of active participation in creative activities on health outcomes as, in contrast to passive attendance, it may be influential.

Shared Etiology of Psychotic Experiences and Depressive Symptoms in Adolescence: A Longitudinal Twin Study

PubMed Central

Eley, Thalia C.; McGuire, Philip; Plomin, Robert; Cardno, Alastair G.; Freeman, Daniel; Ronald, Angelica

2016-01-01

Psychotic disorders and major depression, both typically adult-onset conditions, often co-occur. At younger ages psychotic experiences and depressive symptoms are often reported in the community. We used a genetically sensitive longitudinal design to investigate the relationship between psychotic experiences and depressive symptoms in adolescence. A representative community sample of twins from England and Wales was employed. Self-rated depressive symptoms, paranoia, hallucinations, cognitive disorganization, grandiosity, anhedonia, and parent-rated negative symptoms were collected when the twins were age 16 (N = 9618) and again on a representative subsample 9 months later (N = 2873). Direction and aetiology of associations were assessed using genetically informative cross-lagged models. Depressive symptoms were moderately correlated with paranoia, hallucinations, and cognitive disorganization. Lower correlations were observed between depression and anhedonia, and depression and parent-rated negative symptoms. Nonsignificant correlations were observed between depression and grandiosity. Largely the same genetic effects influenced depression and paranoia, depression and hallucinations, and depression and cognitive disorganization. Modest overlap in environmental influences also played a role in the associations. Significant bi-directional longitudinal associations were observed between depression and paranoia. Hallucinations and cognitive disorganization during adolescence were found to impact later depression, even after controlling for earlier levels of depression. Our study shows that psychotic experiences and depression, as traits in the community, have a high genetic overlap in mid-adolescence. Future research should test the prediction stemming from our longitudinal results, namely that reducing or ameliorating positive and cognitive psychotic experiences in adolescence would decrease later depressive symptoms. PMID:26994398

Can Parents Influence Children's Mathematics Achievement and Persistence in STEM Careers?

ERIC Educational Resources Information Center

Ing, Marsha

2014-01-01

This study explores the relationship between parental motivational practices, Children's mathematics achievement trajectories, and persistence in science, technology, engineering, and mathematics (STEM) careers. Nationally representative longitudinal survey data were analyzed using latent growth curve analysis. Findings indicate that…

Video Gaming Disorder and Sport and Exercise in Emerging Adulthood: A Longitudinal Study.

PubMed

Henchoz, Yves; Studer, Joseph; Deline, Stéphane; N'Goran, Alexandra A; Baggio, Stéphanie; Gmel, Gerhard

2016-01-01

Among the negative consequences of video gaming disorder, decreased participation in sport and exercise has received little attention. This study aimed to assess the longitudinal association between video gaming disorder and the level of sport and exercise in emerging adult men. A questionnaire was completed at baseline and 15-month follow-up by a representative national sample of 4,933 respondents. The seven items of the Game Addiction Scale were used to construct a latent variable representing video gaming disorder. Level of sport and exercise was also self-reported. Cross-lagged path modeling indicated a reciprocal causality between video gaming disorder and the level of sport and exercise, even after adjusting for a large set of confounders. These findings support the need for better promotion of sport and exercise among emerging adults in order to contribute to the prevention of video gaming disorder, and to raise the level of sport and exercise activity in addicted gamers.

Children's moral motivation, sympathy, and prosocial behavior.

PubMed

Malti, Tina; Gummerum, Michaela; Keller, Monika; Buchmann, Marlis

2009-01-01

Two studies investigated the role of children's moral motivation and sympathy in prosocial behavior. Study 1 measured other-reported prosocial behavior and self- and other-reported sympathy. Moral motivation was assessed by emotion attributions and moral reasoning following hypothetical transgressions in a representative longitudinal sample of Swiss 6-year-old children (N = 1,273). Prosocial behavior increased with increasing sympathy, especially if children displayed low moral motivation. Moral motivation and sympathy were also independently related to prosocial behavior. Study 2 extended the findings of Study 1 with a second longitudinal sample of Swiss 6-year-old children (N = 175) using supplementary measures of prosocial behavior, sympathy, and moral motivation. The results are discussed in regard to the precursors of the moral self in childhood.

Early maternal depressive symptoms and child growth trajectories: a longitudinal analysis of a nationally representative US birth cohort

PubMed Central

2014-01-01

Background Maternal depressive symptoms are negatively associated with early child growth in developing countries; however, few studies have examined this relation in developed countries or used a longitudinal design with data past the second year of the child’s life. We investigated if and when early maternal depressive symptoms affect average growth in young children up to age 6 in a nationally representative sample of US children. Methods Using data from 6,550 singleton births from the Early Childhood Longitudinal Study -- Birth Cohort (ECLS-B), we fit growth trajectory models with random effects to examine the relation between maternal depressive symptoms at 9 months based on the twelve-item version of the Center for Epidemiologic Studies Depression Scale (CES-D) and child height and body mass index (BMI) to age 6 years. Results Mothers with moderate/severe depressive symptoms at 9 months postpartum had children with shorter stature at this same point in time [average 0.26 cm shorter; 95% CI: 5 cm, 48 cm] than mothers without depressive symptoms; children whose mothers reported postpartum depressive symptoms remained significantly shorter throughout the child’s first 6 years. Conclusions Results suggest that the first year postpartum is a critical window for addressing maternal depressive symptoms in order to optimize child growth. Future studies should investigate the role of caregiving and feeding practices as potential mechanisms linking maternal depressive symptoms and child growth trajectories. PMID:25047367

The Psychological Effects of Unemployment and Unsatisfactory Employment on Young Adults: Findings from a 10-Year Longitudinal Study.

PubMed

Winefield, Anthony H; Delfabbro, Paul H; Winefield, Helen R; Duong, David; Malvaso, Catia

2017-01-01

The purpose of the present study was to extend the external validity of an earlier longitudinal study of school leavers by including participants from a representative sample of secondary schools. Questionnaires were administered annually to a sample of South Australian school leavers over a 10-year period. At Time 1 participants were in the last compulsory year of high school aged around 15 years and at Time 10 they were aged around 25 years. Results confirmed those from an earlier longitudinal study showing that the transition from school to satisfactory employment was associated with significant improvements in psychological well-being, whereas transition from school to unemployment or unsatisfactory employment showed no change in psychological well-being. The current findings extended the external validity of the earlier study because whereas participants in the earlier study were sampled from co-educational metropolitan public high schools, the current study included participants from every kind of high school: single sex as well as co-educational, rural as well as metropolitan, and private as well as public.

Longitudinal trajectories of mental health in Australian children aged 4-5 to 14-15 years.

PubMed

Christensen, Daniel; Fahey, Michael T; Giallo, Rebecca; Hancock, Kirsten J

2017-01-01

Mental health can affect young people's sense of wellbeing and life satisfaction, their ability to participate in employment and education, and their onward opportunities in life. This paper offers a rare opportunity to longitudinally examine mental health in a population-representative study of children aged 4-5 years to 14-15 years. Using data from the Longitudinal Study of Australian Children (LSAC), this study examined maternally-reported child mental health over a 10 year period, in order to understand their initial mental health status early in life and its change over time, as measured by the Strengths and Difficulties Questionnaire. Longitudinal models were fitted from ages 4-5 to 14-15 years. Results showed that child sex, maternal mental health, socio-economic status (family income, maternal education, neighbourhood disadvantage), maternal hostility, and child temperament (persistence, sociability, reactivity) are all independent contributors to child mental health at age 4. These effects largely persist over time, with the effects of maternal mental health increasing slightly over time. Persistence of these effects suggests the need for early intervention and supports. The independent contribution of these factors to child mental health suggests that multi-faceted approaches to child and maternal mental health are needed.

Personality Predicts Mortality Risk: An Integrative Data Analysis of 15 International Longitudinal Studies.

PubMed

Graham, Eileen K; Rutsohn, Joshua P; Turiano, Nicholas A; Bendayan, Rebecca; Batterham, Philip J; Gerstorf, Denis; Katz, Mindy J; Reynolds, Chandra A; Sharp, Emily S; Yoneda, Tomiko B; Bastarache, Emily D; Elleman, Lorien G; Zelinski, Elizabeth M; Johansson, Boo; Kuh, Diana; Barnes, Lisa L; Bennett, David A; Deeg, Dorly J H; Lipton, Richard B; Pedersen, Nancy L; Piccinin, Andrea M; Spiro, Avron; Muniz-Terrera, Graciela; Willis, Sherry L; Schaie, K Warner; Roan, Carol; Herd, Pamela; Hofer, Scott M; Mroczek, Daniel K

2017-10-01

This study examined the Big Five personality traits as predictors of mortality risk, and smoking as a mediator of that association. Replication was built into the fabric of our design: we used a Coordinated Analysis with 15 international datasets, representing 44,094 participants. We found that high neuroticism and low conscientiousness, extraversion, and agreeableness were consistent predictors of mortality across studies. Smoking had a small mediating effect for neuroticism. Country and baseline age explained variation in effects: studies with older baseline age showed a pattern of protective effects (HR<1.00) for openness, and U.S. studies showed a pattern of protective effects for extraversion. This study demonstrated coordinated analysis as a powerful approach to enhance replicability and reproducibility, especially for aging-related longitudinal research.

Personality Development during Teacher Preparation.

PubMed

Corcoran, Roisin P; O'Flaherty, Joanne

2016-01-01

Objective: The purpose of this 3-year longitudinal study was to examine pre-service teachers' personality trajectories as measured by the IPIP Big-Five factor markers during teacher preparation. The relationship between students' personality traits, social desirability, and prior academic attainment was also examined. Method: This 3-year longitudinal study invited participants from the first year of a 4-year undergraduate (UG) pre-service teacher education program, the class of 2017. The sample consisted of 305 students. Results: The results suggest that extraversion, agreeableness, conscientiousness, emotional stability, and openness to experience were best represented by a non-significant longitudinal change in means. Results also suggest that social desirability predicts agreeableness and emotional stability with small to moderate effect sizes. Conclusion: The study concludes that no value is added to pre-service teachers' personality traits during 3 years of tertiary education. Furthermore, the data presented does not support the view that academic attainment is a good predictor of personality traits. Implications for educational research, theory, and practice are considered.

Personality Development during Teacher Preparation

PubMed Central

Corcoran, Roisin P.; O’Flaherty, Joanne

2016-01-01

Objective: The purpose of this 3-year longitudinal study was to examine pre-service teachers’ personality trajectories as measured by the IPIP Big-Five factor markers during teacher preparation. The relationship between students’ personality traits, social desirability, and prior academic attainment was also examined. Method: This 3-year longitudinal study invited participants from the first year of a 4-year undergraduate (UG) pre-service teacher education program, the class of 2017. The sample consisted of 305 students. Results: The results suggest that extraversion, agreeableness, conscientiousness, emotional stability, and openness to experience were best represented by a non-significant longitudinal change in means. Results also suggest that social desirability predicts agreeableness and emotional stability with small to moderate effect sizes. Conclusion: The study concludes that no value is added to pre-service teachers’ personality traits during 3 years of tertiary education. Furthermore, the data presented does not support the view that academic attainment is a good predictor of personality traits. Implications for educational research, theory, and practice are considered. PMID:27877143

Predictors of Change in Eligibility Status among Preschoolers in Special Education

ERIC Educational Resources Information Center

Daley, Tamara C.; Carlson, Elaine

2009-01-01

Relatively little is known about the incidence of declassification among young children who receive preschool special education services or about factors associated with declassification. The Pre-Elementary Education Longitudinal Study (PEELS) follows a nationally representative sample of children who were receiving preschool special education…

Upper-extremity phocomelia reexamined: a longitudinal dysplasia.

PubMed

Goldfarb, Charles A; Manske, Paul R; Busa, Riccardo; Mills, Janith; Carter, Peter; Ezaki, Marybeth

2005-12-01

In contrast to longitudinal deficiencies, phocomelia is considered a transverse, intercalated segmental dysplasia. Most patients demonstrate severe, but not otherwise classifiable, upper-extremity deformities, which usually cannot be placed into one of three previously described phocomelia groups. Additionally, these phocomelic extremities do not demonstrate true segmental deficits; the limb is also abnormal proximal and distal to the segmental defect. The purpose of this investigation was to present evidence that upper-extremity abnormalities in patients previously diagnosed as having phocomelia in fact represent a proximal continuum of radial or ulnar longitudinal dysplasia. The charts and radiographs of forty-one patients (sixty extremities) diagnosed as having upper-extremity phocomelia were reviewed retrospectively. On the basis of the findings on the radiographs, the disorders were categorized into three groups: (1) proximal radial longitudinal dysplasia, which was characterized by an absent proximal part of the humerus, a nearly normal distal part of the humerus, a completely absent radius, and a radial-sided hand dysplasia; (2) proximal ulnar longitudinal dysplasia, characterized by a short one-bone upper extremity that bifurcated distally and by severe hand abnormalities compatible with ulnar dysplasia; and (3) severe combined dysplasia, with type A characterized by an absence of the forearm segment (i.e., the radius and ulna) and type B characterized by absence of the arm and forearm (i.e., the hand attached to the thorax). Twenty-nine limbs in sixteen patients could be classified as having proximal radial longitudinal dysplasia. Systemic medical conditions such as thrombocytopenia-absent radius syndrome were common in those patients, but additional musculoskeletal conditions were rare. Twenty limbs in seventeen patients could be classified as having proximal ulnar longitudinal dysplasia. Associated musculoskeletal abnormalities, such as proximal femoral focal deficiency, were common in those patients. Eleven limbs in ten patients were identified as having severe combined dysplasia, which was type A in seven of them and type B in four. Four patients with severe combined dysplasia had congenital cardiac anomalies, and four had associated musculoskeletal abnormalities. Three of the four patients with the type-B disorder had a contralateral ulnar longitudinal dysplasia. We propose that cases previously classified as upper-extremity phocomelia represent a spectrum of severe longitudinal dysplasia, as none of the sixty extremities that we studied demonstrated a true intercalary deficiency. These findings have both developmental and genetic implications.

Generalized linear mixed models with varying coefficients for longitudinal data.

PubMed

Zhang, Daowen

2004-03-01

The routinely assumed parametric functional form in the linear predictor of a generalized linear mixed model for longitudinal data may be too restrictive to represent true underlying covariate effects. We relax this assumption by representing these covariate effects by smooth but otherwise arbitrary functions of time, with random effects used to model the correlation induced by among-subject and within-subject variation. Due to the usually intractable integration involved in evaluating the quasi-likelihood function, the double penalized quasi-likelihood (DPQL) approach of Lin and Zhang (1999, Journal of the Royal Statistical Society, Series B61, 381-400) is used to estimate the varying coefficients and the variance components simultaneously by representing a nonparametric function by a linear combination of fixed effects and random effects. A scaled chi-squared test based on the mixed model representation of the proposed model is developed to test whether an underlying varying coefficient is a polynomial of certain degree. We evaluate the performance of the procedures through simulation studies and illustrate their application with Indonesian children infectious disease data.

75 FR 80540 - Proposed Collection, Comment Request

Federal Register 2010, 2011, 2012, 2013, 2014

2010-12-22

... 160 articles examining NLSY97 data have been published in scholarly journals. The survey design... comments concerning the proposed revision of the ``National Longitudinal Survey of Youth 1997.'' A copy of.... Background The National Longitudinal Survey of Youth 1997 (NLSY97) is a nationally representative sample of...

Gender Segregation in Pre-Adolescent Peer Groups as a Matter of Class: Results from Two German Studies

ERIC Educational Resources Information Center

Pfaff, Nicolle

2010-01-01

This study examines social class differences in the gender segregation of children and pre-adolescents and draws upon data from two recent German studies. Based on longitudinal quantitative data from a representative children's survey, the first analysis suggests that in comparison to children from upper-class families, lower-class children tend…

Mortality in Autism: A Prospective Longitudinal Community-Based Study

ERIC Educational Resources Information Center

Gillberg, Christopher; Billstedt, Eva; Sundh, Valter; Gillberg, I. Carina

2010-01-01

The purposes of the present study were to establish the mortality rate in a representative group of individuals (n = 120) born in the years 1962-1984, diagnosed with autism/atypical autism in childhood and followed up at young adult age (greater than or equal to 18 years of age), and examine the risk factors and causes of death. The study group,…

Is It the Music or Is It Selection Bias? A Nationwide Analysis of Music and Non-Music Students' SAT Scores

ERIC Educational Resources Information Center

Elpus, Kenneth

2013-01-01

This study examined the college entrance examination scores of music and non-music students in the United States, drawing data from the restricted-use data set of the Education Longitudinal Study of 2002 (ELS), a nationally representative education study ("N" = 15,630) conducted by the National Center for Education Statistics. Analyses…

How Husbands Cope When Pregnancy Fails: A Longitudinal Study of Infertility and Psychosocial Generativity. Working Paper No. 167.

ERIC Educational Resources Information Center

Snarey, John; And Others

The experience of marital infertility is a major biosocial life crisis that also represents a serious threat to the development of psychosocial generativity. Psychological studies of the consequences of involuntary infertility, however, are rare. A study was undertaken to identify variations in the coping patterns used by men who have experienced…

Children's School Readiness in the ECLS-K: Predictions to Academic, Health, and Social Outcomes in First Grade

ERIC Educational Resources Information Center

Hair, Elizabeth; Halle, Tamara; Terry-Humen, Elizabeth; Lavelle, Bridget; Calkins, Julia

2006-01-01

Two studies examine patterns of school readiness in children at school entry and how these patterns predict first-grade outcomes in a nationally representative sample of first-time kindergartners from the Early Childhood Longitudinal Study--Kindergarten Class of 1998-1999 (N = 17,219). In Study 1, cluster analyses revealed four profiles at…

Extending the Trait-State-Occasion Model: How Important Is Within-Wave Measurement Equivalence?

ERIC Educational Resources Information Center

Ciesla, Jeffrey A.; Cole, David A.; Steiger, James H.

2007-01-01

Trait-State-Occasion (TSO) covariance models represent an important advance in methods for studying the longitudinal stability of latent constructs. Such models have only been examined under fairly restricted conditions (e.g., having only 2 tau-equivalent indicators per wave). In this study, Monte Carlo simulations revealed the effects of having 2…

The Ecology of Young Children's Behaviour and Social Competence: Child Characteristics, Socio-Economic Factors and Parenting

ERIC Educational Resources Information Center

Hartas, Dimitra

2011-01-01

Using a longitudinal, UK representative sample from the Millennium Cohort Study, the present study examined the effects of socio-economic factors on mother- and teacher-rated behaviour, and the unique and cumulative contribution of both risk and protective factors inherent in children's proximal and distal influences to behaviour during the…

Earning and Learning: The Impact of Paid Work on First-Generation Student Persistence

ERIC Educational Resources Information Center

Micka-Pickunka, Marilyn

2010-01-01

This study utilized the Beginning Postsecondary Student (BPS) longitudinal data set (2004-2006) from the National Center for Educational Statistics (NCES), which will follow for six academic years a nationally representative sample of students who began their postsecondary education during the 2004-2005 academic year. The purpose of this study is…

The Integration of Personal Financial Knowledge into Multi-Disciplines: The First Step of Reinforcement

ERIC Educational Resources Information Center

Yates, Dan; Ward, Chris

2014-01-01

This study represents an extension of longitudinal studies regarding personal financial literacy. Graduating college students must have a financial plan in place as they enter the workforce along with a "game plan" on how to attack their college debt. A college personal finance course can help each student develop their personalized…

Variance of Student Achievement in Effective and Ineffective Schools: Inconsistencies across SES Categories.

ERIC Educational Resources Information Center

Crone, Linda J.; Tashakkori, Abbas

Findings from a study that sought to determine the degree to which effective schools are uniformly effective for all students regardless of socioeconomic status (SES) are presented in this paper. Data were derived from a large nationally representative set of 989 schools that were involved in the National Education Longitudinal Study (NELS) of…

School Truancy and the Disciplinary Problems of Bullying Victims

ERIC Educational Resources Information Center

Gastic, Billie

2008-01-01

This study describes the truancy and disciplinary problems of high school bullying victims in the USA. Analyses are based on data from the Educational Longitudinal Study of 2002, a nationally representative sample of 10th graders (students aged 14-15) in the USA. Being bullied is found to be positively associated with increased risk of being…

School Predictors of Violent Criminality in Adulthood: Findings from a Nationally Representative Longitudinal Study

ERIC Educational Resources Information Center

Katsiyannis, Antonis; Thompson, Martie P.; Barrett, David E.; Kingree, J. B.

2013-01-01

School-related problems such as poor academic performance, truancy, frequent suspensions, and grade repeating have been identified as risk factors for adolescent behavior problems. The purpose of the current study was to examine the effect of school-related factors on violent criminality in adulthood, based on data from the National Longitudinal…

Exploring the Relationship between State Financial Aid Policy and Postsecondary Enrollment Choices: A Focus on Income and Race Differences

ERIC Educational Resources Information Center

Kim, Jiyun

2012-01-01

This study explores the relationship between state financial aid policies and postsecondary enrollment for high school graduates (or equivalent diploma holders). Utilizing an event history modeling for a nationally representative sample from the National Education Longitudinal Study (NELS:88/2000) in addition to state-level policy variables, this…

Reaction and Adaptation to the Birth of a Child: A Couple-Level Analysis

ERIC Educational Resources Information Center

Dyrdal, Gunvor Marie; Lucas, Richard E.

2013-01-01

The present study explored how life satisfaction changes before and after childbirth among first-time parents from a nationally representative, longitudinal study of Germans. Life satisfaction increased before pregnancy to a peak just after birth and then returned to the baseline level within 2 years postpartum. The 2 members of the same couple…

Influences of Marriage, Motherhood, and Other Life Events on Australian Women's Employment Aspirations

ERIC Educational Resources Information Center

Johnstone, Melissa; Lucke, Jayne; Lee, Christina

2011-01-01

The study contributes to the understandings of how women negotiate work and family over the life course by investigating what factors impact young women's aspirations for full time, part-time, and other forms of work. Using data from the Australian Longitudinal Study on Women's Health (ALSWH) with its nationally representative sample of Australian…

Early Predictors of ASD in Young Children Using a Nationally Representative Data Set

ERIC Educational Resources Information Center

Jeans, Laurie M.; Santos, Rosa Milagros; Laxman, Daniel J.; McBride, Brent A.; Dyer, W. Justin

2013-01-01

Current clinical diagnosis of Autism Spectrum Disorders (ASD) occurs between 3 and 4 years of age, but increasing evidence indicates that intervention begun earlier may improve outcomes. Using secondary analysis of the Early Childhood Longitudinal Study-Birth Cohort data set, the current study identifies early predictors prior to the diagnosis of…

Sense of Coherence, Hope and Values among Adolescents under Missile Attacks: A Longitudinal Study

ERIC Educational Resources Information Center

Braun-Lewensohn, Orna; Sagy, Shifra

2010-01-01

This study aimed to explore measures of spirituality--sense of coherence (SOC), hope and values--among adolescents living in a violent political area and experiencing missile attacks. The three variables represent attributes of spirituality, such as searching for meaning and purpose in life, hope and feelings about the future, as well as values…

Analysis of Subsequent Educational Decisions of High School Dropouts and Their Life Outcomes.

ERIC Educational Resources Information Center

Chan, Chi-Keung; Kato, Kentaro; Davenport, Ernest C., Jr.; Guven, Kamil

This study used data for a representative sample of 8th graders from the National Educational Longitudinal Study of 1988. The intent was to (1) compare student's dropout status with variables such as demographics, academic and economic factors, limited English proficiency status, and other risk factors of dropping out, (2) distinguish factors…

Perceptions of Healthy Eating: A Qualitative Study of School-Going Children in South India

ERIC Educational Resources Information Center

Swaminathan, S.; Thomas, T.; Kurpad, A. V.; Vaz, M.

2009-01-01

Objective: To document children's views on healthy eating, perceptions of healthy and unhealthy foods and health consequences of consuming unhealthy foods. Design: Baseline data from a three-year longitudinal study. Setting A purposive sample of 307 school children aged 7 to 15 years were recruited from three schools representing various…

Expressivity in Children's Drawings: A Longitudinal Analysis.

ERIC Educational Resources Information Center

Ives, William

This paper reports a follow-up study of 5-, 7-, and 9-year-old subjects who had participated in an investigation of the nature of children's and adults' ability to graphically represent expressive qualities (i.e., happy, sad, angry, loud, quiet, hard). In the original study, the use of literal representation (such as a smiling face on a tree) and…

Postsecondary Pathways and Persistence for STEM versus Non-STEM Majors: Among College Students with an Autism Spectrum Disorder

ERIC Educational Resources Information Center

Wei, Xin; Christiano, Elizabeth R. A.; Yu, Jennifer W.; Blackorby, Jose; Shattuck, Paul; Newman, Lynn A.

2014-01-01

Little is known about postsecondary pathways and persistence among college students with an autism spectrum disorder (ASD). This study analyzed data from the National Longitudinal Transition Study-2, 2001-2009, a nationally representative sample of students in special education with an ASD who progressed from high school to postsecondary…

Women in Intercollegiate Sport: A Longitudinal Study--Fifteen Year Update 1977-1992.

ERIC Educational Resources Information Center

Acosta, R. Vivian; Carpenter, Linda Jean

With the enactment of Title IX in 1972, sports participation by female athletes in intercollegiate sports has generally increased, while leadership positions have decreased. The data summarized in this paper represent 15 years (1977-1992) of information on the status of women in intercollegiate athletics gathered in an on-going national study of…

Mediated Pathways from Maternal Depression and Early Parenting to Children's Executive Function and Externalizing Behaviour Problems

ERIC Educational Resources Information Center

Baker, Claire; Kuhn, Laura

2018-01-01

Structural equation models were used to examine pathways from maternal depression and early parenting to children's executive function (EF) and externalizing behaviours in the first nationally representative study to obtain direct assessments of children's kindergarten EF skills (i.e., the Early Childhood Longitudinal Study Kindergarten Class of…

Are School Counselors Impacting Underrepresented Students' Thinking about Postsecondary Education? A Nationally Representative Study

ERIC Educational Resources Information Center

Cholewa, Blaire; Burkhardt, Christina K.; Hull, Michael F.

2016-01-01

Using the HSLS:09 [High School Longitudinal Study of 2009] data set and social capital theory as a framework, the authors examined which student and school characteristics predicted students' identification of their school counselor as the person who had the most influence in their thinking about postsecondary education (N = 3,239,560). Results…

Nonmarital Fertility, Family Structure, and the Early School Achievement of Young Children from Different Race/Ethnic and Immigration Groups

ERIC Educational Resources Information Center

Crosnoe, Robert; Wildsmith, Elizabeth

2011-01-01

Working from a life course perspective, this study examined the links between mothers' fertility and relationship statuses and children's early school achievement and how these links varied by race/ethnicity and immigration status. Analyses of nationally representative data from the Early Childhood Longitudinal Study-Kindergarten Cohort revealed…

Loneliness, Social Networks, and Mortality: 18 Years of Follow-up

ERIC Educational Resources Information Center

Iecovich, Esther; Jacobs, Jeremy M.; Stessman, Jochanan

2011-01-01

We examined the influence of changes in loneliness and social support networks upon mortality during 18 years of follow-up among an elderly cohort and determined the gender-specific nature of this relationship. The study is based on data collected from the Jerusalem Longitudinal Study (1990-2008), which has followed a representative sample of 605…

Community College Low-Income and Minority Student Completion Study: Descriptive Statistics from the 1992 High School Cohort

ERIC Educational Resources Information Center

Bailey, Thomas; Jenkins, Davis; Leinbach, Timothy

2005-01-01

This report summarizes statistics on access and attainment in higher education, focusing particularly on community college students, using data from the National Education Longitudinal Study of 1988 (NELS:88), which follows a nationally representative sample of individuals who were eighth graders in the spring of 1988. A sample of these…

Postsecondary Pathways and Persistence for STEM versus Non-STEM Majors; Among College Students with an Autism Spectrum Disorder

ERIC Educational Resources Information Center

Wei, Xin; Christiano, Elizabeth R.; Yu, Jennifer W.; Blackorby, Jose; Shattuck, Paul; Newman, Lynn

2014-01-01

Little is known about postsecondary pathways and persistence among college students with an Autism Spectrum Disorder (ASD). This study analyzed data from the National Longitudinal Transition Study-2, 2001-2009, a nationally representative sample of students in special education with an ASD who progressed from high school to postsecondary…

Momentum Trumps Intention: Failed Intentions toward Higher Education of Low-Wage Working Women

ERIC Educational Resources Information Center

Deutsch, Francine M.; Ta, Phuong H.

2015-01-01

Two longitudinal studies examined the effects of explicit intention, as described in Ajzen's (1991) theory of planned behavior, on preschool teachers' success in enrolling in college. In the first study, 88 low-wage female teachers and teachers' aides who represented 85 child care centers were surveyed about their intentions to pursue college…

Educational Achievement of Immigrant Adolescents in Spain: Do Gender and Region of Origin Matter?

ERIC Educational Resources Information Center

Vaquera, Elizabeth; Kao, Grace

2012-01-01

This study explores the educational achievement of immigrant youth in Spain employing data from 3 waves of the Longitudinal Study of Families and Childhood (Panel de Families i Infancia), a representative sample of children in Catalonia first interviewed at ages 13-16 in 2006 (N = 2,710). Results suggest consistent disadvantage in achievement…

Gendered Fields: Sports and Advanced Course Taking in High School

PubMed Central

Pearson, Jennifer; Crissey, Sarah R.; Riegle-Crumb, Catherine

2010-01-01

This study explores the association between sports participation and course taking in high school, specifically comparing subjects with varied gendered legacies—science and foreign language. Analyses of a nationally representative longitudinal sample (N=5,447) of U.S. adolescents from the National Longitudinal Study of Adolescent Health and the linked Adolescent Health and Academic Achievement transcript study show that male and female athletes are more likely than non-athletes to take both advanced foreign language and Physics, largely because of their higher academic orientation. However, the association between sports participation and course taking was strongest for girls’ Physics coursework, suggesting that sports may provide girls with a unique opportunity to develop the skills and confidence to persevere in the masculine domain of science. PMID:20221304

78 FR 5211 - Proposed Collection, Comment Request

Federal Register 2010, 2011, 2012, 2013, 2014

2013-01-24

.... The survey design provides data gathered from the same respondents over time to form the only dataset... approval has expired collection of the ``National Longitudinal Survey of Youth 1997.'' A copy of the... National Longitudinal Survey of Youth 1997 (NLSY97) is a nationally representative sample of persons who...

The re-identification risk of Canadians from longitudinal demographics

PubMed Central

2011-01-01

Background The public is less willing to allow their personal health information to be disclosed for research purposes if they do not trust researchers and how researchers manage their data. However, the public is more comfortable with their data being used for research if the risk of re-identification is low. There are few studies on the risk of re-identification of Canadians from their basic demographics, and no studies on their risk from their longitudinal data. Our objective was to estimate the risk of re-identification from the basic cross-sectional and longitudinal demographics of Canadians. Methods Uniqueness is a common measure of re-identification risk. Demographic data on a 25% random sample of the population of Montreal were analyzed to estimate population uniqueness on postal code, date of birth, and gender as well as their generalizations, for periods ranging from 1 year to 11 years. Results Almost 98% of the population was unique on full postal code, date of birth and gender: these three variables are effectively a unique identifier for Montrealers. Uniqueness increased for longitudinal data. Considerable generalization was required to reach acceptably low uniqueness levels, especially for longitudinal data. Detailed guidelines and disclosure policies on how to ensure that the re-identification risk is low are provided. Conclusions A large percentage of Montreal residents are unique on basic demographics. For non-longitudinal data sets, the three character postal code, gender, and month/year of birth represent sufficiently low re-identification risk. Data custodians need to generalize their demographic information further for longitudinal data sets. PMID:21696636

Differences in time to peak carbachol-induced contractions between circular and longitudinal smooth muscles of mouse ileum.

PubMed

Azuma, Yasu-Taka; Samezawa, Nanako; Nishiyama, Kazuhiro; Nakajima, Hidemitsu; Takeuchi, Tadayoshi

2016-01-01

The muscular layer in the GI tract consists of an inner circular muscular layer and an outer longitudinal muscular layer. Acetylcholine (ACh) is the representative neurotransmitter that causes contractions in the gastrointestinal tracts of most animal species. There are many reports of muscarinic receptor-mediated contraction of longitudinal muscles, but few studies discuss circular muscles. The present study detailed the contractile response in the circular smooth muscles of the mouse ileum. We used small muscle strips (0.2 mm × 1 mm) and large muscle strips (4 × 4 mm) isolated from the circular and longitudinal muscle layers of the mouse ileum to compare contraction responses in circular and longitudinal smooth muscles. The time to peak contractile responses to carbamylcholine (CCh) were later in the small muscle strips (0.2 × 1 mm) of circular muscle (5.7 min) than longitudinal muscles (0.4 min). The time to peak contractile responses to CCh in the large muscle strips (4 × 4 mm) were also later in the circular muscle (3.1 min) than the longitudinal muscle (1.4 min). Furthermore, a muscarinic M2 receptor antagonist and gap junction inhibitor significantly delayed the time to peak contraction of the large muscle strips (4 × 4 mm) from the circular muscular layer. Our findings indicate that muscarinic M2 receptors in the circular muscular layer of mouse ileum exert a previously undocumented function in gut motility via the regulation of gap junctions.

Advantaged/Disadvantaged School Neighborhoods, Parental Networks, and Parental Involvement at Elementary School

ERIC Educational Resources Information Center

Li, Angran; Fischer, Mary J.

2017-01-01

This article examines the relationship between parental networks and parental school involvement during the elementary school years. Using a large, nationally representative data set of elementary school students--the Early Childhood Longitudinal Study-Kindergarten Cohort--and contextual data from the 2000 U.S. Census, our multilevel analysis…

Participation in Learning and Depressive Symptoms

ERIC Educational Resources Information Center

Jenkins, Andrew

2012-01-01

This paper reports the findings of research on relationships between depression and participation in learning using data from a large sample of older adults. The objective was to establish whether learning can reduce the risk of depression. Data were obtained from the English Longitudinal Study of Ageing, a nationally-representative sample of…

A Year in Head Start: Children, Families and Programs. ACF-ORPRE Report

ERIC Educational Resources Information Center

Aikens, Nikki; Tarullo, Louisa; Hulsey, Lara; Ross, Christine; West, Jerry; Xue, Yange

2010-01-01

The Head Start Family and Child Experiences Survey (FACES) was first launched in 1997 as a periodic longitudinal study of program performance. Successive nationally representative samples of Head Start children, their families, classrooms, and programs provide descriptive information on the population served; staff qualifications, credentials,…

Developmental Change in Social Responsibility during Adolescence: An Ecological Perspective

ERIC Educational Resources Information Center

Wray-Lake, Laura; Syvertsen, Amy K.; Flanagan, Constance A.

2016-01-01

Social responsibility can be defined as a set of prosocial values representing personal commitments to contribute to community and society. Little is known about developmental change--and predictors of that change--in social responsibility during adolescence. The present study used an accelerated longitudinal research design to investigate the…

Individual Differences in Achievement Goals: A Longitudinal Study of Cognitive, Emotional, and Achievement Outcomes

ERIC Educational Resources Information Center

Daniels, Lia M.; Haynes, Tara L.; Stupnisky, Robert H.; Perry, Raymond P.; Newall, Nancy E.; Pekrun, Reinhard

2008-01-01

Within achievement goal theory debate remains regarding the adaptiveness of certain combinations of goals. Assuming a multiple-goals perspective, we used cluster analysis to classify 1002 undergraduate students according to their mastery and performance-approach goals. Four clusters emerged, representing different goal combinations: high…

The longitudinal equations of motion of a tilt prop/rotor aircraft including the effects of wing and prop/rotor blade flexibility

NASA Technical Reports Server (NTRS)

Curtiss, H. C., Jr.

1976-01-01

The equations of motion for the longitudinal dynamics of a tilting prop/rotor aircraft are developed. The analysis represents an extension of the equations of motion. The effects of the longitudinal degrees of freedom of the body (pitch, heave and horizontal velocity) are included. The results of body freedom can be added to the equations of motion for the flexible wing propeller combination.

Shared Etiology of Psychotic Experiences and Depressive Symptoms in Adolescence: A Longitudinal Twin Study.

PubMed

Zavos, Helena M S; Eley, Thalia C; McGuire, Philip; Plomin, Robert; Cardno, Alastair G; Freeman, Daniel; Ronald, Angelica

2016-09-01

Psychotic disorders and major depression, both typically adult-onset conditions, often co-occur. At younger ages psychotic experiences and depressive symptoms are often reported in the community. We used a genetically sensitive longitudinal design to investigate the relationship between psychotic experiences and depressive symptoms in adolescence. A representative community sample of twins from England and Wales was employed. Self-rated depressive symptoms, paranoia, hallucinations, cognitive disorganization, grandiosity, anhedonia, and parent-rated negative symptoms were collected when the twins were age 16 (N = 9618) and again on a representative subsample 9 months later (N = 2873). Direction and aetiology of associations were assessed using genetically informative cross-lagged models. Depressive symptoms were moderately correlated with paranoia, hallucinations, and cognitive disorganization. Lower correlations were observed between depression and anhedonia, and depression and parent-rated negative symptoms. Nonsignificant correlations were observed between depression and grandiosity. Largely the same genetic effects influenced depression and paranoia, depression and hallucinations, and depression and cognitive disorganization. Modest overlap in environmental influences also played a role in the associations. Significant bi-directional longitudinal associations were observed between depression and paranoia. Hallucinations and cognitive disorganization during adolescence were found to impact later depression, even after controlling for earlier levels of depression. Our study shows that psychotic experiences and depression, as traits in the community, have a high genetic overlap in mid-adolescence. Future research should test the prediction stemming from our longitudinal results, namely that reducing or ameliorating positive and cognitive psychotic experiences in adolescence would decrease later depressive symptoms. © The Author 2016. Published by Oxford University Press on behalf of the Maryland Psychiatric Research Center.

Civic-Political Engagement: Developmental Science Comes of Age. Commentary on the Thematic Issue "The Development of Civic Engagement: Results from Longitudinal Studies"

ERIC Educational Resources Information Center

Youniss, James

2014-01-01

In this commentary, the author states that a major step in bringing developmental studies into correspondence with other disciplines that give civic and political engagement central importance has taken place. The projects reported in this issue represent an important historical development within the discipline of developmental studies. Seen is a…

School and Child Level Predictors of Academic Success for African American Children in Third Grade: Implications for No Child Left behind

ERIC Educational Resources Information Center

Graves, Scott

2011-01-01

The purpose of this study was to examine correlates of being at expected grade level in reading in the third grade. Participants for this study were a nationally representative sample of African American children from the Early Childhood Longitudinal Study (ECLS-K). Multilevel modeling was conducted to determine significant predictors of academic…

Longitudinal waves in carbon nanotubes in the presence of transverse magnetic field and elastic medium

NASA Astrophysics Data System (ADS)

Liu, Hu; Liu, Hua; Yang, Jialing

2017-09-01

In the present paper, the coupling effect of transverse magnetic field and elastic medium on the longitudinal wave propagation along a carbon nanotube (CNT) is studied. Based on the nonlocal elasticity theory and Hamilton's principle, a unified nonlocal rod theory which takes into account the effects of small size scale, lateral inertia and radial deformation is proposed. The existing rod theories including the classic rod theory, the Rayleigh-Love theory and Rayleigh-Bishop theory for macro solids can be treated as the special cases of the present model. A two-parameter foundation model (Pasternak-type model) is used to represent the elastic medium. The influence of transverse magnetic field, Pasternak-type elastic medium and small size scale on the longitudinal wave propagation behavior of the CNT is investigated in detail. It is shown that the influences of lateral inertia and radial deformation cannot be neglected in analyzing the longitudinal wave propagation characteristics of the CNT. The results also show that the elastic medium and the transverse magnetic field will also affect the longitudinal wave dispersion behavior of the CNT significantly. The results obtained in this paper are helpful for understanding the mechanical behaviors of nanostructures embedded in an elastic medium.

Gender Differences in Predictors of Mental Health among Older Adults in South Korea

ERIC Educational Resources Information Center

Lee, Eun-Kyoung Othelia; Lee, Jungui

2011-01-01

As aging is occurring at a rate never before seen in South Korea, the present study examines the predictors of mental health in a nationally representative sample of older adults (n = 4,155), drawn from Wave I of the Korean Longitudinal Study on Aging. Findings show that sociodemographic factors, chronic health conditions, level of cognition, and…

How Do Children Spend Their Time? Children's Activities, School Achievement, and Well-Being. Research on Today's Issues, Issue No. 11.

ERIC Educational Resources Information Center

Population Reference Bureau, Inc., Washington, DC.

This briefing paper describes research findings on factors linked to children's school achievement and emotional adjustment. The findings are based on the Child Development Supplement of the Panel Study of Income Dynamics, a nationally representative, longitudinal study of children and families conducted at the University of Michigan and supported…

Gender Differences in the Development of Dieting from Adolescence to Early Adulthood: A Longitudinal Study

ERIC Educational Resources Information Center

von Soest, Tilmann; Wichstrom, Lars

2009-01-01

This study examines gender differences in the development of dieting among a representative sample of 1,368 Norwegian boys and girls. The respondents were followed over 3 time points from ages 13/14 to 20/21. Latent growth curve analyses were conducted showing that girls' dieting scores increased while boys' scores remained constant. Gender…

Do Preschool Special Education Services Make a Difference in Kindergarten Reading and Mathematics Skills?: A Propensity Score Weighting Analysis

ERIC Educational Resources Information Center

Sullivan, Amanda L.; Field, Samuel

2013-01-01

The purpose of this study was to examine the average treatment effect of preschool special education services on children's kindergarten academic skills. Using data from a nationally representative sample of United States children who participated in the Early Childhood Longitudinal Study--Birth Cohort, we examined the effectiveness of preschool…

Biological Maturation in Adolescence and the Development of Drinking Habits and Alcohol Abuse among Young Males: A Prospective Longitudinal Study.

ERIC Educational Resources Information Center

Andersson, Tommy; Magnusson, David

1990-01-01

The relationship between biological maturation, as evidenced by skeletal growth, during adolescence and the development of drinking habits and alcohol abuse was studied for a representative group of Swedish males (N=88). Early and late maturers had more advanced drinking habits at age 14 years than did normally maturing subjects. (TJH)

Social Bonds across Immigrant Generations: Bonding to School and Examining the Relevance of Assimilation

ERIC Educational Resources Information Center

Peguero, Anthony A.; Bondy, Jennifer M.; Hong, Jun Sung

2017-01-01

The focus of this study is to investigate school bonding among adolescents in immigrant families using a segmented assimilation theoretical framework. Data are drawn from the Educational Longitudinal Study of 2002, a nationally representative sample of 10th graders. We focus on a subsample consisting of 9,870 first- (N = 1,170, 12 %), second- (N =…

Epigenetic Patterns Modulate the Connection between Developmental Dynamics of Parenting and Offspring Psychosocial Adjustment

ERIC Educational Resources Information Center

Naumova, Oksana Yu.; Hein, Sascha; Suderman, Matthew; Barbot, Baptiste; Lee, Maria; Raefski, Adam; Dobrynin, Pavel V.; Brown, Pamela J.; Szyf, Moshe; Luthar, Suniya S.; Grigorenko, Elena L.

2016-01-01

This study attempted to establish and quantify the connections between parenting, offspring psychosocial adjustment, and the epigenome. The participants, 35 African American young adults (19 females and 16 males; age = 17-29.5 years), represented a subsample of a 3-wave longitudinal 15-year study on the developmental trajectories of low-income…

The Unequal Burden of Weight Gain: An Intersectional Approach to Understanding Social Disparities in BMI Trajectories from 1986 to 2001/2002

ERIC Educational Resources Information Center

Ailshire, Jennifer A.; House, James S.

2011-01-01

The implications of recent weight gain trends for widening social disparities in body weight in the United States are unclear. Using an intersectional approach to studying inequality, and the longitudinal and nationally representative American's Changing Lives study (1986-2001/2002), we examine social disparities in body mass index trajectories…

Does Viewing Pornography Reduce Marital Quality Over Time? Evidence from Longitudinal Data.

PubMed

Perry, Samuel L

2017-02-01

Numerous studies have examined the connection between pornography viewing and marital quality, with findings most often revealing a negative association. Data limitations, however, have precluded establishing directionality with a representative sample. This study is the first to draw on nationally representative, longitudinal data (2006-2012 Portraits of American Life Study) to test whether more frequent pornography use influences marital quality later on and whether this effect is moderated by gender. In general, married persons who more frequently viewed pornography in 2006 reported significantly lower levels of marital quality in 2012, net of controls for earlier marital quality and relevant correlates. Pornography's effect was not simply a proxy for dissatisfaction with sex life or marital decision-making in 2006. In terms of substantive influence, frequency of pornography use in 2006 was the second strongest predictor of marital quality in 2012. Interaction effects revealed, however, that the negative effect of porn use on marital quality applied to husbands, but not wives. In fact, post-estimation predicted values indicated that wives who viewed pornography more frequently reported higher marital quality than those who viewed it less frequently or not at all. The implications and limitations of this study are discussed.

Parent-Child Connectedness and Long-Term Risk for Suicidal Ideation in a Nationally Representative Sample of US Adolescents.

PubMed

Kuramoto-Crawford, S Janet; Ali, Mir M; Wilcox, Holly C

2017-09-01

Few studies have addressed on the role of parent-child connectedness (PCC) on adolescents' risk for suicidal ideation from a longitudinal, developmental perspective. This study examined PCC during adolescence and risk of suicidal ideation into adulthood among a nationally representative sample of American adolescents. The study includes 13,234 adolescents aged 11-18 from the National Longitudinal Study of Adolescent to Adult Health (Add Health) who were surveyed during adolescence (1994-1995) and then again in early adulthood (2008-2009). Multinomial logistic regression estimated the association between PCC during adolescence and having ideation during the adolescence period only, in adulthood only, and in both adolescence and adulthood as compared with those without suicidal ideation. After adjusting for depressive symptoms and other parent and adolescent characteristics, adolescents in two-parent households who reported higher PCC during adolescence had lower relative risk of having ideation during adolescence alone and in both adolescence and adulthood. In mother-only households, higher mother connectedness was also associated with decreased risk of having adolescent ideation. PCC is an important modifiable target for the prevention of suicidal ideation from adolescence into adulthood.

14 CFR 25.145 - Longitudinal control.

Code of Federal Regulations, 2011 CFR

2011-01-01

... 14 Aeronautics and Space 1 2011-01-01 2011-01-01 false Longitudinal control. 25.145 Section 25.145... control. (a) It must be possible, at any point between the trim speed prescribed in § 25.103(b)(6) and..., no change in trim control, or exertion of more than 50 pounds control force (representative of the...

14 CFR 25.145 - Longitudinal control.

Code of Federal Regulations, 2012 CFR

2012-01-01

... 14 Aeronautics and Space 1 2012-01-01 2012-01-01 false Longitudinal control. 25.145 Section 25.145... control. (a) It must be possible, at any point between the trim speed prescribed in § 25.103(b)(6) and..., no change in trim control, or exertion of more than 50 pounds control force (representative of the...

Conduct, Biological Factors and Adult Delinquency in a Longitudinal Perspective.

ERIC Educational Resources Information Center

Magnusson, David

In the course of a longitudinal research program conducted in Sweden, data were being collected on biological and psychological aspects of individual functioning and on environmental factors for a fairly large representative sample (approximately 1,000) of Swedish males and females between 10 and 27 years of age. Based on data from the…

Longitudinal variability of complexities associated with equatorial electrojet

NASA Astrophysics Data System (ADS)

Rabiu, A. B.; Ogunjo, S. T.; Fuwape, I. A.

2017-12-01

Equatorial electrojet indices obtained from ground based magnetometers at 6 representative stations across the magnetic equatorial belt for the year 2009 (mean annual sunspot number Rz = 3.1) were treated to nonlinear time series analysis technique to ascertain the longitudinal dependence of the chaos/complexities associated with the phenomena. The selected stations were along the magnetic equator in the South American (Huancayo, dip latitude -1.80°), African (Ilorin, dip latitude -1.82°; Addis Ababa, dip latitude - 0.18°), and Philippine (Langkawi, dip latitude -2.32°; Davao, dip latitude -1.02°; Yap, dip latitude -1.49°) sectors. The non-linear quantifiers engaged in this work include: Recurrence rate, determinism, diagonal line length, entropy, laminarity, Tsallis entropy, Lyapunov exponent and correlation dimension. Ordinarily the EEJ was found to undergo variability from one longitudinal representative station to another, with the strongest EEJ of about 192.5 nT at the South American axis at Huancayo. The degree of complexity in the EEJ was found to vary qualitatively from one sector to another. Probable physical mechanisms responsible for longitudinal variability of EEJ strength and its complexities were highlighted.

Getting older, feeling less? A cross-sectional and longitudinal investigation of developmental patterns in experiential well-being

PubMed Central

Hudson, Nathan W.; Lucas, Richard E.; Donnellan, M. Brent

2016-01-01

A large body of previous research suggests that people’s global evaluations of their well-being tend to increase as a function of age. Fewer studies, however, have examined the extent to which people’s in vivo experiences of well-being (e.g., felt emotions) vary as a function of age—and the existing findings are mixed. The present study used an approximately nationally representative sample of more than 2,500 Germans to evaluate developmental patterns in both experiential and global well-being using cross-sectional and longitudinal analyses. The cross-sectional and longitudinal findings converged on the idea that affect—whether positive or negative, global or experiential—decreases as a function of age and time. In contrast, life satisfaction appears to remain consistent, or perhaps decline across midlife before rebounding in old age. These findings suggest that affective well-being may develop in a nuanced way across adulthood: Negative affect appears to ebb with age—but so does positive affect. PMID:27929340

Co-occurrences Between Adolescent Substance Use and Academic Performance: School Context Inuences a Multilevel-Longitudinal Perspective

PubMed Central

Andrade, Fernando H.

2014-01-01

A growing body of literature has linked substance use and academic performance exploring substance use as a predictor of academic performance or vice versa. This study uses a different approach conceptualizing substance use and academic performance as parallel outcomes and exploring two topics: its multilevel-longitudinal association and school contextual effects on both outcomes. Using multilevel Confirmatory Factor Analysis and multilevel-longitudinal analyses, the empirical estimates relied on 7843 students nested in 114 schools (Add Health study). The main finding suggests that the correlation between substance use and academic performance was positive at the school level in contraposition to the negative relationship at the individual level. Additional findings suggest a positive effect of a school risk factor on substance use and a positive effect of academic pressure on academic performance. These findings represent a contribution to our understanding of how schools could affect the relationship between academic performance and substance use. PMID:25057764

A study of the birth weight-obesity relation using a longitudinal cohort and sibling and twin pairs.

PubMed

The, Natalie S; Adair, Linda S; Gordon-Larsen, Penny

2010-09-01

Sibling and twin study designs provide control for confounding factors that are typically unmeasured in traditional cohort studies. Using nationally representative data from the National Longitudinal Study of Adolescent Health collected at 3 visits during 1994-2002, the authors evaluated the longitudinal association between birth weight and later obesity in a traditional cohort study (n = 13,763; ages 11-21 years at baseline), controlling for sex, age, race/ethnicity, and parental education. Among persons with a nonobese mother, high birth weight (>4 kg) participants were more likely than normal birth weight (>/=2.5-

Identifying Stable Variants of Callous-Unemotional Traits: A Longitudinal Study of At-Risk Girls

ERIC Educational Resources Information Center

Goulter, Natalie; Kimonis, Eva R.; Hawes, Samuel W.; Stepp, Stephanie; Hipwell, Alison E.

2017-01-01

Callous-unemotional (CU) traits have proven important for designating children and adolescents showing a pattern of particularly severe, stable, and aggressive antisocial behaviors (Frick, Ray, Thornton, & Kahn, 2014). Individuals with secondary CU traits represent a subpopulation that are distinguished from those with primary CU traits by…

Associations between Toddler-Age Communication and Kindergarten-Age Self-Regulatory Skills

ERIC Educational Resources Information Center

Aro, Tuija; Laakso, Marja-Leena; Määttä, Sira; Tolvanen, Asko; Poikkeus, Anna-Maija

2014-01-01

Purpose: In this study, the authors aimed at gaining understanding on the associations of different types of early language and communication profiles with later self-regulation skills by using longitudinal data from toddler age to kindergarten age. Method: Children with early language profiles representing expressive delay, broad delay (i.e.,…

Multiple Trajectories of Successful Aging of Older and Younger Cohorts

ERIC Educational Resources Information Center

Hsu, Hui-Chuan; Jones, Bobby L.

2012-01-01

Purpose: The purpose of this study was to apply group-based trajectory analysis to identify multiple successful aging trajectories by multiple indicators and to examine the factors related to successful aging among the elderly population in Taiwan. Design and Methods: Nation-representative longitudinal data collected from 1993 to 2007 and…

Prevalence and Correlates of Educational Intervention Utilization among Children with Autism Spectrum Disorder

ERIC Educational Resources Information Center

Bilaver, Lucy A.; Cushing, Lisa S.; Cutler, Ann T.

2016-01-01

This study examined the prevalence and correlates of educational intervention utilization among U.S. preschool aged children with autism spectrum disorder (ASD) prior to recent policy changes. The analysis was based on a nationally representative longitudinal survey of children receiving special education services during the 2003-2004 school year.…

Participation in Learning and Wellbeing among Older Adults

ERIC Educational Resources Information Center

Jenkins, Andrew

2011-01-01

The objective of this research was to identify the effects of participation in learning on the subjective wellbeing of older adults. Data were from the English Longitudinal Study of Ageing (ELSA), a large-scale, nationally representative survey of those aged 50 and above. The survey contains several wellbeing measures and information on three…

Men among Boys: The Characteristics, Qualifications and Academic Impact of Male Kindergarten Teachers in America

ERIC Educational Resources Information Center

Rose, Jason

2009-01-01

This research examined the influence of teacher gender and teacher gender-related characteristics on student reading achievement during the kindergarten year. Using a nationally representative sample of male and female kindergarten teachers and their students collected as part of the Early Childhood Longitudinal Study, Kindergarten Class of…

Measuring the Early Adulthood Outcomes of Young Adults with Disabilities: Developing Constructs Using NLTS2 Data

ERIC Educational Resources Information Center

Shogren, Karrie A.; Shaw, Leslie A.; Little, Todd D.

2016-01-01

Secondary data analysis was used to develop and examine disability-related differences in outcome constructs from the National Longitudinal Transition Study-2. Findings suggest that outcome constructs could be created that represented key elements of quality of life domains including social relationships, financial independence, financial…

Measuring the Early Adulthood Outcomes of Young Adults with Disabilities: Developing Constructs Using NLTS2 Data

ERIC Educational Resources Information Center

Shogren, Karrie A.; Shaw, Leslie A.; Little, Todd D.

2016-01-01

Secondary data analysis was used to develop and examine disability-related differences in outcome constructs from the National Longitudinal Transition Study-2 (NLTS2). Findings suggest that outcome constructs could be created that represented key elements of quality of life domains including social relationships, financial independence, financial…

Joint Book Reading and Receptive Vocabulary: A Parallel Process Model

ERIC Educational Resources Information Center

Meng, Christine

2016-01-01

The purpose of the present study was to understand the reciprocal, bidirectional longitudinal relation between joint book reading and English receptive vocabulary. To address the research goals, a nationally representative sample of Head Start children, the Head Start Family and Child Experiences Survey (2003 cohort), was used for analysis. The…

Data Tables for FACES 2006: A Year in Head Start Report. ACF-ORPRE Report

ERIC Educational Resources Information Center

Hulsey, Lara; Aikens, Nikki; Xue, Yange; Tarullo, Louisa; West, Jerry

2010-01-01

The Head Start Family and Child Experiences Survey (FACES) was first launched in 1997 as a periodic longitudinal study of program performance. Successive nationally representative samples of Head Start children, their families, classrooms, and programs provide descriptive information on the population served; staff qualifications, credentials,…

The Perceived Benefits of Paid Employment to Women in Working Class Jobs.

ERIC Educational Resources Information Center

Walshok, Mary Lindenstein

A two-year longitudinal study of 200 working women in California urban areas represents an effort to understand the processes by which specific interests and commitments to paid employment develop. Data from intensive personal interviews with women in traditional and nontraditional occupations should indicate factors which facilitate the entry of…

New Clues to Reaching Very Young Children and Families in Rural America

ERIC Educational Resources Information Center

Grace, Cathy; Shores, Elizabeth F.; Zaslow, Martha; Brown, Brett; Aufseeser, Dena

2006-01-01

The National Center for Rural Early Childhood Learning Initiatives (Rural Early Childhood), a research program of the Mississippi State University Early Childhood Institute, and Child Trends analyzed data from two nationally representative samples of young children being followed in the Early Childhood Longitudinal Study by the National Center for…

Role of Gender and Linguistic Diversity in Word Decoding Development

ERIC Educational Resources Information Center

Verhoeven, Ludo; van Leeuwe, Jan

2011-01-01

The purpose of the present study was to investigate the role of gender and linguistic diversity in the growth of Dutch word decoding skills throughout elementary school for a representative sample of children living in the Netherlands. Following a longitudinal design, the children's decoding abilities for (1) regular CVC words, (2) complex…

Choice in a World of New School Types

ERIC Educational Resources Information Center

Butler, J. S.; Carr, Douglas A.; Toma, Eugenia F.; Zimmer, Ron

2013-01-01

As school choice options have evolved over recent years, it is important to understand what family and school factors are associated with the enrollment decisions families make. Use of restricted-access data from the Early Childhood Longitudinal Study allowed us to identify household location from a nationally representative sample of students and…

Adolescents' Educational Outcomes: Racial and Ethnic Variations in Peer Network Importance

ERIC Educational Resources Information Center

Goza, Franklin; Ryabov, Igor

2009-01-01

Little attention has been paid to the role of peer social capital in the school context, especially as a predictor of adolescents' academic outcomes. This study uses a nationally representative (N = 13,738, female = 51%), longitudinal sample and multilevel models to examine how peer networks impact educational achievement and attainment. Results…

The Changing World View of Minority Migrants in an Urban Setting.

ERIC Educational Resources Information Center

Shannon, Lyle W.

A series of "world view" or value orientation questions were utilized in generating scale scores that sharply differentiated representative samples of Mexican Americans (280), Negroes (280), and Anglos (413) in a longitudinal study. The original interviews were conducted in 1959, 1960, and 1961. In 1971, seventy-four percent of the original…

The Effects of Purpose Orientations on Recent High School Graduates' College Application Decisions

ERIC Educational Resources Information Center

Sharma, Gitima; Kim, Jungnam; Bryan, Julia

2017-01-01

Using the 2002 Educational Longitudinal Study database, the authors examined the different types of purpose orientations amongst a nationally representative sample of adolescents and the effect of these purpose orientations on high school graduates' college application decisions. Results indicated four types of purpose orientations: career,…

Math Grades and Intrinsic Motivation in Elementary School: A Longitudinal Investigation of Their Association

ERIC Educational Resources Information Center

Weidinger, Anne F.; Steinmayr, Ricarda; Spinath, Birgit

2017-01-01

Background: It is often argued that the negative development of intrinsic motivation in elementary school strongly depends on the presence of school grades because grades represent extrinsic consequences and achievement feedback that are supposed to influence intrinsically motivated behaviour. However, only a few studies have tested this…

Locus of Control and Academic Achievement: Integrating Social Learning Theory and Expectancy-Value Theory

ERIC Educational Resources Information Center

Youse, Keith Edward

2012-01-01

The current study examines predictors of math achievement and college graduation by integrating social learning theory and expectancy-value theory. Data came from a nationally-representative longitudinal database tracking 12,144 students over twelve years from 8th grade forward. Models for math achievement and college graduation were tested…

Exploring the Relationship between Student Approaches to Learning and Reading Achievement at the School Level

ERIC Educational Resources Information Center

Musu-Gillette, Lauren E.; Barofsky, Meryl Y.; List, Alexandra

2015-01-01

Using the Early Childhood Longitudinal Study, Kindergarten Cohort of 1998 (ECLS-K, 98), a nationally representative sample of kindergarteners in the United States, we investigated the relationship between approaches to learning and spring reading achievement with particular emphasis on classroom and school-level differences. We employed…

The Value of Reanalysis: TV Viewing and Attention Problems

ERIC Educational Resources Information Center

Foster, E. Michael; Watkins, Stephanie

2010-01-01

Using data from the National Longitudinal Survey of Youth (N = 1,159), this study reexamines the link between maternal reports of television viewing at ages 1 and 3 and attention problems at age 7. This work represents a reanalysis and extension of recent research suggesting young children's television viewing causes subsequent attention problems.…

Full-Time Ability Grouping of Gifted Students: Impacts on Social Self-Concept and School-Related Attitudes

ERIC Educational Resources Information Center

Vogl, Katharina; Preckel, Franzis

2014-01-01

Positive socioemotional outcomes and developments represent important educational goals. Full-time ability grouping of gifted students has been criticized for potentially detrimental socioemotional effects. Therefore, in the present longitudinal study, we investigated whether or not social self-concepts and school-related attitudes and beliefs are…

Inclusion and the Practice of Repeating Kindergarten in Australia

ERIC Educational Resources Information Center

Daniel, Graham R.; Wang, Cen

2017-01-01

International evidence indicates there may be little or no academic benefit for children who are retained, and the possibility of negative long term socio-emotional outcomes for these children. Drawing on data from the nationally representative Longitudinal Study of Australian Children (n = 4464), this paper provides an Australian perspective on…

Parental Depression and Child Outcomes: The Mediating Effects of Abuse and Neglect

ERIC Educational Resources Information Center

Mustillo, Sarah A.; Dorsey, Shannon; Conover, Kate; Burns, Barbara J.

2011-01-01

Using longitudinal data on 1,813 children and parents from a nationally representative child-welfare sample, National Survey of Child and Adolescent Well-Being (NSCAW), this study investigated physically abusive and neglectful parenting as mediating the effects of parent depression on child mental health by developmental stage. Findings from…

Kindergarten Children's Executive Functions Predict Their Second-Grade Academic Achievement and Behavior

ERIC Educational Resources Information Center

Morgan, Paul L.; Farkas, George; Hillemeier, Marianne M.; Pun, Wik Hung; Maczuga, Steve

2018-01-01

Whether and to what extent kindergarten children's executive functions (EF) constitute promising targets of early intervention is currently unclear. This study examined whether kindergarten children's EF predicted their second-grade academic achievement and behavior. This was done using (a) a longitudinal and nationally representative sample (N =…

Predictors of Academic Achievement and Retention among College Freshmen: A Longitudinal Study

ERIC Educational Resources Information Center

DeBerard, M. Scott; Spielmans, Glen I.; Julka, Deana L.

2004-01-01

The freshman year represents a stressful transition for college students. Despite a multitude of social, academic, and emotional stressors, most college students successfully cope with a complex new life role and achieve academic success. Other students are less able to successfully manage this transition and decide to leave higher education…

The Relationship between Marijuana Use and Intimate Partner Violence in a Nationally Representative, Longitudinal Sample

ERIC Educational Resources Information Center

Reingle, Jennifer M.; Staras, Stephanie A. S.; Jennings, Wesley G.; Branchini, Jennifer; Maldonado-Molina, Mildred M.

2012-01-01

Intimate partner violence is a significant public health problem, as these behaviors have been associated with a number of negative health outcomes including illicit drug use, physical injury, chronic pain, sexually transmitted diseases, depression, and posttraumatic stress disorder. The current study examined the association between marijuana use…

Visual Search Load Effects on Age-Related Cognitive Decline: Evidence From the Yakumo Longitudinal Study.

PubMed

Hatta, Takeshi; Kato, Kimiko; Hotta, Chie; Higashikawa, Mari; Iwahara, Akihiko; Hatta, Taketoshi; Hatta, Junko; Fujiwara, Kazumi; Nagahara, Naoko; Ito, Emi; Hamajima, Nobuyuki

2017-01-01

The validity of Bucur and Madden's (2010) proposal that an age-related decline is particularly pronounced in executive function measures rather than in elementary perceptual speed measures was examined via the Yakumo Study longitudinal database. Their proposal suggests that cognitive load differentially affects cognitive abilities in older adults. To address their proposal, linear regression coefficients of 104 participants were calculated individually for the digit cancellation task 1 (D-CAT1), where participants search for a given single digit, and the D-CAT3, where they search for 3 digits simultaneously. Therefore, it can be conjectured that the D-CAT1 represents primarily elementary perceptual speed and low-visual search load task. whereas the D-CAT3 represents primarily executive function and high-visual search load task. Regression coefficients from age 65 to 75 for the D-CAT3 showed a significantly steeper decline than that for the D-CAT1, and a large number of participants showed this tendency. These results support the proposal by Brcur and Madden (2010) and suggest that the degree of cognitive load affects age-related cognitive decline.

Immigrant employment and earnings growth in Canada and the USA: evidence from longitudinal data

PubMed Central

Kaushal, Neeraj; Lu, Yao; Denier, Nicole; Wang, Julia Shu-Huah; Trejo, Stephen J.

2016-01-01

We study the short-term trajectories of employment, hours worked, and real wages of immigrants in Canada and the U.S. using nationally representative longitudinal datasets covering 1996–2008. Models with person fixed effects show that on average immigrant men in Canada do not experience any relative growth in these three outcomes compared to men born in Canada. Immigrant men in the U.S., on the other hand, experience positive annual growth in all three domains relative to U.S. born men. This difference is largely on account of low-educated immigrant men, who experience faster or longer periods of relative growth in employment and wages in the U.S. than in Canada. We further compare longitudinal and cross-sectional trajectories and find that the latter over-estimate wage growth of earlier arrivals, presumably reflecting selective return migration. PMID:28138209

Physical education and academic achievement in elementary school: data from the early childhood longitudinal study.

PubMed

Carlson, Susan A; Fulton, Janet E; Lee, Sarah M; Maynard, L Michele; Brown, David R; Kohl, Harold W; Dietz, William H

2008-04-01

We examined the association between time spent in physical education and academic achievement in a longitudinal study of students in kindergarten through fifth grade. We used data from the Early Childhood Longitudinal Study, Kindergarten Class of 1998 to 1999, which employed a multistage probability design to select a nationally representative sample of students in kindergarten (analytic sample = 5316). Time spent in physical education (minutes per week) was collected from classroom teachers, and academic achievement (mathematics and reading) was scored on an item response theory scale. A small but significant benefit for academic achievement in mathematics and reading was observed for girls enrolled in higher amounts (70-300 minutes per week) of physical education (referent: 0-35 minutes per week). Higher amounts of physical education were not positively or negatively associated with academic achievement among boys. Among girls, higher amounts of physical education may be associated with an academic benefit. Physical education did not appear to negatively affect academic achievement in elementary school students. Concerns about adverse effects on achievement may not be legitimate reasons to limit physical education programs.

Determining the longitudinal validity and meaningful differences in HRQL of the PedsQL™ Sickle Cell Disease Module.

PubMed

Panepinto, Julie A; Paul Scott, J; Badaki-Makun, Oluwakemi; Darbari, Deepika S; Chumpitazi, Corrie E; Airewele, Gladstone E; Ellison, Angela M; Smith-Whitley, Kim; Mahajan, Prashant; Sarnaik, Sharada A; Charles Casper, T; Cook, Larry J; Leonard, Julie; Hulbert, Monica L; Powell, Elizabeth C; Liem, Robert I; Hickey, Robert; Krishnamurti, Lakshmanan; Hillery, Cheryl A; Brousseau, David C

2017-06-12

Detecting change in health status over time and ascertaining meaningful changes are critical elements when using health-related quality of life (HRQL) instruments to measure patient-centered outcomes. The PedsQL™ Sickle Cell Disease module, a disease specific HRQL instrument, has previously been shown to be valid and reliable. Our objectives were to determine the longitudinal validity of the PedsQL™ Sickle Cell Disease module and the change in HRQL that is meaningful to patients. An ancillary study was conducted utilizing a multi-center prospective trial design. Children ages 4-21 years with sickle cell disease admitted to the hospital for an acute painful vaso-oclusive crisis were eligible. Children completed HRQL assessments at three time points (in the Emergency Department, one week post-discharge, and at return to baseline (One to three months post-discharge). The primary outcome was change in HRQL score. Both distribution (effect size, standard error of measurement (SEM)) and anchor (global change assessment) based methods were used to determine the longitudinal validity and meaningful change in HRQL. Changes in HRQL meaningful to patients were identified by anchoring the change scores to the patient's perception of global improvement in pain. Moderate effect sizes (0.20-0.80) were determined for all domains except the Communication I and Cognitive Fatigue domains. The value of 1 SEM varied from 3.8-14.6 across all domains. Over 50% of patients improved by at least 1 SEM in Total HRQL score. A HRQL change score of 7-10 in the pain domains represented minimal perceived improvement in HRQL and a HRQL change score of 18 or greater represented moderate to large improvement. The PedsQL™ Sickle Cell Disease Module is responsive to changes in HRQL in patients experiencing acute painful vaso-occlusive crises. The study data establish longitudinal validity and meaningful change parameters for the PedsQL™ Sickle Cell Disease Module. ClinicalTrials.gov (study identifier: NCT01197417 ). Date of registration: 08/30/2010.

NLS Handbook, 2005. National Longitudinal Surveys

ERIC Educational Resources Information Center

Bureau of Labor Statistics, 2006

2006-01-01

The National Longitudinal Surveys (NLS), sponsored by the U.S. Bureau of Labor Statistics (BLS), are a set of surveys designed to gather information at multiple points in time on the labor market experiences of groups of men and women. Each of the cohorts has been selected to represent all people living in the United States at the initial…

Evaluation of "The First Tee" in Promoting Positive Youth Development: Group Comparisons and Longitudinal Trends

ERIC Educational Resources Information Center

Weiss, Maureen R.; Bolter, Nicole D.; Kipp, Lindsay E.

2016-01-01

Purpose: This manuscript represents the 3rd in a series of articles documenting our longitudinal evaluation of "The First Tee," a physical activity-based youth development program that uses golf as a vehicle for teaching life skills and enhancing developmental outcomes. Previous phases of our project: (a) established initial data-based…

Comorbid Fluency Difficulties in Reading and Math: Longitudinal Stability across Early Grades

ERIC Educational Resources Information Center

Koponen, Tuire; Aro, Mikko; Poikkeus, Anna-Maija; Niemi, Pekka; Lerkkanen, Marja-Kristiina; Ahonen, Timo; Nurmi, Jari-Erik

2018-01-01

We examined the prevalence of comorbidity of dysfluent reading and math skills longitudinally in a representative sample (N = 1,928) and the stability of comorbid and single difficulties from first to fourth grades. The findings indicated that half the children who showed very low performance in one skill also evidenced low or very low performance…

Conduct problems, IQ, and household chaos: a longitudinal multi-informant study

PubMed Central

Deater-Deckard, Kirby; Mullineaux, Paula Y.; Beekman, Charles; Petrill, Stephen A.; Schatschneider, Chris; Thompson, Lee A.

2010-01-01

Background We tested the hypothesis that household chaos would be associated with lower child IQ and more child conduct problems concurrently and longitudinally over two years while controlling for housing conditions, parent education/IQ, literacy environment, parental warmth/negativity, and stressful events. Methods The sample included 302 families with same-sex twins (58% female) in Kindergarten/1st grade at the first assessment. Parents’ and observers’ ratings were gathered, with some collected over a two-year period. Results Chaos varied widely. There was substantial mother–father agreement and longitudinal stability. Chaos covaried with poorer housing conditions, lower parental education/IQ, poorer home literacy environment, higher stress, higher negativity and lower warmth. Chaos statistically predicted lower IQ and more conduct problems, beyond the effects of other home environment factors. Conclusions Even with other home environment factors controlled, higher levels of chaos were linked concurrently with lower child IQ, and concurrently and longitudinally with more child conduct problems. Parent self-reported chaos represents an important aspect of housing and family functioning, with respect to children’s cognitive and behavioral functioning. PMID:19527431

The longitudinal relation between peer violent victimization and delinquency: results from a national representative sample of u.s. Adolescents.

PubMed

Jackson, Corrie L; Hanson, Rochelle F; Amstadter, Ananda B; Saunders, Benjamin E; Kilpatrick, Dean G

2013-05-01

Using a nationally representative sample of adolescents from the United States aged 12 to 17 years (Wave 1, n = 3,614; Wave 2, n = 2,511), this study examined (a) demographic and descriptive information about peer violent victimization (PVV); and (b) the longitudinal relation between a history of PVV and delinquency. Results indicated that 12.4% of adolescents reported lifetime exposure to PVV, and many of these adolescents with a previous history of PVV also reported exposure to other forms of interpersonal violence, with witnessing community/school violence being the most commonly endorsed exposure category. Males, older adolescents, African American adolescents, and adolescents from low-income households were significantly more likely to endorse PVV. Regardless of the victim's gender, the majority of the perpetrators were male. After controlling for exposure to other forms of interpersonal violence and a history of delinquency, PVV was related to subsequent delinquency. Implications for policy, practice, and future research are discussed.

The Longitudinal Relation Between Peer Violent Victimization and Delinquency: Results From a National Representative Sample of U.S. Adolescents

PubMed Central

Jackson, Corrie L.; Hanson, Rochelle F.; Amstadter, Ananda B.; Saunders, Benjamin E.; Kilpatrick, Dean G.

2014-01-01

Using a nationally representative sample of adolescents from the United States aged 12 to 17 years (Wave 1, n = 3,614; Wave 2, n = 2,511), this study examined (a) demographic and descriptive information about peer violent victimization (PVV); and (b) the longitudinal relation between a history of PVV and delinquency. Results indicated that 12.4% of adolescents reported lifetime exposure to PVV, and many of these adolescents with a previous history of PVV also reported exposure to other forms of interpersonal violence, with witnessing community/school violence being the most commonly endorsed exposure category. Males, older adolescents, African American adolescents, and adolescents from low-income households were significantly more likely to endorse PVV. Regardless of the victim's gender, the majority of the perpetrators were male. After controlling for exposure to other forms of interpersonal violence and a history of delinquency, PVV was related to subsequent delinquency. Implications for policy, practice, and future research are discussed. PMID:23266995

Community College Students' Persistence and Goal Attainment: A 5-Year Longitudinal Study. AIR Professional File, Number 55, Spring 1995.

ERIC Educational Resources Information Center

Conklin, Karen A.

A representative sample of first-time, full-time freshmen attending 17 Kansas community colleges in fall 1985 were tracked through spring 1990. Eight separate surveys were mailed to between 50 and 100 freshmen at each college, receiving a final response rate of 82.8%. Study findings included the following: (1) 71% of the respondents who initially…

Teens and Their Parents in the 21st Century: An Examination of Trends in Teen Behavior and the Role of Parental Involvement.

ERIC Educational Resources Information Center

Council of Economic Advisers, Washington, DC.

This report by the Council of Economic Advisers analyzes key trends in teen behavior, and investigates the role of parents' involvement in their teenagers' lives. The report uses data from the National Longitudinal Study of Adolescent Health, a study of a nationally representative sample of seventh through twelfth graders, to examine the…

A Longitudinal Study of Selected Impacts of the School District Finance and Quality Performance Accreditation (SDFQPA) Act on Representative Kansas School Districts, 2002-2011

ERIC Educational Resources Information Center

Jordan, Brian C.

2012-01-01

Information gained from the present study should provide important policy insights into whether adjustments to the School District Finance and Quality Performance Accreditation (SDFQPA) Act funding formula have supported the original goal behind SDFQPA, which was to provide more equal funding to public elementary and secondary pupils in Kansas.…

A Longitudinal Study of Selected Impacts of the School District Finance and Quality Performance Accreditation (SSDFQPA) Act on Representative Kansas School Districts, 2002-2011

ERIC Educational Resources Information Center

Jordan, Brian C.

2012-01-01

Information gained from the present study should provide important policy insights into whether adjustments to the School District Finance and Quality Performance Accreditation (SDFQPA) Act funding formula have supported the original goal behind SDFQPA, which was to provide more equal funding to public elementary and secondary pupils in Kansas.…

A Repeated Trajectory Class Model for Intensive Longitudinal Categorical Outcome

PubMed Central

Lin, Haiqun; Han, Ling; Peduzzi, Peter N.; Murphy, Terrence E.; Gill, Thomas M.; Allore, Heather G.

2014-01-01

This paper presents a novel repeated latent class model for a longitudinal response that is frequently measured as in our prospective study of older adults with monthly data on activities of daily living (ADL) for more than ten years. The proposed method is especially useful when the longitudinal response is measured much more frequently than other relevant covariates. The repeated trajectory classes represent distinct temporal patterns of the longitudinal response wherein an individual’s membership in the trajectory classes may renew or change over time. Within a trajectory class, the longitudinal response is modeled by a class-specific generalized linear mixed model. Effectively, an individual may remain in a trajectory class or switch to another as the class membership predictors are updated periodically over time. The identification of a common set of trajectory classes allows changes among the temporal patterns to be distinguished from local fluctuations in the response. An informative event such as death is jointly modeled by class-specific probability of the event through shared random effects. We do not impose the conditional independence assumption given the classes. The method is illustrated by analyzing the change over time in ADL trajectory class among 754 older adults with 70500 person-months of follow-up in the Precipitating Events Project. We also investigate the impact of jointly modeling the class-specific probability of the event on the parameter estimates in a simulation study. The primary contribution of our paper is the periodic updating of trajectory classes for a longitudinal categorical response without assuming conditional independence. PMID:24519416

A population-based longitudinal study of risk factors for suicide attempts in major depressive disorder.

PubMed

Bolton, James M; Pagura, Jina; Enns, Murray W; Grant, Bridget; Sareen, Jitender

2010-10-01

No longitudinal study has examined risk factors for future suicide attempts in major depressive disorder in a nationally representative sample. The objective of this study was to investigate baseline sociodemographic characteristics, comorbid mental disorders, specific depressive symptoms, and previous suicidal behavior as potential risk factors for suicide attempts at 3 years follow-up. Data came from the national epidemiologic survey on alcohol and related conditions (NESARC), a large nationally representative longitudinal survey of mental illness in adults [Wave 1 (2001-2002); Wave 2 (2004-2005) n=34,653]. Logistic regression examined associations between risk factors present at Wave 1 and suicide attempts at Wave 2 (n=169) among individuals with major depressive disorder at baseline assessment (n=6004). Risk factors for incident suicide attempts at Wave 2 (n=63) were identified among those with major depressive disorder at Wave 1 and no lifetime history of suicide attempts (n=5170). Results revealed specific comorbid anxiety, personality, and substance use disorders to be associated with incident suicide attempts at Wave 2. Comorbid borderline personality disorder was strongly associated with suicide attempts in all models. Several comorbid disorders were strongly associated with suicide attempts at Wave 2 even after adjusting for previous suicidal behavior, notably posttraumatic stress disorder (adjusted odds ratio (AOR)=2.20; 95% confidence interval (95% CI) 1.27-3.83) and dependent personality disorder (AOR=4.43; 95% CI 1.93-10.18). These findings suggest that mental illness comorbidity confers an increased risk of future suicide attempts in major depressive disorder that is not solely accounted for by past suicidal behavior.

Pathological Correlates of Cognitive Impairment in The University of Manchester Longitudinal Study of Cognition in Normal Healthy Old Age.

PubMed

Robinson, Andrew C; Davidson, Yvonne S; Horan, Michael A; Pendleton, Neil; Mann, David M A

2018-01-01

The neuropathological changes responsible for cognitive impairment and dementia remain incompletely understood. Longitudinal studies with a brain donation end point allow the opportunity to examine relationships between cognitive status and neuropathology. We report on the first 97 participants coming to autopsy with sufficient clinical information from The University of Manchester Longitudinal Study of Cognition in Normal Healthy Old Age. This study began in 1983 and recruited 6,542 healthy individuals between 1983 and 1994, 312 of whom consented to brain donation. Alzheimer-type pathology was common throughout the cohort and generally correlated well with cognitive status. However, there was some overlap between cognitive status and measures of Alzheimer pathology with 26% of cognitively intact participants reaching either CERAD B or C, 11% reaching Thal phase 4 or 5, and 29% reaching Braak stage III- VI. Cerebral amyloid angiopathy(CAA), α-synuclein, and TDP-43 pathology was less common, but when present correlated well with cognitive status. Possession of APOEɛ4 allele(s) was associated with more severe Alzheimer-type and CAA pathology and earlier death, whereas possession of APOEɛ2 allele(s) had no effect on pathology but was more common in cognitively intact individuals. The University of Manchester Longitudinal Study of Cognition in Normal Healthy Old Age cohort is pathologically representative when compared with similar studies. Cognitive impairment in life correlates strongly with all pathologies examined and the APOE status of an individual can affect pathology severity and longevity.

Developmental Differences in Parenting Behavior: Comparing Adolescent, Emerging Adult, and Adult Mothers

ERIC Educational Resources Information Center

Lewin, Amy; Mitchell, Stephanie J.; Ronzio, Cynthia R.

2013-01-01

The nationally representative Early Childhood Longitudinal Study-Birth cohort data set was used to compare parenting behaviors of adolescent mothers (less than 19 years old), emerging adult mothers (19-25 years old), and adult mothers (greater than 25 years old) when their children were 2 years old. Regression models controlling for socioeconomic…

Reported Accommodations and Supports Provided to Secondary and Postsecondary Students with Disabilities: National Perspective

ERIC Educational Resources Information Center

Newman, Lynn A.; Madaus, Joseph W.

2015-01-01

There is a dearth of information on specific accommodations used by students with disabilities at the secondary and postsecondary levels. Using data from the National Longitudinal Transition Study-2, researchers examined a nationally representative cohort of 3,190 students with disabilities who reported that they had ever enrolled in a…

Sex and Race Disparities in Health: Cohort Variations in Life Course Patterns

ERIC Educational Resources Information Center

Yang, Yang; Lee, Linda C.

2009-01-01

This study assesses changes in sex and race disparities in health over the life course and across cohorts by conducting growth curve analyses of nationally representative longitudinal data that spans 15 years. It finds that changes in disparities in depressive symptoms, disability and self-assessments of health across the life course are…

Comparing the Determinants of Persistence for First-Generation and Continuing-Generation Students

ERIC Educational Resources Information Center

Martin Lohfink, Mandy; Paulsen, Michael B.

2005-01-01

In this study we examined and compared the determinants of first-to-second-year persistence for 1,167 first-generation and 3,017 continuing-generation students at four-year institutions, using data from the Beginning Postsecondary Students Longitudinal Survey (Wine, et al., 2002). Because first-generation students are over represented in the most…

Who Receives Speech/Language Services by 5 Years of Age in the United States?

ERIC Educational Resources Information Center

Morgan, Paul L.; Hammer, Carol Scheffner; Farkas, Geroge; Hillemeier, Marianne M.; Maczuga, Steve; Cook, Michael; Morano, Stephanie

2016-01-01

Purpose: We sought to identify factors predictive of or associated with receipt of speech/language services during early childhood. We did so by analyzing data from the Early Childhood Longitudinal Study-Birth Cohort (ECLS-B; Andreassen & Fletcher, 2005), a nationally representative dataset maintained by the U.S. Department of Education. We…

Word Decoding Development in Incremental Phonics Instruction in a Transparent Orthography

ERIC Educational Resources Information Center

Schaars, Moniek M.; Segers, Eliane; Verhoeven, Ludo

2017-01-01

The present longitudinal study aimed to investigate the development of word decoding skills during incremental phonics instruction in Dutch as a transparent orthography. A representative sample of 973 Dutch children in the first grade (M[subscript age] = 6;1, SD = 0;5) was exposed to incremental subsets of Dutch grapheme-phoneme correspondences…

Family Environment and Adolescents' Well-Being Before and After Parents' Marital Disruption: A Longitudinal Analysis.

ERIC Educational Resources Information Center

Sun, Yongmin

2001-01-01

Based on two waves of a large, nationally representative panel, this study demonstrates that even before the disruption, both male and female adolescents from families that subsequently dissolve exhibit more academic, psychological, and behavioral problems than peers whose parents remain married. Analyses also indicate females are as likely to be…

Comprehensive School Reform: A Longitudinal Study of School Improvement in One State

ERIC Educational Resources Information Center

Good, Thomas L.; Burross, Heidi Legg; McCaslin, Mary M.

2005-01-01

We report on comprehensive school reform (CSR) reform in 48 schools over 6 consecutive years. In 1998, a total of 24 schools received CSR awards to improve student achievement. Control schools were carefully matched on 26 demographic variables to form a comparison group. Students' average performance, as represented in publicly available school…

Selling College: A Longitudinal Study of American College Football Bowl Game Public Service Announcements

ERIC Educational Resources Information Center

Tobolowsky, Barbara F.; Lowery, John Wesley

2014-01-01

Using ideological analysis as a frame, researchers analyzed institutionally created commercials (PSAs) that appeared in 28 U.S. college football bowl games over a seven-year period (2003-2009) to better understand the universities' brands as represented in these advertisements. They found many common elements such as showing traditional…

Designing Instruction and Learning for Cognitively Gifted Pupils in Preschool and Primary School

ERIC Educational Resources Information Center

Mooij, Ton

2013-01-01

Young gifted children perform in the top 10% in assessments of cognitive, social, expressive or other abilities. The study first considers why, and how, cognitively gifted pupils in particular may face enforced underachievement as early as in preschool. A longitudinal multilevel model is developed to represent various types of interaction between…

Career Outcomes of STEM and Non-STEM College Graduates: Persistence in Majored-Field and Influential Factors in Career Choices

ERIC Educational Resources Information Center

Xu, Yonghong Jade

2013-01-01

Using data from a nationally representative, longitudinal survey of college graduates, this study examines student transition from college to their chosen career paths and identifies factors influencing college graduates' choosing an occupation related to ones' undergraduate major. Within the context of expanded econometric framework a wide range…

School Climate and Dropping Out of School in the Era of Accountability

ERIC Educational Resources Information Center

Kotok, Stephen; Ikoma, Sakiko; Bodovski, Katerina

2016-01-01

Using data from the High School Longitudinal Study of 2009 (HSLS:09)--a large nationally representative sample of US high school students--we employed multilevel structural equation modeling (SEM) to examine the relationship between school characteristics and the likelihood that a student will drop out of high school. We used a multifaceted…

A Nationally Representative Study of the Association between Communication Impairment at 4-5 Years and Children's Life Activities at 7-9 Years

ERIC Educational Resources Information Center

McCormack, Jane; Harrison, Linda J.; McLeod, Sharynne; McAllister, Lindy

2011-01-01

Purpose: To examine the longitudinal association between communication impairment (primary or secondary diagnosis) and children's Activities and Participation (International Classification of Functioning, Disability and Health-Children and Youth [ICF-CY]; World Health Organization [WHO], 2007). Method: Participants were 4,329 children in the…

Children's Outcomes and Program Quality in Head Start. FACES 2003 Research Brief

ERIC Educational Resources Information Center

Zill, Nicholas; Sorongon, Alberto; Kim, Kwang; Clark, Cheryl; Woolverton, Maria

2006-01-01

The Head Start Family and Child Experiences Survey (FACES) provides longitudinal data on a periodic basis on the characteristics, experiences, and outcomes of children and families served by Head Start as well as the characteristics of the Head Start programs that serve them. Each round of FACES is a study with a nationally representative sample…

Beginning Subbaccalaureate Students' Labor Market Experiences: Six Years Later in 2009. Web Tables. NCES 2012-273

ERIC Educational Resources Information Center

Ifill, Nicole; Radford, Alexandria Walton

2012-01-01

This set of Web Tables presents descriptive statistics on the spring 2009 labor market experiences of subbaccalaureate students who first entered postsecondary education in 2003-04. The Web Tables use data from the nationally representative 2004/09 Beginning Post-secondary Students Longitudinal Study (BPS:04/09), which followed a cohort of…

Examining ECLS-B: Maternal Stress and Depressive Symptoms when Raising Children with ASD

ERIC Educational Resources Information Center

Jeans, Laurie M.; Santos, Rosa Milagros; Laxman, Daniel J.; McBride, Brent A.; Dyer, W. Justin

2013-01-01

Using the Early Childhood Longitudinal Study-Birth Cohort (ECLS-B), a nationally representative data set, we examined the extent to which mothers of preschool children with and without the diagnosis of an Autism Spectrum Disorder (ASD) reported stress and depressive symptoms prior to and following diagnosis of ASD. At 4 years, approximately 100…

Cumulative, Timing-Specific, and Interactive Models of Residential Mobility and Children's Cognitive and Psychosocial Skills

ERIC Educational Resources Information Center

Coley, Rebekah Levine; Kull, Melissa

2016-01-01

Residential mobility has received notable attention in the literature, yet there remains limited consensus on how and when mobility is associated with detriments to children's development. Drawing on a nationally representative sample of 19,162 children in the Early Childhood Longitudinal Study followed from kindergarten through eighth grade, this…

Preschool Attendance and School Readiness for Children of Immigrant Mothers in the United States

ERIC Educational Resources Information Center

Lee, RaeHyuck; Han, Wen-Jui; Waldfogel, Jane; Brooks-Gunn, Jeanne

2018-01-01

We examined the associations between preschool attendance and academic school readiness at kindergarten entry among 5-year-old children of immigrant mothers in the United States using data from a US nationally representative sample (Early Childhood Longitudinal Study-Birth Cohort, N = 1650). Comparing children who were in preschool (Head Start,…

Academic Self-Concept and Achievement in Polish Primary Schools: Cross-Lagged Modelling and Gender-Specific Effects

ERIC Educational Resources Information Center

Grygiel, Pawel; Modzelewski, Michal; Pisarek, Jolanta

2017-01-01

This study reports relationships between general academic self-concept and achievement in grade 3 and grade 5. Gender-specific effects were investigated using a longitudinal, two-cycle, 3-year autoregressive cross-lagged panel design in a large, representative sample of Polish primary school pupils (N = 4,226). Analysis revealed (a) reciprocal…

The Stability of Vocational Interests from Early Adolescence to Middle Adulthood: A Quantitative Review of Longitudinal Studies

ERIC Educational Resources Information Center

Low, K. S. Douglas; Yoon, Mijung; Roberts, Brent W.; Rounds, James

2005-01-01

The present meta-analysis examined the stability of vocational interests from early adolescence (age 12) to middle adulthood (age 40). Stability was represented by rank-order and profile correlations. Interest stability remained unchanged during much of adolescence and increased dramatically during the college years (age 18-21.9), where it…

Adolescent Summer Care Arrangements and Risk for Obesity the Following School Year

ERIC Educational Resources Information Center

Mahoney, Joseph L.

2011-01-01

This longitudinal study identified common summer care arrangements for adolescents and examined whether those arrangements predicted risk for obesity (Body Mass Index (BMI) [greater than or equal to] 85th percentile for age and gender) the following school year. Participants were a nationally representative sample of 1766 adolescents ages 10-18…

Differences in Risk Factors for Suicide Attempts Among 9th and 11th Grade Youth: A Longitudinal Perspective

ERIC Educational Resources Information Center

Fried, Lise E.; Williams, Sandra; Cabral, Howard; Hacker, Karen

2013-01-01

The purpose of the study is to assess the relationship between timing of adolescent development and risk factors for suicide. Nationally representative data from the Add Health survey were used. The relationship of sociodemographic characteristics, known risk factors, and physical developmental timing and cognitive developmental style to suicide…

A National Sample of Preschoolers with Autism Spectrum Disorders: Special Education Services and Parent Satisfaction

ERIC Educational Resources Information Center

Bitterman, Amy; Daley, Tamara C.; Misra, Sunil; Carlson, Elaine; Markowitz, Joy

2008-01-01

The Pre-Elementary Education Longitudinal Study (PEELS) examines the preschool and early elementary school experiences of a nationally representative sample of 3,104 children ages 3-5 with disabilities from 2004 through 2009. This paper describes the special education and related services received by a subsample of 186 preschoolers with autism…

Homework Works If Homework Quality Is High: Using Multilevel Modeling to Predict the Development of Achievement in Mathematics

ERIC Educational Resources Information Center

Dettmers, Swantje; Trautwein, Ulrich; Ludtke, Oliver; Kunter, Mareike; Baumert, Jurgen

2010-01-01

The present study examined the associations of 2 indicators of homework quality (homework selection and homework challenge) with homework motivation, homework behavior, and mathematics achievement. Multilevel modeling was used to analyze longitudinal data from a representative national sample of 3,483 students in Grades 9 and 10; homework effects…

An Examination of the Moderating Effects of the High School Socioeconomic Context on College Enrollment

ERIC Educational Resources Information Center

Engberg, Mark E.; Wolniak, Gregory C.

2014-01-01

Drawing on a nationally representative sample of high school seniors from the Educational Longitudinal Survey of 2002 (ELS), this study examines the influence of the high school socioeconomic context on students' decisions to attend two-and four-year postsecondary institutions. The results provide evidence of resource imbalances based on…

Association of a Mixed Anxiety-Depression Syndrome and Symptoms of Major Depressive Disorder during Adolescence.

ERIC Educational Resources Information Center

Gerhardt, Cynthia A.; Compas, Bruce E.; Connor, Jennifer K.; Achenbach, Thomas M.

1999-01-01

Examined the relations between an empirically derived syndrome of Anxiety-Depression and an analogue measure of Major Depressive Disorder (MDD) in a longitudinal study of a nationally representative sample of 3,154 adolescents. Analyses indicated moderate correspondence between scores on the syndrome and symptoms of the MDD analogue. (SLD)

Status Variations in Alcohol Use among Young Adults: Results from the 1984 National Longitudinal Surveys of Youth.

ERIC Educational Resources Information Center

Crowley, Joan E.

This document gives descriptive results on alcohol use patterns among young adults from the 1984 National Longitudinal Survey of Labor Market of Youth, a survey of a large, nationally representative sample supplemented by samples of blacks, Hispanics, and economically disadvantaged non-black, non-Hispanic youth and covering the entire range of…

Employment Experience of Youths: Results from a Longitudinal Survey.

ERIC Educational Resources Information Center

Bureau of Labor Statistics, Washington, DC.

Nearly 3 out of 5 students (58 percent) who were 16 years old when the 1997-98 school year began worked for an employer at some point during the academic year. Findings were from the second round of the National Longitudinal Survey of Youth 1997, a nationally representative sample of about 9,000 young men and women born during 1980-84. Respondents…

The Longitudinal Joint Effect of Obesity and Major Depression on Work Performance Impairment

PubMed Central

Reijneveld, Sijmen A.; Penninx, Brenda W. J. H.; Schoevers, Robert A.; Bültmann, Ute

2015-01-01

Objectives. We examined the longitudinal effect of obesity, major depression, and their combination on work performance impairment (WPI). Methods. We collected longitudinal data (2004–2013) on 1726 paid employees from the Netherlands Study of Depression and Anxiety at baseline and 2-, 4-, and 6-year follow-up. We defined obesity with body mass index and waist circumference. We diagnosed major depression with the Composite International Diagnostic Interview 2.1. We assessed work performance impairment with a questionnaire for illness-associated costs. We used generalized estimating equations for modeling, and estimated interaction on the additive scale. Results. Obesity, abdominal obesity, and major depression were longitudinally associated with increased risk of high WPI. The combinations of obesity and major depression, and of abdominal obesity and major depression were associated with increased risk of high WPI (odds ratios of 2.36 [95% confidence interval = 1.61, 3.44] and 1.88 [95% confidence interval = 1.40, 2.53], respectively), but the relative excess risks attributable to interaction were nonsignificant. Conclusions. The longitudinal joint effect of obesity and major depression on high WPI implies that obesity intervention may be more beneficial for individuals with major depression than those without regarding risk of high WPI, if confirmed in a large, representative sample. PMID:25790401

Household Food Insecurity and Children's Behaviour Problems: New Evidence from a Trajectories-Based Study

PubMed Central

Huang, Jin; Vaughn, Michael G.

2016-01-01

This study examined the association between household food insecurity (insufficient access to adequate and nutritious food) and trajectories of externalising and internalising behaviour problems in children from kindergarten to fifth grade using longitudinal data from the Early Childhood Longitudinal Study—Kindergarten Cohort (ECLS-K), a nationally representative study in the USA. Household food insecurity was assessed using the eighteen-item standard food security scale, and children's behaviour problems were reported by teachers. Latent growth curve analysis was conducted on 7,348 children in the ECLS-K, separately for boys and girls. Following adjustment for an extensive array of confounding variables, results suggest that food insecurity generally was not associated with developmental change in children's behaviour problems. The impact of food insecurity on behaviour problems may be episodic or interact with certain developmental stages. PMID:27559210

Managerial modes of influence and counterproductivity in organizations: a longitudinal business-unit-level investigation.

PubMed

Detert, James R; Treviño, Linda K; Burris, Ethan R; Andiappan, Meena

2007-07-01

The authors studied the effect of 3 modes of managerial influence (managerial oversight, ethical leadership, and abusive supervision) on counterproductivity, which was conceptualized as a unit-level outcome that reflects the existence of a variety of intentional and unintentional harmful employee behaviors in the unit. Counterproductivity was represented by an objective measure of food loss in a longitudinal study of 265 restaurants. After prior food loss and alternative explanations (e.g., turnover, training, neighborhood income) were controlled for, results indicated that managerial oversight and abusive supervision significantly influenced counterproductivity in the following periods, whereas ethical leadership did not. Counterproductivity was also found to be negatively related to both restaurant profitability and customer satisfaction in the same period and to mediate indirect relationships between managerial influences and distal unit outcomes.

The CogBIAS longitudinal study protocol: cognitive and genetic factors influencing psychological functioning in adolescence.

PubMed

Booth, Charlotte; Songco, Annabel; Parsons, Sam; Heathcote, Lauren; Vincent, John; Keers, Robert; Fox, Elaine

2017-12-29

Optimal psychological development is dependent upon a complex interplay between individual and situational factors. Investigating the development of these factors in adolescence will help to improve understanding of emotional vulnerability and resilience. The CogBIAS longitudinal study (CogBIAS-L-S) aims to combine cognitive and genetic approaches to investigate risk and protective factors associated with the development of mood and impulsivity-related outcomes in an adolescent sample. CogBIAS-L-S is a three-wave longitudinal study of typically developing adolescents conducted over 4 years, with data collection at age 12, 14 and 16. At each wave participants will undergo multiple assessments including a range of selective cognitive processing tasks (e.g. attention bias, interpretation bias, memory bias) and psychological self-report measures (e.g. anxiety, depression, resilience). Saliva samples will also be collected at the baseline assessment for genetic analyses. Multilevel statistical analyses will be performed to investigate the developmental trajectory of cognitive biases on psychological functioning, as well as the influence of genetic moderation on these relationships. CogBIAS-L-S represents the first longitudinal study to assess multiple cognitive biases across adolescent development and the largest study of its kind to collect genetic data. It therefore provides a unique opportunity to understand how genes and the environment influence the development and maintenance of cognitive biases and provide insight into risk and protective factors that may be key targets for intervention.

Lesion registration for longitudinal disease tracking in an imaging informatics-based multiple sclerosis eFolder

NASA Astrophysics Data System (ADS)

Ma, Kevin; Liu, Joseph; Zhang, Xuejun; Lerner, Alex; Shiroishi, Mark; Amezcua, Lilyana; Liu, Brent

2016-03-01

We have designed and developed a multiple sclerosis eFolder system for patient data storage, image viewing, and automatic lesion quantification results stored in DICOM-SR format. The web-based system aims to be integrated in DICOM-compliant clinical and research environments to aid clinicians in patient treatments and data analysis. The system needs to quantify lesion volumes, identify and register lesion locations to track shifts in volume and quantity of lesions in a longitudinal study. In order to perform lesion registration, we have developed a brain warping and normalizing methodology using Statistical Parametric Mapping (SPM) MATLAB toolkit for brain MRI. Patients' brain MR images are processed via SPM's normalization processes, and the brain images are analyzed and warped according to the tissue probability map. Lesion identification and contouring are completed by neuroradiologists, and lesion volume quantification is completed by the eFolder's CAD program. Lesion comparison results in longitudinal studies show key growth and active regions. The results display successful lesion registration and tracking over a longitudinal study. Lesion change results are graphically represented in the web-based user interface, and users are able to correlate patient progress and changes in the MRI images. The completed lesion and disease tracking tool would enable the eFolder to provide complete patient profiles, improve the efficiency of patient care, and perform comprehensive data analysis through an integrated imaging informatics system.

Patterns of Physical Activity and Overweight among 7-13-Year-Old Russian Children: A 7-Year Nationally Representative Monitoring Study

ERIC Educational Resources Information Center

Tudor-Locke, Catrine; Ainsworth, Barbara E.; Popkin, B. M.

2008-01-01

This is a repeated cross-sectional study of overweight and physical activity (PA) and inactivity patterns of successive samples of 7-13-year-old Russian children who were surveyed six times between 1995 and 2002 as part of the Russian Longitudinal Monitoring Survey. This analysis focused on moderate/vigorous (MOD/VIG) PA (e.g., active commuting to…

A Prospective Cohort Study of Periodontal Disease Measures and Cardiovascular Disease Markers in HIV-Infected Adults

PubMed Central

Babineau, Denise C.; Demko, Catherine A.; Lederman, Michael M.; Wang, Xuelei; Toossi, Zahra; Weinberg, Aaron; Rodriguez, Benigno

2011-01-01

Abstract The determinants of HIV-associated cardiovascular disease (CVD) are not well understood. Periodontal disease (PD) has been linked to CVD but this connection has not been examined in HIV infection. We followed a cohort of HIV-infected adults to ascertain whether PD was associated with carotid artery intima media thickness (IMT) and brachial artery flow-mediated dilation (FMD). We performed a longitudinal observational study of HIV-infected adults on HAART for <2 years with no known heart disease. PD was characterized clinically and microbiologically. Cardiovascular disease was assessed by IMT/FMD. Linear mixed models assessed cross-sectional and longitudinal associations between PD and FMD/IMT. Forty three HIV+ adults completed a median of 24 (6–44) months on the study. Defining delta to be the change in a variable between baseline and a follow-up time, longitudinally, on average and after adjusting for change in time, CVD-specific and HIV-specific potential confounding covariates, a 1-log10 increase in delta Porphyromonas gingivalis was associated with a 0.013 mm increase in delta IMT (95% CI: 0.0006–0.0262; p=0.04). After adjusting for the same potential confounding covariates, a 10% increase in delta gingival recession was associated with a 2.3% increase in delta FMD (95% CI: 0.4–4.2; p=0.03). In a cohort of HIV-infected adults, an increase in subgingival Porphyromonas gingivalis, a known periodontal pathogen, was significantly associated with longitudinal increases in IMT, while increased gingival recession, which herein may represent PD resolution, was significantly associated with longitudinal improvement in FMD. In the context of HIV infection, PD may contribute to CVD risk. Intervention studies treating PD may help clarify this association. PMID:21443451

Co-occurrences between adolescent substance use and academic performance: school context influences a multilevel-longitudinal perspective.

PubMed

Andrade, Fernando H

2014-08-01

A growing body of literature has linked substance use and academic performance exploring substance use as a predictor of academic performance or vice versa. This study uses a different approach conceptualizing substance use and academic performance as parallel outcomes and exploring two topics: its multilevel-longitudinal association and school contextual effects on both outcomes. Using multilevel Confirmatory Factor Analysis and multilevel-longitudinal analyses, the empirical estimates relied on 7843 students nested in 114 schools (Add Health study). The main finding suggests that the correlation between substance use and academic performance was positive at the school level in contraposition to the negative relationship at the individual level. Additional findings suggest a positive effect of a school risk factor on substance use and a positive effect of academic pressure on academic performance. These findings represent a contribution to our understanding of how schools could affect the relationship between academic performance and substance use. Copyright © 2014 The Foundation for Professionals in Services for Adolescents. Published by Elsevier Ltd. All rights reserved.

Predicting Children's Media Use in the USA: Differences in Cross-Sectional and Longitudinal Analysis

ERIC Educational Resources Information Center

Lee, Sook-Jung; Bartolic, Silvia; Vandewater, Elizabeth A.

2009-01-01

The purpose of this paper is to examine the predictors of children's media use in the USA, comparing cross-sectional and longitudinal analyses. Data come from Waves 1 and 2 of the Child Development Supplement (CDS-I; CDS-II), a nationally representative sample of American children aged 0-12 in 1997 and 5-18 in 2002. Twenty-four hour time use…

The Demographics of Alcohol Use among Young Americans: Results from the 1983 National Longitudinal Survey of Labor Market Experience of Youth.

ERIC Educational Resources Information Center

Crowley, Joan E.

This document gives results of research on alcohol use by young Americans from the 1983 National Longitudinal Survey of Labor Market Experience of Youth, a survey of a large, nationally representative sample supplemented by samples of blacks, Hispanics, and economically disadvantaged non-black, non-Hispanic youth and covering the entire range of…

Weighing in on the Issue: A Longitudinal Analysis of the Influence of Selected Individual Factors and the Sports Context on the Developmental Trajectories of Eating Pathology among Adolescents

ERIC Educational Resources Information Center

Fay, Kristen; Lerner, Richard M.

2013-01-01

Eating disorders, and related issues (e.g., body dissatisfaction, weight control behaviors), represent pressing and prevalent health problems that affect American adolescents with alarming frequency and potentially chronic consequences. However, more longitudinal research is needed to elucidate the developmental processes that increase or maintain…

Continuity and change in the social stratification of aging and health over the life course: evidence from a nationally representative longitudinal study from 1986 to 2001/2002 (Americans' Changing Lives Study).

PubMed

House, James S; Lantz, Paula M; Herd, Pamela

2005-10-01

This article overviews previously published and ongoing research from the Americans' Changing Lives (ACL) Study, a longitudinal study of a nationally representative sample of 3,617 adults aged 25 years and older when first interviewed in 1986, focusing on socioeconomic disparities in the way health changes with age during middle and later life, especially in terms of compression of morbidity/functional limitations. A variety of descriptive and multivariate regression and growth curve analyses are done on the ACL sample, now surveyed over four waves spanning 15.5 years between 1986 and 2001/2002 with continuing mortality ascertainment via the National Death Index, death certificate searches, and informant reports. Both cross-sectional and longitudinal analyses indicate that socioeconomic disparities in health are small in early adulthood, increase through middle and early old age, and then lessen again in later old age. In other terms, compression of morbidity/functional limitations into the later stages of the life course is realized to a much greater degree among the better educated compared with the less educated. Cross-sectional evidence suggests that this reflects differential exposure to or experience of a wide range of psychosocial, environmental, and biomedical risk factors for health (and perhaps their differential impact at different ages and life stages), as well as variations in biological robustness and frailty and also perhaps in the strength of social welfare supports for health at different life stages. Longitudinal analyses reveal several new insights: (a) The flow of causality is much greater from socioeconomic position to health than vice versa; (b) education plays a greater role relative to income in the onset of functional limitations, whereas income has much stronger effects on their progression or course; and (c) educational disparities in the onset and hence of compression of functional limitations over the life course have increased strikingly in later middle and early old age (ages 55-84 years) since 1986. The results indicate that understanding and alleviating social disparities in health are both theoretically and methodologically quintessential problems of life course analysis and research.

Policy, Service Pathways and Mortality: A 10-Year Longitudinal Study of People with Profound Intellectual and Multiple Disabilities

ERIC Educational Resources Information Center

Hogg, James; Juhlberg, K.; Lambe, L.

2007-01-01

Background: One hundred and forty-two children and adults with profound intellectual and multiple disabilities were identified in 1993 in a single Scottish region on whom detailed information was collected via a postal questionnaire survey. Methods: They were followed up in 2003. The time spanned represented a period of significant policy change…

The Relationships between Emerging Adults' Expressed Desire to Marry and Frequency of Participation in Risk-Taking Behaviors

ERIC Educational Resources Information Center

Willoughby, Brian J.; Dworkin, Jodi

2009-01-01

The impact that desire to marry has on risk-taking behaviors during emerging adulthood is examined in the current investigation using nationally representative data from the National Longitudinal Study of Adolescent Health (Add Health). Looking both at the simple relationships between desire to marry and risk-taking behaviors, as well as the…

Introducing a longitudinal study of community gardeners and gardens in New York City

Treesearch

Erika S. Svendsen; Lindsay K. Campbell; Nancy Falxa-Raymond; Jessica Northridge; Edie Stone

2012-01-01

For almost a decade, the NYC Department of Parks and Recreation GreenThumb program has collected data about hundreds of New York City community gardens citywide to understand how these gardens function. Building on a data set that includes surveys and interviews conducted periodically with garden representatives since 2003, GreenThumb and USDA Forest Service...

Persistence and Attainment of 2011-12 First-Time Postsecondary Students after 3 Years. First Look. NCES 2016-401

ERIC Educational Resources Information Center

Ifill, Nicole; Radford, Alexandria Walton; Wu, Joanna; Cataldi, Emily Forrest; Wilson, David; Hill, Jason

2016-01-01

This report provides a "first look" at selected findings from the 2012/14 Beginning Postsecondary Students Longitudinal Study (BPS:12/14). It is based on final data describing a nationally representative sample of undergraduates who entered postsecondary education for the first time during the 2011-12 academic year. BPS:12/14 covers the…

Tracking Emotional and Behavioral Changes in Childhood: Does the Strength and Difficulties Questionnaire Measure the Same Constructs across Time?

ERIC Educational Resources Information Center

Sosu, Edward M.; Schmidt, Peter

2017-01-01

R. Goodman's Strength and Difficulties Questionnaire (SDQ) is widely used to measure emotional and behavioral difficulties in childhood and adolescence. In the present study, we examined whether the SDQ measures the same construct across time, when used for longitudinal research. A nationally representative sample of parents (N = 3,375) provided…

Psychosocial Factors in Adolescent and Young Adult Self-Reported Depressive Symptoms: Causal or Correlational Associations?

ERIC Educational Resources Information Center

Steinhausen, Hans-Christoph; Haslimeier, Claudia; Metzke, Christa Winkler

2007-01-01

Using a large longitudinal representative community sample, this study identified three groups of subjects who were depressed either in pre-adolescence, late adolescence or early adulthood, and matched by age and gender to controls without depression. The 90th percentile on one or two self-reported symptom scales [i. e. the Center for…

Impacts of Good Practices on Cognitive Development, Learning Orientations, and Graduate Degree Plans during the First Year of College

ERIC Educational Resources Information Center

Cruce, Ty M.; Wolniak, Gregory C.; Seifert, Tricia A.; Pascarella, Ernest T.

2006-01-01

This study estimated separately the unique effects of three dimensions of good practice and the global effects of a composite measure of good practices on the cognitive development, orientations to learning, and educational aspirations of students during their first year of college. Analyses of longitudinal data from a representative sample of…

The Over-Scheduling Hypothesis Revisited: Intensity of Organized Activity Participation during Adolescence and Young Adult Outcomes

ERIC Educational Resources Information Center

Mahoney, Joseph L.; Vest, Andrea E.

2012-01-01

Concern exists that youth who spend a lot of time participating in organized out-of-school activities (e.g., sports) are at-risk for poor developmental outcomes. This concern--called the over-scheduling hypothesis--has primarily been assessed in terms of adolescent adjustment. This longitudinal study of a nationally representative sample of 1,115…

The Incidence of Potentially Gifted Students within a Special Education Population

ERIC Educational Resources Information Center

Barnard-Brak, Lucy; Johnsen, Susan K.; Hannig, Alyssa Pond; Wei, Tianlan

2015-01-01

From a sample of 13,176 children with disabilities who were a part of the Special Education Elementary Longitudinal Study, 330 students achieved a score at the 90th percentile or higher on the Woodcock-Johnson III. These children represent some 9.1% of children who have disabilities nationally and who might be identified as gifted or academically…

Early Delayed Language Development in Very Preterm Infants: Evidence from the MacArthur-Bates CDI

ERIC Educational Resources Information Center

Foster-Cohen, Susan; Edgin, Jamie O.; Champion, Patricia R.; Woodward, Lianne J.

2007-01-01

This study examined the effects of being born very preterm on children's early language development using prospective longitudinal data from a representative regional cohort of 90 children born very preterm (gestational age less than 33 weeks and/or birth weight less than 1,500 grams) and a comparison sample of 102 children born full term…

Summary of low-speed longitudinal aerodynamics of two powered close-coupled wing-canard fighter configurations. [conducted in Langley C/STOL tunnel

NASA Technical Reports Server (NTRS)

Paulson, J. W., Jr.; Thomas, J. L.

1979-01-01

Investigations of the low speed longitudinal characteristics of two powered close coupled wing-canard fighter configurations are discussed. Data obtained at angles of attack from -2 deg to 42 deg, Mach numbers from 0.12 to 0.20, nozzle and flap deflections from 0 deg to 40 deg, and thrust coefficients from 0 to 2.0, to represent both high angle of attack subsonic maneuvering characteristics and conventional takeoff and landing characteristics are examined. Data obtained with the nozzles deflected either 60 deg or 90 deg and the flaps deflected 60 deg to represent vertical or short takeoff and landing characteristics are discussed.

Prognostic Significance of Spot Urine Na/K for Longitudinal Changes in Blood Pressure and Renal Function: The Nagahama Study.

PubMed

Tabara, Yasuharu; Takahashi, Yoshimitsu; Setoh, Kazuya; Kawaguchi, Takahisa; Kosugi, Shinji; Nakayama, Takeo; Matsuda, Fumihiko

2017-09-01

Urinary sodium-to-potassium ratio (Na/K) represents a simple measure of sodium load and has been reported to be associated with blood pressure (BP) levels in a cross-sectional setting even with spot measurements. The aim of the present large-scale cohort study is to determine prognostic significance of spot urine Na/K for longitudinal changes in BP levels and renal function. The present study population consisted of 7,063 individuals from the general population. Clinical parameters were measured at baseline and at a follow-up interval of 5 years. Mean systolic BP was slightly increased during the follow-up period (overall, 124 ± 17 to 125 ± 18 mm Hg; nontreated participants, 119 ± 15 to 122 ± 17 mm Hg). Although, the urinary Na/K demonstrated a linear association with BP in a cross-sectional analysis (P < 0.001), analysis of repeated measured BP values identified baseline Na/K * time interaction, i.e., an intraindividual effect, as an inverse determinant (F = 76.9, P < 0.001) independently of hypertension status and fasting conditions possibly due to regression to the mean of temporary high baseline Na/K values at baseline. Spot urine Na/K values were found to be positively associated with renal function in a cross-sectional analysis (P < 0.001). Although baseline Na/K * time interaction showed inverse associated with renal functional decline (F = 85.8, P < 0.001), this inverse association might not represent physiological relationship in likewise fashion with the analysis for BP. Spot urine Na/K may have limited utility as a prognostic marker of longitudinal BP change, as well as renal functional decline. © American Journal of Hypertension, Ltd 2017. All rights reserved. For Permissions, please email: journals.permissions@oup.com

Detecting glaucomatous change in visual fields: Analysis with an optimization framework.

PubMed

Yousefi, Siamak; Goldbaum, Michael H; Varnousfaderani, Ehsan S; Belghith, Akram; Jung, Tzyy-Ping; Medeiros, Felipe A; Zangwill, Linda M; Weinreb, Robert N; Liebmann, Jeffrey M; Girkin, Christopher A; Bowd, Christopher

2015-12-01

Detecting glaucomatous progression is an important aspect of glaucoma management. The assessment of longitudinal series of visual fields, measured using Standard Automated Perimetry (SAP), is considered the reference standard for this effort. We seek efficient techniques for determining progression from longitudinal visual fields by formulating the problem as an optimization framework, learned from a population of glaucoma data. The longitudinal data from each patient's eye were used in a convex optimization framework to find a vector that is representative of the progression direction of the sample population, as a whole. Post-hoc analysis of longitudinal visual fields across the derived vector led to optimal progression (change) detection. The proposed method was compared to recently described progression detection methods and to linear regression of instrument-defined global indices, and showed slightly higher sensitivities at the highest specificities than other methods (a clinically desirable result). The proposed approach is simpler, faster, and more efficient for detecting glaucomatous changes, compared to our previously proposed machine learning-based methods, although it provides somewhat less information. This approach has potential application in glaucoma clinics for patient monitoring and in research centers for classification of study participants. Copyright © 2015 Elsevier Inc. All rights reserved.

Stiffness and Poisson ratio in longitudinal compression of fiber yarns in meso-FE modelling of composite reinforcement forming

NASA Astrophysics Data System (ADS)

Wang, D.; Naouar, N.; Vidal-Salle, E.; Boisse, P.

2018-05-01

In meso-scale finite element modeling, the yarns of the reinforcement are considered to be solids made of a continuous material in contact with their neighbors. The present paper consider the mechanical behavior of these yarns that can happen for some loadings of the reinforcement. The yarns present a specific mechanical behavior when under longitudinal compression because they are made up of a large number of fibers, Local buckling of the fibers causes the compressive stiffness of the continuous material representing the yarn to be much weaker than when under tension. In addition, longitudinal compression causes an important transverse expansion. It is shown that the transverse expansion can be depicted by a Poisson ratio that remained roughly constant when the yarn length and the compression strain varied. Buckling of the fibers significantly increases the transverse dimensions of the yarn which leads to a large Poisson ratio (up to 12 for a yarn analyzed in the present study). Meso-scale finite element simulations of reinforcements with binder yarns submitted to longitudinal compression showed that these improvements led to results in good agreement with micro-CT analyses.

Are people who claim compensation "cured by a verdict"? A longitudinal study of health outcomes after whiplash.

PubMed

Spearing, Natalie M; Gyrd-Hansen, Dorte; Pobereskin, Louis H; Rowell, David S; Connelly, Luke B

2012-09-01

This study examines whether the lure of injury compensation prompts whiplash claimants to overstate their symptoms. Claim settlement is the intervention of interest, as it represents the point at which there is no further incentive to exaggerate symptoms, and neck pain at 24 months is the outcome of interest. Longitudinal data on neck pain scores and timing of claim settlement were regressed, controlling for the effect of time on recovery, to compare outcomes in claimants who had and had not settled their compensation claims. The results show clearly that removing the financial incentive to over-report symptoms has no effect on self-reported neck pain in a fault-based compensation scheme, and this finding concurs with other studies on this topic. Policy decisions to limit compensation in the belief that claimants systematically misrepresent their health status are not supported empirically Claimants do not appear to be "cured by a verdict".

Early mathematical competencies and later achievement: insights from the Longitudinal Study of Australian Children

NASA Astrophysics Data System (ADS)

MacDonald, Amy; Carmichael, Colin

2017-11-01

International research suggests that early mathematical competence predicts later mathematical achievement. In this article, we explore the relationship between mathematical competencies at 4-5 years, as measured by teacher ratings, and later results on Years 3, 5, 7 and 9 National Assessment Program - Literacy and Numeracy (NAPLAN) numeracy tests. Data from a nationally representative sample of 2343 children participating in the Longitudinal Study of Australian Children (LSAC) are examined. In line with international studies, we report moderate correlations between preschool-entry mathematics and later NAPLAN numeracy test results. However, analysis of individual growth trajectories indicates that early mathematics predicts the initial (Year 3) level, but not subsequent growth. This suggests that early mathematical competencies are important for enhancing achievement in early schooling, but that the quality of mathematics education provided in the schooling years is critical for future development.

Day-to-day affect is surprisingly stable: A two-year longitudinal study of well-being

PubMed Central

Hudson, Nathan W.; Lucas, Richard E.; Donnellan, M. Brent

2017-01-01

Previous research suggests global assessments of cognitive well-being—life satisfaction—are relatively stable over time. Far fewer studies have examined the extent to which experiential measures of affective well-being—the moods/emotions people regularly experience—are stable, especially over extended periods of time. The present study used longitudinal data from a representative sample of Germans to investigate the long-term stability of different components of well-being. Participants provided global ratings of life satisfaction and affect, along with experiential measures of well-being up to three times over two years. Results indicated between one third and one half of the variance in people’s daily affect was attributable to trait-like latent variables. Replicating meta-analytic findings, 50% of the variance in global measures of well-being was attributable to trait-like latent variables. PMID:29238453

Changes in the Characteristics, Services, and Performance of Preschoolers with Disabilities from 2003-04 to 2004-05. Wave 2 Overview Report from the Pre-Elementary Education Longitudinal Study (PEELS). NCSER 2008-3011

ERIC Educational Resources Information Center

Carlson, Elaine; Daley, Tamara; Shimshak, Amy; Riley, Jarnee; Keller, Brad; Jenkins, Frank; Markowitz, Joy; Rosenquist, Celia

2008-01-01

PEELS involves a nationally representative sample of children, 3 to 5 years of age when they entered the study, with diverse disabilities who are receiving preschool special education services in a variety of settings. Topics covered in the report include declassification (children leaving special education), reclassification (movement from one…

Longitudinal Trajectory of the Relationship Between Self-Esteem and Substance Use From Adolescence to Young Adulthood.

PubMed

Lee, Chung Gun; Seo, Dong-Chul; Torabi, Mohammad R; Lohrmann, David K; Song, Tae Min

2018-01-01

We examined the longitudinal trajectory of substance use (binge drinking, marijuana use, and cocaine use) in relation to self-esteem from adolescence to young adulthood. Generalized estimating equation models were fit using SAS to investigate changes in the relation between self-esteem and each substance use (binge drinking, marijuana use, and cocaine use) from adolescence to young adulthood. Data were drawn from the 3 waves of the National Longitudinal Study of Adolescent Health, a nationally representative sample of middle and high school students in the United States (N = 6504). Self-esteem was a significant predictor for the use of all 3 substances at 15 years of age (ps < .001). However, at age 21, self-esteem no longer predicted binge drinking and marijuana use in the controlled model. It appears that self-esteem loses its protective role against substance use except cocaine use as adolescents transition to young adulthood. © 2018, American School Health Association.

The Relationship Context for Sexual Activity and its Associations with Romantic Cognitions among Emerging Adults

PubMed Central

Collibee, Charlene

2015-01-01

Few studies have examined the associations of sexual activity with romantic cognitions, particularly longitudinally. We used a multi-analytic approach to examine the longitudinal, between-person, and within-person associations between sexual activity and romantic cognitions. We distinguished among sexual activity with four different types of partners—romantic partners, friends, acquaintances, and friends with benefits. An ethnically/racially representative sample of 185 participants (94 males & 91 females) completed questionnaires when they were 2.5, 4, and 5.5 years out of high school. Frequent sexual activity with a romantic partner was associated with positive romantic cognitions, including less avoidant and anxious relational styles, greater romantic life satisfaction, and romantic appeal. Frequent sexual activity with various nonromantic partners was often associated with more negative romantic cognitions, including avoidant styles, lower romantic life satisfaction, and lower romantic appeal. Few longitudinal effects were found. Findings contribute to a developmental task theory concepualization of sexual behavior. PMID:27242952

Developmental Origins of Low Mathematics Performance and Normal Variation in Twins from 7 to 9 Years

PubMed Central

Haworth, Claire M. A.; Kovas, Yulia; Petrill, Stephen A.; Plomin, Robert

2009-01-01

A previous publication reported the etiology of mathematics performance in 7-year-old twins (Oliver et al., 2004). As part of the same longitudinal study we investigated low mathematics performance and normal variation in a representative United Kingdom sample of 1713 same-sex 9-year-old twins based on teacher-assessed National Curriculum standards. Univariate individual differences and DeFries-Fulker extremes analyses were performed. Similar to our results at 7 years, all mathematics scores at 9 years showed high heritability (.62–.75) and low shared environmental estimates (.00–.11) for both the low performance group and the full sample. Longitudinal analyses were performed from 7 to 9 years. These longitudinal analyses indicated strong genetic continuity from 7 to 9 years for both low performance and mathematics in the normal range. We conclude that, despite the considerable differences in mathematics curricula from 7 to 9 years, the same genetic effects largely operate at the two ages. PMID:17539370

Developmental origins of low mathematics performance and normal variation in twins from 7 to 9 years.

PubMed

Haworth, Claire M A; Kovas, Yulia; Petrill, Stephen A; Plomin, Robert

2007-02-01

A previous publication reported the etiology of mathematics performance in 7-year-old twins (Oliver et al., 2004). As part of the same longitudinal study we investigated low mathematics performance and normal variation in a representative United Kingdom sample of 1713 same-sex 9-year-old twins based on teacher-assessed National Curriculum standards. Univariate individual differences and DeFries-Fulker extremes analyses were performed. Similar to our results at 7 years, all mathematics scores at 9 years showed high heritability (.62-.75) and low shared environmental estimates (.00-.11) for both the low performance group and the full sample. Longitudinal analyses were performed from 7 to 9 years. These longitudinal analyses indicated strong genetic continuity from 7 to 9 years for both low performance and mathematics in the normal range. We conclude that, despite the considerable differences in mathematics curricula from 7 to 9 years, the same genetic effects largely operate at the two ages.

Are Video Games a Gateway to Gambling? A Longitudinal Study Based on a Representative Norwegian Sample.

PubMed

Molde, Helge; Holmøy, Bjørn; Merkesdal, Aleksander Garvik; Torsheim, Torbjørn; Mentzoni, Rune Aune; Hanns, Daniel; Sagoe, Dominic; Pallesen, Ståle

2018-06-05

The scope and variety of video games and monetary gambling opportunities are expanding rapidly. In many ways, these forms of entertainment are converging on digital and online video games and gambling sites. However, little is known about the relationship between video gaming and gambling. The present study explored the possibility of a directional relationship between measures of problem gaming and problem gambling, while also controlling for the influence of sex and age. In contrast to most previous investigations which are based on cross-sectional designs and non-representative samples, the present study utilized a longitudinal design conducted over 2 years (2013, 2015) and comprising 4601 participants (males 47.2%, age range 16-74) drawn from a random sample from the general population. Video gaming and gambling were assessed using the Gaming Addiction Scale for Adolescents and the Canadian Problem Gambling Index, respectively. Using an autoregressive cross-lagged structural equation model, we found a positive relationship between scores on problematic gaming and later scores on problematic gambling, whereas we found no evidence of the reverse relationship. Hence, video gaming problems appear to be a gateway behavior to problematic gambling behavior. In future research, one should continue to monitor the possible reciprocal behavioral influences between gambling and video gaming.

Longitudinal Associations in Youth Involvement as Victimized, Bullying, or Witnessing Cyberbullying.

PubMed

Holfeld, Brett; Mishna, Faye

2018-04-01

Although cyberbullying has been linked to cyber victimization, it is unknown whether witnessing cyberbullying impacts and is impacted by experiences of cyberbullying and victimization. In the current study, we examine the frequency of youth involved as victimized, bullying, and witnessing cyberbullying and how these experiences are associated across three academic years. Participants comprised 670 Canadian students who began the longitudinal study in grades 4, 7, or 10 at Time 1 (T1). Cyber witnessing represented the largest role of youth involvement in cyberbullying. Cyber witnessing was positively associated with both cyberbullying and victimization. Cyber victimization at T1 was positively associated with cyber witnessing at T2, which was positively related to both cyberbullying and victimization at T3. Findings highlight the significance of addressing the role of cyber witnesses in cyberbullying prevention and intervention efforts.

Surveying the Nation: Longitudinal Surveys and the Construction of National Solutions to Educational Inequity

ERIC Educational Resources Information Center

Hutt, Ethan L.

2016-01-01

This paper examines the origins and influences of the introduction of longitudinal student data-sets as a way of gaining insight into the operation of American schools and as a tool for policy-makers. The paper argues that the creation of this new form of data in the 1960s and 1970s represented a relatively new way of thinking about American…

Spectropolarimetry of magnetic stars. IV. The crossover effect.

NASA Astrophysics Data System (ADS)

Mathys, G.

1995-01-01

This paper is devoted to the study of the crossover effect in magnetic Ap stars. It is shown that this effect can be measured by the second order moment about their centre of the profiles of spectral lines recorded in the Stokes parameter V. The interpretation of these measurements in terms of magnetic field is developed. It is shown that one can derive from them a quantity called the mean asymmetry of the longitudinal magnetic field, which is the first moment of the component of the magnetic field along the line of sight, about the plane defined by the line of sight and the stellar rotation axis. The consistency of the determination of this quantity with that of the mean longitudinal magnetic field from measurements of wavelength shifts of lines between right and left circular polarization is demonstrated. This technique of analysis is applied to observations of a sample of 29 stars, among which 10 have a detectable crossover effect. For 8 of them, the available observational data allow the study of the variations of the asymmetry of the longitudinal field with rotation phase. In most cases, this variation is sinusoidal and essentially symmetric about 0, and it occurs in quadrature with the variation of the mean longitudinal field. A more complex behaviour is definitely observed in HD 147010 and HD 175362, where the variation of the asymmetry of the longitudinal field is better represented by the superposition of two sinusoids, one with the rotation frequency of the star, and the other with twice that frequency.

Base-Year to Fourth Follow-up Data File User's Manual. National Education Longitudinal Study of 1988. NCES 2002-323

ERIC Educational Resources Information Center

Curtin, Thomas R.; Ingels, Steven; Wu, Shiying; Heuer, Ruth

2002-01-01

A nationally representative sample of eighth-graders were first surveyed in the spring of 1988. A sample of these respondents were then resurveyed through four follow-ups in 1990, 1992, 1994, and 2000. On the questionnaire, students reported on a range of topics including: school, work, and home experiences; educational resources and support; the…

Whatever Happened to the Class of 1994? A Three-Year Longitudinal Study of Traditional Freshmen Entering Frederick Community College in the Fall 1994 Semester.

ERIC Educational Resources Information Center

Holton, James M.

Traditional freshmen, or first-time students who enter college immediately after graduating high school, represent the largest identifiable group of students within Frederick Community College's (FCC) student body. They are afforded a considerable amount of resources from college staff, and for them the college follows various measurements of…

Do Moral Choices Make Us Feel Good? The Development of Adolescents' Emotions Following Moral Decision Making

ERIC Educational Resources Information Center

Malti, Tina; Keller, Monika; Buchmann, Marlis

2013-01-01

Some people believe that making the morally right decision makes people feel good. However, until now, there has been no empirical evidence in support of this belief. In a representative two-wave longitudinal study of 995 15-year-old adolescents followed for 3 years (until the age of 18) in Switzerland, adolescents were asked about their decisions…

Expectancy-Value Models for the STEM Persistence Plans of Ninth-Grade, High-Ability Students: A Comparison between Black, Hispanic, and White Students

ERIC Educational Resources Information Center

Andersen, Lori; Ward, Thomas J.

2014-01-01

Group differences in the effects of the expectancies and values that high-ability students have for science and mathematics on plans to persist in science, technology, engineering, and mathematics (STEM) were investigated. A nationally representative sample of ninth-grade students, the High School Longitudinal Study of 2009 (HSLS: 2009; n =…

An Investigation of the Six-Year Persistence/Attainment of Independent Students and Students Beginning in Community Colleges, 2003-04--2008-09: A Closer Look at Academic and Social Integration Factors

ERIC Educational Resources Information Center

Ruot, Brenda

2013-01-01

The persistence of college students, particularly through credential attainment, is of importance to many stakeholders in higher education, including policymakers, taxpayers, parents and students. This dissertation study used longitudinal data nationally representative of higher education institutions and students, the National Center for…

Strong Families, Tidy Houses, and Children's Values in Adult Life: Are "Chaotic", "Crowded" and "Unstable" Homes Really so Bad?

ERIC Educational Resources Information Center

Flouri, Eirini

2009-01-01

Chaotic home systems have been linked with children's adverse psychological and academic outcomes. But, as they represent a departure from the suburban ideal of space, order, and family cohesiveness and stability, they should also be linked with low support for survival values. Using longitudinal data from the 1970 British Cohort Study (BCS70)…

Longitudinal Associations of Neighborhood Collective Efficacy and Maternal Corporal Punishment with Behavior Problems in Early Childhood

PubMed Central

Ma, Julie; Grogan-Kaylor, Andrew

2017-01-01

Neighborhood and parenting influences on early behavioral outcomes are strongly dependent upon a child's stage of development. However, little research has jointly considered the longitudinal associations of neighborhood and parenting processes with behavior problems in early childhood. To address this limitation, this study explores the associations of neighborhood collective efficacy and maternal corporal punishment with the longitudinal patterns of early externalizing and internalizing behavior problems. The study sample consisted of 3,705 families from a nationally representative cohort study of urban families. Longitudinal multilevel models examined the associations of collective efficacy and corporal punishment with behavior problems at age 3, as well as with patterns of behavior problems between the ages 3 to 5. Interactions between the main predictors and child age tested whether neighborhood and parent relationships with child behavior varied over time. Mediation analysis examined whether neighborhood influences on child behavior were mediated by parenting. The models controlled for a comprehensive set of possible confounders at the child, parent, and neighborhood levels. Results indicate that both maternal corporal punishment and low neighborhood collective efficacy were significantly associated with increased behavior problems. The significant interaction between collective efficacy and child age with internalizing problems suggests that neighborhood influences on internalizing behavior were stronger for younger children. The indirect effect of low collective efficacy on behavior problems through corporal punishment was not significant. These findings highlight the importance of multilevel interventions that promote both neighborhood collective efficacy and non-physical discipline in early childhood. PMID:28425727

Psychosocial factors and financial literacy.

PubMed

Murphy, John L

2013-01-01

This study uses data from the Health and Retirement Study (HRS) to analyze the psychological and social variables associated with financial literacy. The HRS is a nationally representative longitudinal survey of individuals older than age 50 and their spouses. An ordinary least squares linear regression analysis explores the relationship between financial literacy and several economic and psychosocial variables. After controlling for earnings, level of education, and other socioeconomic variables in this exploratory study, I find that financial satisfaction and religiosity are correlated with financial literacy.

Homebound older persons: Prevalence, characteristics, and longitudinal predictors

PubMed Central

Cohen-Mansfield, Jiska; Shmotkin, Dov; Hazan, Haim

2011-01-01

The current study examines the prevalence and correlates of homebound status aiming to elucidate the predictors and implications of being homebound. Analyzed sample was drawn from two representative cohorts of older persons in Israel, including 1191 participants (mean age = 83.10 ± 5.3 years) of the first wave of the Cross-Sectional and Longitudinal Aging Study (CALAS) and 418 participants (mean age = 83.13 ± 5.2) of the Israeli Multidisciplinary Aging Study (IMAS). Cross-sectional and longitudinal analyses were conducted. Homebound prevalence rates of 17.7% -19.5% were found. Homebound participants tended to be older, female, have obese or underweight body mass index (BMI), poorer health, lower functional status, less income, higher depressed affect, were significantly lonelier (in CALAS), and more likely to have stairs and no elevators, than their counterparts. Predictors of becoming homebound include low functional IADL status, having stairs and no elevator (in both cohorts), old age, female gender, and being obese or underweight (in CALAS). The study shows homebound status is a prevalent problem in old-old Israelis. Economic and socio-demographic resources, environment, and function play a role in determining the older person's homebound status. Implications for preventing homebound status and mitigating its impact with regards to the Israeli context are discussed. PMID:21420181

Is low cognitive functioning a predictor or consequence of major depressive disorder? A test in two longitudinal birth cohorts.

PubMed

Schaefer, Jonathan D; Scult, Matthew A; Caspi, Avshalom; Arseneault, Louise; Belsky, Daniel W; Hariri, Ahmad R; Harrington, Honalee; Houts, Renate; Ramrakha, Sandhya; Poulton, Richie; Moffitt, Terrie E

2017-11-16

Cognitive impairment has been identified as an important aspect of major depressive disorder (MDD). We tested two theories regarding the association between MDD and cognitive functioning using data from longitudinal cohort studies. One theory, the cognitive reserve hypothesis, suggests that higher cognitive ability in childhood decreases risk of later MDD. The second, the scarring hypothesis, instead suggests that MDD leads to persistent cognitive deficits following disorder onset. We tested both theories in the Dunedin Study, a population-representative cohort followed from birth to midlife and assessed repeatedly for both cognitive functioning and psychopathology. We also used data from the Environmental Risk Longitudinal Twin Study to test whether childhood cognitive functioning predicts future MDD risk independent of family-wide and genetic risk using a discordant twin design. Contrary to both hypotheses, we found that childhood cognitive functioning did not predict future risk of MDD, nor did study members with a past history of MDD show evidence of greater cognitive decline unless MDD was accompanied by other comorbid psychiatric conditions. Our results thus suggest that low cognitive functioning is related to comorbidity, but is neither an antecedent nor an enduring consequence of MDD. Future research may benefit from considering cognitive deficits that occur during depressive episodes from a transdiagnostic perspective.

Disentangling the relationship between child maltreatment and violent delinquency: using a nationally representative sample.

PubMed

Yun, Ilhong; Ball, Jeremy D; Lim, Hyeyoung

2011-01-01

This study uses the National Longitudinal Study of Adolescents (Add Health) data, a nationally representative sample of adolescents, to disentangle the relationship between child maltreatment and violent delinquency. Also examined are potential moderating effects of gender, socioeconomic status (SES), and religiosity on the association between child maltreatment and violent delinquency. Contrary to prior research findings, the current analyses reveal that physical abuse is not associated with future violent delinquency, whereas sexual abuse and neglect predict violent delinquency significantly. The current study also did not reveal any moderating effects of gender, SES, and religiosity on the association between maltreatment and violent delinquency. Interpretations of these findings are presented, drawing on the properties of the national probability sample compared to the findings of most prior studies that used localized samples.

Longitudinal Study of Reproductive Performance of Female Cattle Produced by Somatic Cell Nuclear Transfer

PubMed Central

Polejaeva, Irina A.; Broek, Diane M.; Walker, Shawn C.; Zhou, Wenli; Walton, Mark; Benninghoff, Abby D.; Faber, David C.

2013-01-01

The objective of this study was to determine whether or not reproductive performance in cattle produced by somatic cell nuclear transfer (SCNT) is significantly different from that of their genetic donors. To address this question, we directed two longitudinal studies using different embryo production procedures: (1) superovulation followed by artificial insemination (AI) and embryo collection and (2) ultrasound-guided ovum pick-up followed by in vitro fertilization (OPU-IVF). Collectively, these two studies represent the largest data set available for any species on the reproductive performance of female clones and their genetic donors as measured by their embryo production outcomes in commercial embryo production program. The large-scale study described herein was conducted over a six-year period of time and provides a unique comparison of 96 clones to the 40 corresponding genetic donors. To our knowledge, this is the first longitudinal study on the reproductive performance of cattle clones using OPU-IVF. With nearly 2,000 reproductive procedures performed and more than 9,200 transferable embryos produced, our observations show that the reproductive performance of cattle produced by SCNT is not different compared to their genetic donors for the production of transferable embryos after either AI followed by embryo collection (P = 0.77) or OPU-IVF (P = 0.97). These data are in agreement with previous reports showing that the reproductive capabilities of cloned cattle are equal to that of conventionally produced cattle. In conclusion, results of this longitudinal study once again demonstrate that cloning technology, in combination with superovulation, AI and embryo collection or OPU-IVF, provides a valuable tool for faster dissemination of superior maternal genetics. PMID:24391930

Longitudinal study of reproductive performance of female cattle produced by somatic cell nuclear transfer.

PubMed

Polejaeva, Irina A; Broek, Diane M; Walker, Shawn C; Zhou, Wenli; Walton, Mark; Benninghoff, Abby D; Faber, David C

2013-01-01

The objective of this study was to determine whether or not reproductive performance in cattle produced by somatic cell nuclear transfer (SCNT) is significantly different from that of their genetic donors. To address this question, we directed two longitudinal studies using different embryo production procedures: (1) superovulation followed by artificial insemination (AI) and embryo collection and (2) ultrasound-guided ovum pick-up followed by in vitro fertilization (OPU-IVF). Collectively, these two studies represent the largest data set available for any species on the reproductive performance of female clones and their genetic donors as measured by their embryo production outcomes in commercial embryo production program. The large-scale study described herein was conducted over a six-year period of time and provides a unique comparison of 96 clones to the 40 corresponding genetic donors. To our knowledge, this is the first longitudinal study on the reproductive performance of cattle clones using OPU-IVF. With nearly 2,000 reproductive procedures performed and more than 9,200 transferable embryos produced, our observations show that the reproductive performance of cattle produced by SCNT is not different compared to their genetic donors for the production of transferable embryos after either AI followed by embryo collection (P = 0.77) or OPU-IVF (P = 0.97). These data are in agreement with previous reports showing that the reproductive capabilities of cloned cattle are equal to that of conventionally produced cattle. In conclusion, results of this longitudinal study once again demonstrate that cloning technology, in combination with superovulation, AI and embryo collection or OPU-IVF, provides a valuable tool for faster dissemination of superior maternal genetics.

Longitudinal expandable shelter for medical response during disasters.

PubMed

Miniati, Roberto; Dori, Fabrizio; Iadanza, Ernesto; Lo Sardo, Marco; Boncinelli, Sergio

2010-01-01

During medical emergencies, hospitals represent the final point of the whole rescue process. Therefore, effective health mobile structures have to be inserted between hospitals and the place of the event with the aim of giving the best of cures (using appropriate and easy to use equipment) for a safer and faster evacuation to hospitals. Literature review and national and international disaster medicine standards were the basis for this study to provide clinical, hygienical, and organizational needs to satisfy for the medical structure design. Project requirements have been obtained by analyzing structural, organizational, and clinical process necessities. Structural requirements respond to the possibility of installation on every ground type, resistance to every weather condition, and necessity of easy and fast transportation. Technological equipment is obtained from clinical evaluation for patient stabilization. The designed structure results to be a longitudinal expandable shelter (LES) for medical emergencies response organized in three internal functional areas. Possibility of automatic expandability allows rapid transportation and easy deployment. The functional internal organization provides three areas: "Diagnostic," "Therapeutic," and "Pre-evacuation monitoring." Further, longitudinal expandability supports the basic hygienical rules in healthcare processes allowing the unidirectional flow of casualties from dirtier to cleaner areas of the structure. LES represents the answer to expressed requisites by disaster medicine standards and guidelines. It aims to provide an efficient and effective support for sanitary aid in response to disasters or emergencies, by improving aspects related to effectiveness, hygiene, and quality of clinical performances especially for highest critical cases.

A longitudinal study of occlusal caries in Newark New Jersey school children: relationship between initial dental finding and the development of new lesions

PubMed Central

Markowitz, Kenneth; Fairlie, Karen; Ferrandiz, Javier; Nasri-Heir, Cibele

2012-01-01

Objective Dental caries is a significant public health problem especially amongst children from low-income backgrounds. This longitudinal study examined the development of new occlusal caries in 227 Newark, NJ children ages 10–18. The role of previous caries experience and the presence of occlusal white and dark lesions in predicting the development of new lesions were examined. Design At each visit, the patient’s teeth were given a visual-tactile examination and the subject’s decayed; missing and filled (DMFS) score was determined. Next, molars lacking probeable caries or restorations were examined using transillumination for occlusal white and dark spots. This examination was repeated periodically. A Cox proportional hazard was used to analyze data concerning the development of new occusal caries in molars. Results The longitudinal data indicates that patients who were caries free at visit-1 developed significantly fewer occlusal caries during the longitudinal study. The hazard ratio for subjects who had first-visit caries was 2.27 compared to caries free subjects. Intact molars with occlusal white or dark lesions had caries hazard ratios of 0.78 and 1.49 respectively, compared to molars lacking initial color changes. Conclusion Having a prior caries history places the subject at increased risk of developing future caries. Teeth with dark lesions but not white lesions are at significantly increased risk for developing decay. White lesions may represent remineralizing or slowly progressing lesions. The results of this study can help identify patients and tooth surfaces at risk for future occlusal decay. PMID:22841633

Normative values of cognitive and physical function in older adults: findings from the Irish Longitudinal Study on Ageing.

PubMed

Kenny, Rose Anne; Coen, Robert F; Frewen, John; Donoghue, Orna A; Cronin, Hilary; Savva, George M

2013-05-01

To provide normative values of tests of cognitive and physical function based on a large sample representative of the population of Ireland aged 50 and older. Data were used from the first wave of The Irish Longitudinal Study on Ageing (TILDA), a prospective cohort study that includes a comprehensive health assessment. Health assessment was undertaken at one of two dedicated health assessment centers or in the study participant's home if travel was not practicable. Five thousand eight hundred ninety-seven members of a nationally representative sample of the community-living population of Ireland aged 50 and older. Those with severe cognitive impairment, dementia, or Parkinson's disease were excluded. Measurements included height and weight, normal walking speed, Timed Up-and-Go, handgrip strength, Mini-Mental State Examination (MMSE), Montreal Cognitive Assessment (MoCA), Color Trails Test, and bone mineral density. Normative values were estimated using generalized additive models for location shape and scale (GAMLSS) and are presented as percentiles, means, and standard deviations. Generalized additive models for location shape and scale fit the observed data well for each measure, leading to reliable estimates of normative values. Performance on all tasks decreased with age. Educational attainment was a strong determinant of performance on all cognitive tests. Tests of walking speed were dependent on height. Distribution of body mass index did not change with age, owing to simultaneous declines in weight and height. Normative values were found for tests of many aspects of cognitive and physical function based on a representative sample of the general older Irish population. © 2013, Copyright the Authors Journal compilation © 2013, The American Geriatrics Society.

Doubly Disadvantaged? Bullying Experiences among Disabled Children and Young People in England

PubMed Central

Chatzitheochari, Stella; Parsons, Samantha; Platt, Lucinda

2015-01-01

Bullying among school-aged children and adolescents is recognised as an important social problem, and the adverse consequences for victims are well established. However, despite growing interest in the socio-demographic profile of victims, there is limited evidence on the relationship between bullying victimisation and childhood disability. This article enhances our understanding of bullying experiences among disabled children in both early and later childhood, drawing on nationally representative longitudinal data from the Millennium Cohort Study and the Longitudinal Study of Young People in England. We model the association of disability measured in two different ways with the probability of being bullied at ages seven and 15, controlling for a wide range of known risk factors that vary with childhood disability. Results reveal an independent association of disability with bullying victimisation, suggesting a potential pathway to cumulative disability-related disadvantage, and drawing attention to the school as a site of reproduction of social inequalities. PMID:27546915

Population density and youth antisocial behavior.

PubMed

Harden, K Paige; D'Onofrio, Brian M; Van Hulle, Carol; Turkheimer, Eric; Rodgers, Joseph L; Waldman, Irwin D; Lahey, Benjamin B

2009-08-01

Theoretical models concerning how neighborhood contexts adversely influence juvenile antisocial behavior frequently focus on urban neighborhoods; however, previous studies comparing urban and rural areas on the prevalence of youth antisocial behavior have yielded mixed results. The current study uses longitudinal data on the offspring of a nationally representative sample of mothers (N = 4,886) in the US. There was no relation between density and mother-reported child conduct problems across ages 4-13 years, but youth living in areas of greater population density exhibited more youth self-reported delinquency across 10-17 years. Families often moved to counties with greater or lesser population density, but longitudinal analyses treating population density as a time-varying covariate did not support the hypothesis that living in densely populated counties influenced youth delinquency. Rather, the association between population density and delinquency appears to be due to unmeasured selection variables that differ between families who live in more or less densely populated counties.

Does the Sale of Sweetened Beverages at School Affect Children’s Weight?

PubMed Central

Cunningham, Solveig A.; Zavodny, Madeline

2011-01-01

In response to the increase in children’s weight in recent decades, many states, school districts, and schools in the United States have limited or eliminated the sale of sweetened beverages at school. These policies are promoted for their potential to reduce childhood overweight and obesity, but their effectiveness has not been evaluated. Using a large nationally representative longitudinal dataset, the Early Childhood Longitudinal Study-Kindergarten (ECLS-K), this study explores the relationship between children’s access to sweetened beverages at school in 5th and 8th grade, their purchases and total consumption of these beverages, and their weight. We find almost no evidence that availability of sweetened beverages for sale at school leads to heavier weight or greater risk of overweight or obesity among children. We also find limited evidence that availability of sweetened beverages for sale at school leads to higher total consumption of these beverages. PMID:21907477

Integrating molecular diagnostic and flow cytometric reporting for improved longitudinal monitoring of HIV patients.

PubMed Central

Asare, A. L.; Huda, H.; Klimczak, J. C.; Caldwell, C. W.

1998-01-01

Studies have shown that monitoring HIV-infected patients undergoing antiretroviral therapy is best represented by combined measurement of plasma HIV-1 RNA and CD4+ T-lymphocytes [1]. This pilot study at the University of Missouri-Columbia integrates molecular diagnostic and flow cytometric data reporting to provide current and historical HIV-1 RNA levels and CD4+ T-cell counts. The development of a single database for storage and retrieval of these values facilitates composite report generation that includes longitudinal HIV-1 RNA levels and CD4+ T-cell counts for all patients. Results are displayed in tables and plotted graphically within a web browser. This method of data presentation converts individual data points to more useful medical information and could provide clinicians with decision support for improved monitoring of HIV patients undergoing antiretroviral therapy. Images Figure 2 Figure 3 Figure 4 PMID:9929359

Parent- and child-driven effects during the transition to adolescence: a longitudinal, genetic analysis of the home environment.

PubMed

Hannigan, Laurie J; McAdams, Tom A; Plomin, Robert; Eley, Thalia C

2017-09-01

Theoretical models of child development typically consider the home environment as a product of bidirectional effects, with parent- and child-driven processes operating interdependently. However, the developmental structure of these processes during the transition from childhood to adolescence has not been well studied. In this study we used longitudinal genetic analyses of data from 6646 UK-representative twin pairs (aged 9-16 years) to investigate stability and change in parenting and household chaos in the context of parent-child bidirectional effects. Stability in the home environment was modest, arising mainly from parent-driven processes and family-wide influences. In contrast, change over time was more influenced by child-driven processes, indicated by significant age-specific genetic influences. Interpretations of these results and their implications for researchers are discussed. © 2016 The Authors. Developmental Science Published by John Wiley & Sons Ltd.

Does the sale of sweetened beverages at school affect children's weight?

PubMed

Cunningham, Solveig A; Zavodny, Madeline

2011-11-01

In response to the increase in children's weight in recent decades, many states, school districts, and schools in the United States have limited or eliminated the sale of sweetened beverages at school. These policies are promoted for their potential to reduce childhood overweight and obesity, but their effectiveness has not been evaluated. Using a large nationally representative longitudinal dataset, the Early Childhood Longitudinal Study-Kindergarten (ECLS-K), this study explores the relationship between children's access to sweetened beverages at school in 5th and 8th grade, their purchases and total consumption of these beverages, and their weight. We find almost no evidence that availability of sweetened beverages for sale at school leads to heavier weight or greater risk of overweight or obesity among children. We also find limited evidence that availability of sweetened beverages for sale at school leads to higher total consumption of these beverages. Copyright © 2011 Elsevier Ltd. All rights reserved.

Doubly Disadvantaged? Bullying Experiences among Disabled Children and Young People in England.

PubMed

Chatzitheochari, Stella; Parsons, Samantha; Platt, Lucinda

2016-08-01

Bullying among school-aged children and adolescents is recognised as an important social problem, and the adverse consequences for victims are well established. However, despite growing interest in the socio-demographic profile of victims, there is limited evidence on the relationship between bullying victimisation and childhood disability. This article enhances our understanding of bullying experiences among disabled children in both early and later childhood, drawing on nationally representative longitudinal data from the Millennium Cohort Study and the Longitudinal Study of Young People in England. We model the association of disability measured in two different ways with the probability of being bullied at ages seven and 15, controlling for a wide range of known risk factors that vary with childhood disability. Results reveal an independent association of disability with bullying victimisation, suggesting a potential pathway to cumulative disability-related disadvantage, and drawing attention to the school as a site of reproduction of social inequalities.

The Cusp Catastrophe Model as Cross-Sectional and Longitudinal Mixture Structural Equation Models

PubMed Central

Chow, Sy-Miin; Witkiewitz, Katie; Grasman, Raoul P. P. P.; Maisto, Stephen A.

2015-01-01

Catastrophe theory (Thom, 1972, 1993) is the study of the many ways in which continuous changes in a system’s parameters can result in discontinuous changes in one or several outcome variables of interest. Catastrophe theory–inspired models have been used to represent a variety of change phenomena in the realm of social and behavioral sciences. Despite their promise, widespread applications of catastrophe models have been impeded, in part, by difficulties in performing model fitting and model comparison procedures. We propose a new modeling framework for testing one kind of catastrophe model — the cusp catastrophe model — as a mixture structural equation model (MSEM) when cross-sectional data are available; or alternatively, as an MSEM with regime-switching (MSEM-RS) when longitudinal panel data are available. The proposed models and the advantages offered by this alternative modeling framework are illustrated using two empirical examples and a simulation study. PMID:25822209

Dynamic of Change in Pathological Personality Trait Dimensions: A Latent Change Analysis Among at-Risk Women

PubMed Central

Barbot, Baptiste; Hunter, Scott R.; Grigorenko, Elena L.; Luthar, Suniya S.

2012-01-01

This study explores longitudinally a four-factor structure of pathological personality trait dimensions (PPTDs) to examine both its structural stability and intra-individual changes among PPTDs over time. Personality Disorder (PD) scales of the Millon Clinical Multiaxial Inventory-III were administered to 361 low-income women with various psychiatric conditions (drug dependence, depression), who were followed in a two-wave study over 5-years. Cross-sectional and longitudinal factor analyses outlined a robust factorial structure of PPTDs, extrinsically invariant over time, representing Negative Emotionality, Introversion, Antagonism and Impulsivity. Despite moderate rank-order stability in the PPTDs, results also indicated substantial intra-individual variability in the degree and direction of change, consistent with trajectories of change in participants’ clinical diagnoses. Results are discussed in light of current debates on the structure and dynamic of pathological personality. PMID:23710108

Area-level unemployment and perceived job insecurity: evidence from a longitudinal survey conducted in the Australian working-age population.

PubMed

Milner, Allison; Kavanagh, Anne; Krnjacki, Lauren; Bentley, Rebecca; LaMontagne, Anthony D

2014-03-01

RESEARCH SIGNIFICANCE: Job insecurity, the subjective individual anticipation of involuntary job loss, negatively affects employees' health and their engagement. Although the relationship between job insecurity and health has been extensively studied, job insecurity as an 'exposure' has received far less attention, with little known about the upstream determinants of job insecurity in particular. This research sought to identify the relationship between self-rated job insecurity and area-level unemployment using a longitudinal, nationally representative study of Australian households. Mixed-effect multi-level regression models were used to assess the relationship between area-based unemployment rates and self-reported job insecurity using data from a longitudinal, nationally representative survey running since 2001. Interaction terms were included to test the hypotheses that the relationship between area-level unemployment and job insecurity differed between occupational skill-level groups and by employment arrangement. Marginal effects were computed to visually depict differences in job insecurity across areas with different levels of unemployment. Results indicated that areas with the lowest unemployment rates had significantly lower job insecurity (predicted value 2.74; 95% confidence interval (CI) 2.71-2.78, P < 0.001) than areas with higher unemployment (predicted value 2.81; 95% CI 2.79-2.84, P < 0.001). There was a stronger relationship between area-level unemployment and job insecurity among precariously and fixed-term employed workers than permanent workers. These findings demonstrate the independent influences of prevailing economic conditions, individual- and job-level factors on job insecurity. Persons working on a casual basis or on a fixed-term contract in areas with higher levels of unemployment are more susceptible to feelings of job insecurity than those working permanently.

Association between kindergarten and first-grade food insecurity and weight status in U.S. children.

PubMed

Lee, Arthur M; Scharf, Rebecca J; DeBoer, Mark D

The aim of this study was to determine if food insecurity is an independent risk factor for obesity in U.S. children. We analyzed data from a nationally representative sample of children participating in the Early Childhood Longitudinal Study-Kindergarten Cohort 2011. Statistical analyses were performed to evaluate longitudinal associations between food security and body mass index (BMI) z-score. All regression models included race/ethnicity, household income, and parental education. Survey and anthropometric data was collected from teachers and parents of 8167 U.S. children entering kindergarten in fall 2010 with regular follow-up through third grade. Complete data regarding food security, socioeconomic assessment, and BMI z-score data were included for statistical analyses. All analyses were weighted to be nationally representative. Children with household food insecurity had increased obesity prevalence from kindergarten through grade 3; for example, at kindergarten, with food insecurity 16.4% (95% confidence interval [CI], 13.7-19) versus food secure 12.4% (95% CI, 11.3-13.6). Adjusted means analysis showed first-grade food insecurity was significantly correlated with increased BMI z-score in first through third grades; for example, at first grade, with food insecurity 0.6 (95% CI, 0.5-0.7) versus food secure 0.4 (95% CI, 0.4-0.5). Logistic regression showed first-grade food insecurity was correlated with increased risk for obesity in that grade (odds ratio 1.4; 95% CI, 1.1-2). Obesity is more prevalent among food-insecure children. First-grade food insecurity is an independent risk factor for longitudinal increases in BMI z-score. There are differences in the association between food insecurity and weight status between kindergarten and first grade. Copyright © 2018 Elsevier Inc. All rights reserved.

Self-Concept Predicts Academic Achievement Across Levels of the Achievement Distribution: Domain Specificity for Math and Reading.

PubMed

Susperreguy, Maria Ines; Davis-Kean, Pamela E; Duckworth, Kathryn; Chen, Meichu

2017-09-18

This study examines whether self-concept of ability in math and reading predicts later math and reading attainment across different levels of achievement. Data from three large-scale longitudinal data sets, the Avon Longitudinal Study of Parents and Children, National Institute of Child Health and Human Development-Study of Early Child Care and Youth Development, and Panel Study of Income Dynamics-Child Development Supplement, were used to answer this question by employing quantile regression analyses. After controlling for demographic variables, child characteristics, and early ability, the findings indicate that self-concept of ability in math and reading predicts later achievement in each respective domain across all quantile levels of achievement. These results were replicated across the three data sets representing different populations and provide robust evidence for the role of self-concept of ability in understanding achievement from early childhood to adolescence across the spectrum of performance (low to high). © 2017 The Authors. Child Development © 2017 Society for Research in Child Development, Inc.

Persistent cannabis dependence and alcohol dependence represent risks for midlife economic and social problems: A longitudinal cohort study

PubMed Central

Cerdá, Magdalena; Moffitt, Terrie E.; Meier, Madeline H.; Harrington, HonaLee; Houts, Renate; Ramrakha, Sandhya; Hogan, Sean; Poulton, Richie; Caspi, Avshalom

2016-01-01

With the increasing legalization of cannabis, understanding the consequences of cannabis use is particularly timely. We examined the association between cannabis use and dependence, prospectively assessed between ages 18–38, and economic and social problems at age 38. We studied participants in the Dunedin Longitudinal Study, a cohort (n=1,037) followed from birth to age 38. Study members with regular cannabis use and persistent dependence experienced downward socioeconomic mobility, more financial difficulties, workplace problems, and relationship conflict in early midlife. Cannabis dependence was not linked to traffic-related convictions. Associations were not explained by socioeconomic adversity, childhood psychopathology, achievement orientation, or family structure; cannabis-related criminal convictions; early onset of cannabis dependence; or comorbid substance dependence. Cannabis dependence was associated with more financial difficulties than alcohol dependence; no difference was found in risks for other economic or social problems. Cannabis dependence is not associated with fewer harmful economic and social problems than alcohol dependence. PMID:28008372

Evaluation of an advanced directionally solidified gamma/gamma'-alpha Mo eutectic alloy

NASA Technical Reports Server (NTRS)

Henry, M. F.; Jackson, M. R.; Gigliotti, M. F. X.; Nelson, P. B.

1979-01-01

An attempt was made to improve on the properties of the candidate jet engine turbine blade material AG-60, a gamma/gamma prime-alpha Mo eutectic composite. Alloy 38 (AG-170) was evaluated in the greatest detail. This alloy, Ni-5.88 A1-29.74 Mo-1.65 V-1.2C Re (weight percent), represents an improvement beyond AG-60, based on mechanical testing of the transverse and/or longitudinal orientations over a range of temperatures in tension, shear, rupture, and rupture after thermal exposure. It is likely that other alloys in the study represent a similar improvement.

Longitudinal Antigenic Sequences and Sites from Intra-Host Evolution (LASSIE) identifies immune-selected HIV variants

DOE PAGES

Hraber, Peter; Korber, Bette; Wagh, Kshitij; ...

2015-10-21

Within-host genetic sequencing from samples collected over time provides a dynamic view of how viruses evade host immunity. Immune-driven mutations might stimulate neutralization breadth by selecting antibodies adapted to cycles of immune escape that generate within-subject epitope diversity. Comprehensive identification of immune-escape mutations is experimentally and computationally challenging. With current technology, many more viral sequences can readily be obtained than can be tested for binding and neutralization, making down-selection necessary. Typically, this is done manually, by picking variants that represent different time-points and branches on a phylogenetic tree. Such strategies are likely to miss many relevant mutations and combinations ofmore » mutations, and to be redundant for other mutations. Longitudinal Antigenic Sequences and Sites from Intrahost Evolution (LASSIE) uses transmitted founder loss to identify virus “hot-spots” under putative immune selection and chooses sequences that represent recurrent mutations in selected sites. LASSIE favors earliest sequences in which mutations arise. Here, with well-characterized longitudinal Env sequences, we confirmed selected sites were concentrated in antibody contacts and selected sequences represented diverse antigenic phenotypes. Finally, practical applications include rapidly identifying immune targets under selective pressure within a subject, selecting minimal sets of reagents for immunological assays that characterize evolving antibody responses, and for immunogens in polyvalent “cocktail” vaccines.« less

Students with Special Educational Needs--Social Inclusion or Marginalisation? Factors of Risk and Resilience in the Transition between School and Early Adult Life

ERIC Educational Resources Information Center

Kvalsund, Rune; Bele, Irene Velsvik

2010-01-01

This article is based on data from two national research projects in Norway dealing with upper secondary educational reforms that began in 1994. Together, the research projects represent a longitudinal study of prospective life course data from 1995 to 2003, covering approximately 500 students from the time they were receiving special education in…

Everything under Control? The Effects of Age, Gender, and Education on Trajectories of Perceived Control in a Nationally Representative German Sample

ERIC Educational Resources Information Center

Specht, Jule; Egloff, Boris; Schmukle, Stefan C.

2013-01-01

Perceived control is an important variable for various demands involved in successful aging. However, perceived control is not set in stone but rather changes throughout the life course. The aim of this study was to identify cross-sectional age differences and longitudinal mean-level changes as well as rank-order changes in perceived control with…

A Longitudinal Analysis of the Extent and Manner of Representations of Nature of Science in U.S. High School Biology and Physics Textbooks

ERIC Educational Resources Information Center

Abd-El-Khalick, Fouad; Myers, John Y.; Summers, Ryan; Brunner, Jeanne; Waight, Noemi; Wahbeh, Nader; Zeineddin, Ava A.; Belarmino, Jeremy

2017-01-01

This study assessed the (i) ways in which, and extent to which, several aspects of nature of science (NOS) are represented in high school biology and physics textbooks in the United States (U.S.); (ii) extent to which these representations have changed over the course of several decades; and (iii) relative impact of discipline, and textbook…

The Association Between Cognitive Function and Subsequent Depression: A Systematic Review and Meta-Analysis

PubMed Central

Scult, Matthew A.; Paulli, Athelia R.; Mazure, Emily S.; Moffitt, Terrie E.; Hariri, Ahmad R.; Strauman, Timothy J.

2016-01-01

Despite a growing interest in understanding the cognitive deficits associated with major depressive disorder (MDD), it is largely unknown whether such deficits exist before disorder onset or how they might influence the severity of subsequent illness. The purpose of the present study was to conduct a systematic review and meta-analysis of longitudinal datasets to determine whether cognitive function acts as a predictor of later MDD diagnosis or change in depression symptoms. Eligible studies included longitudinal designs with baseline measures of cognitive functioning, and later unipolar MDD diagnosis or symptom assessment. The systematic review identified 29 publications, representing 34 unique samples, and 121,749 participants, that met the inclusion/exclusion criteria. Quantitative meta-analysis demonstrated that higher cognitive function was associated with decreased levels of subsequent depression (r=−0.088; 95% CI: −0.121, −0.054; p<0.001). However, sensitivity analyses revealed that this association is likely driven by concurrent depression symptoms at the time of cognitive assessment. Our review and meta-analysis indicate that the association between lower cognitive function and later depression is confounded by the presence of contemporaneous depression symptoms at the time of cognitive assessment. Thus, cognitive deficits predicting MDD likely represent deleterious effects of subclinical depression symptoms on performance rather than premorbid risk factors for disorder. PMID:27624847

Elevated incidence rates of diabetes in Peru: report from PERUDIAB, a national urban population-based longitudinal study

PubMed Central

Seclen, Segundo Nicolas; Rosas, Moises Ernesto; Arias, Arturo Jaime; Medina, Cecilia Alexandra

2017-01-01

Objective A recent report from a non-nationally representative, geographically diverse sample in four separate communities in Peru suggests an unusually high diabetes incidence. We aimed to estimate the national diabetes incidence rate using PERUDIAB, a probabilistic, national urban population-based longitudinal study. Research design and methods 662 subjects without diabetes, selected by multistage, cluster, random sampling of households, representing the 24 administrative and the 3 (coast, highlands and jungle) natural regions across the country, from both sexes, aged 25+ years at baseline, enrolled in 2010–2012, were followed for 3.8 years. New diabetes cases were defined as fasting blood glucose ≥126 mg/dL or on medical diabetes treatment. Results There were 49 cases of diabetes in 2408 person-years follow-up. The weighted cumulative incidence of diabetes was 7.2% while the weighted incidence rate was estimated at 19.5 (95% CI 13.9 to 28.3) new cases per 1000 person-years. Older age, obesity and technical or higher education were statistically associated with the incidence of diabetes. Conclusion Our results confirm that the incidence of diabetes in Peru is among the highest reported globally. The fast economic growth in the last 20 years, high overweight and obesity rates may have triggered this phenomenon. PMID:28878935

Elevated incidence rates of diabetes in Peru: report from PERUDIAB, a national urban population-based longitudinal study.

PubMed

Seclen, Segundo Nicolas; Rosas, Moises Ernesto; Arias, Arturo Jaime; Medina, Cecilia Alexandra

2017-01-01

A recent report from a non-nationally representative, geographically diverse sample in four separate communities in Peru suggests an unusually high diabetes incidence. We aimed to estimate the national diabetes incidence rate using PERUDIAB, a probabilistic, national urban population-based longitudinal study. 662 subjects without diabetes, selected by multistage, cluster, random sampling of households, representing the 24 administrative and the 3 (coast, highlands and jungle) natural regions across the country, from both sexes, aged 25+ years at baseline, enrolled in 2010-2012, were followed for 3.8 years. New diabetes cases were defined as fasting blood glucose ≥126 mg/dL or on medical diabetes treatment. There were 49 cases of diabetes in 2408 person-years follow-up. The weighted cumulative incidence of diabetes was 7.2% while the weighted incidence rate was estimated at 19.5 (95% CI 13.9 to 28.3) new cases per 1000 person-years. Older age, obesity and technical or higher education were statistically associated with the incidence of diabetes. Our results confirm that the incidence of diabetes in Peru is among the highest reported globally. The fast economic growth in the last 20 years, high overweight and obesity rates may have triggered this phenomenon.

Reading and math achievement profiles and longitudinal growth trajectories of children with an autism spectrum disorder.

PubMed

Wei, Xin; Christiano, Elizabeth R A; Yu, Jennifer W; Wagner, Mary; Spiker, Donna

2015-02-01

This study examined the reading and math achievement profiles and longitudinal growth trajectories of a nationally representative sample of children ages 6 through 9 with an autism spectrum disorder. Four distinct achievement profiles were identified: higher-achieving (39%), hyperlexia (9%), hypercalculia (20%) and lower-achieving (32%). Children with hypercalculia and lower-achieving profiles were more likely to be from low socioeconomic families and had lower functional cognitive skills than the higher-achieving profile. All four profiles lost ground in passage comprehension over time. Slower improvement occurred for the higher-achieving group on letter-word identification, the hyperlexia group on conversation abilities and the hypercalculia group on calculation and functional cognitive skills relative to the lower-achieving group. © The Author(s) 2014.

Longitudinal optical monitoring of blood flow in breast tumors during neoadjuvant chemotherapy

NASA Astrophysics Data System (ADS)

Cochran, J. M.; Chung, S. H.; Leproux, A.; Baker, W. B.; Busch, D. R.; DeMichele, A. M.; Tchou, J.; Tromberg, B. J.; Yodh, A. G.

2017-06-01

We measure tissue blood flow markers in breast tumors during neoadjuvant chemotherapy and investigate their correlation to pathologic complete response in a pilot longitudinal patient study (n  =  4). Tumor blood flow is quantified optically by diffuse correlation spectroscopy (DCS), and tissue optical properties, blood oxygen saturation, and total hemoglobin concentration are derived from concurrent diffuse optical spectroscopic imaging (DOSI). The study represents the first longitudinal DCS measurement of neoadjuvant chemotherapy in humans over the entire course of treatment; it therefore offers a first correlation between DCS flow indices and pathologic complete response. The use of absolute optical properties measured by DOSI facilitates significant improvement of DCS blood flow calculation, which typically assumes optical properties based on literature values. Additionally, the combination of the DCS blood flow index and the tissue oxygen saturation from DOSI permits investigation of tissue oxygen metabolism. Pilot results from four patients suggest that lower blood flow in the lesion-bearing breast is correlated with pathologic complete response. Both absolute lesion blood flow and lesion flow relative to the contralateral breast exhibit potential for characterization of pathological response. This initial demonstration of the combined optical approach for chemotherapy monitoring provides incentive for more comprehensive studies in the future and can help power those investigations.

Dynamic interplay between merger process justice and cognitive trust in top management: A longitudinal study.

PubMed

Kaltiainen, Janne; Lipponen, Jukka; Holtz, Brian C

2017-04-01

This study examines two fundamental concerns in the context of organizational change: employees' perceptions of merger process justice and cognitive trust in the top management team. Our main purpose is to better understand the nature of reciprocal relations between these important constructs through a significant change event. Previous research, building mainly on social exchange theory, has framed trust as a consequence of justice perceptions. More recently, scholars have suggested that this view may be overly simplistic and that trust-related cognitions may also represent an important antecedent of justice perceptions. Using 3-wave longitudinal survey data (N = 622) gathered during a merger process, we tested reciprocal relations over time between cognitive trust in the top management team and perceptions of the merger process justice. In contrast to the conventional unidirectional notion of trust or trust-related cognitions as outcomes of perceived justice, our results show positive reciprocal relations over time between cognitive trust and justice. Our findings also revealed that the positive influence of cognitive trust on subsequent justice perceptions was slightly more robust than the opposite direction. By examining cross-lagged longitudinal relations between these critical psychological reactions, this study contributes across multiple domains of the management literature including trust, justice, and organizational mergers. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

Big data in Parkinson's disease: using smartphones to remotely detect longitudinal disease phenotypes.

PubMed

Prince, John; Arora, Siddharth; de Vos, Maarten

2018-04-26

To better understand the longitudinal characteristics of Parkinson's disease (PD) through the analysis of finger tapping and memory tests collected remotely using smartphones. Using a large cohort (312 PD subjects and 236 controls) of participants in the mPower study, we extract clinically validated features from a finger tapping and memory test to monitor the longitudinal behaviour of study participants. We investigate any discrepancy in learning rates associated with motor and non-motor tasks between PD subjects and healthy controls. The ability of these features to predict self-assigned severity measures is assessed whilst simultaneously inspecting the severity scoring system for floor-ceiling effects. Finally, we study the relationship between motor and non-motor longitudinal behaviour to determine if separate aspects of the disease are dependent on one another. We find that the test performances of the most severe subjects show significant correlations with self-assigned severity measures. Interestingly, less severe subjects do not show significant correlations, which is shown to be a consequence of floor-ceiling effects within the mPower self-reporting severity system. We find that motor performance after practise is a better predictor of severity than baseline performance suggesting that starting performance at a new motor task is less representative of disease severity than the performance after the test has been learnt. We find PD subjects show significant impairments in motor ability as assessed through the alternating finger tapping (AFT) test in both the short- and long-term analyses. In the AFT and memory tests we demonstrate that PD subjects show a larger degree of longitudinal performance variability in addition to requiring more instances of a test to reach a steady state performance than healthy subjects. Our findings pave the way forward for objective assessment and quantification of longitudinal learning rates in PD. This can be particularly useful for symptom monitoring and assessing medication response. This study tries to tackle some of the major challenges associated with self-assessed severity labels by designing and validating features extracted from big datasets in PD, which could help identify digital biomarkers capable of providing measures of disease severity outside of a clinical environment.

Measurement of longitudinal electron diffusion in liquid argon

DOE PAGES

Li, Yichen; Tsang, Thomas; Thorn, Craig; ...

2016-02-07

In this paper, we report the measurement of longitudinal electron diffusion coefficients in liquid argon for electric fields between 100 and 2000 V/cm with a gold photocathode as a bright electron source. The measurement principle, apparatus, and data analysis are described. In the region between 100 and 350 V/cm, our results show a discrepancy with the previous measurement. In the region between 350 and 2000 V/cm, our results represent the world's best measurement. Over the entire measured electric field range, our results are systematically higher than the calculation of Atrazhev-Timoshkin. The quantum efficiency of the gold photocathode, the drift velocitymore » and longitudinal diffusion coefficients in gas argon are also presented.« less

The Longitudinal Relation of Stress during the Menopausal Transition to Fibrinogen Concentrations: Results from the Study of Women's Health Across the Nation

PubMed Central

Falconi, April M.; Gold, Ellen B.; Janssen, Imke

2015-01-01

Objective Life course theory suggests that exposures during critical or sensitive periods have particularly profound effects on health. Most research on this subject has focused on the occurrence of such windows early in life. We investigated whether perimenopause, a period of dramatic neuroendocrine changes at midlife, represents a sensitive period for response to stress by evaluating the relation of perceived stress to fibrinogen, a biomarker for inflammation. Methods The study sample was comprised of participants in the Study of Women's Health Across the Nation, a longitudinal study on women's health during the menopausal transition (n=3,287). We fitted linear mixed effects models to estimate the longitudinal relationship between stress and menopausal stage and the association between stress and fibrinogen over the menopausal transition. Results Women in early and late perimenopause reported perceiving higher levels of stress than premenopausal women (p<0.05), adjusted for confounding variables. This increased perception of stress during perimenopause, however, was unrelated to changes in fibrinogen. Conclusions Although neuroendocrine changes during the menopausal transition may exacerbate the negative health effects of stress, the findings of this study do not suggest such interaction, as measured by changes in fibrinogen. The significant association observed between perceived stress and menopausal status may still have important implications, however, given prior literature linking perceived stress with numerous health outcomes. PMID:26886885

[Saarland Growth Study: sampling design].

PubMed

Danker-Hopfe, H; Zabransky, S

2000-01-01

The use of reference data to evaluate the physical development of children and adolescents is part of the daily routine in the paediatric ambulance. The construction of such reference data is based on the collection of extensive reference data. There are different kinds of reference data: cross sectional references, which are based on data collected from a big representative cross-sectional sample of the population, longitudinal references, which are based on follow-up surveys of usually smaller samples of individuals from birth to maturity, and mixed longitudinal references, which are a combination of longitudinal and cross-sectional reference data. The advantages and disadvantages of the different methods of data collection and the resulting reference data are discussed. The Saarland Growth Study was conducted for several reasons: growth processes are subject to secular changes, there are no specific reference data for children and adolescents from this part of the country and the growth charts in use in the paediatric praxis are possibly not appropriate any more. Therefore, the Saarland Growth Study served two purposes a) to create actual regional reference data and b) to create a database for future studies on secular trends in growth processes of children and adolescents from Saarland. The present contribution focusses on general remarks on the sampling design of (cross-sectional) growth surveys and its inferences for the design of the present study.

PLCO Ovarian Phase III Validation Study — EDRN Public Portal

Cancer.gov

Our preliminary data indicate that the performance of CA 125 as a screening test for ovarian cancer can be improved upon by additional biomarkers. With completion of one additional validation step, we will be ready to test the performance of a consensus marker panel in a phase III validation study. Given the original aims of the PLCO trial, we believe that the PLCO represents an ideal longitudinal cohort offering specimens for phase III validation of ovarian cancer biomarkers.

Analytical modeling of transport aircraft crash scenarios to obtain floor pulses

NASA Technical Reports Server (NTRS)

Wittlin, G.; Lackey, D.

1983-01-01

The KRAS program was used to analyze transport aircraft candidate crash scenarios. Aircraft floor pulses and seat/occupant responses are presented. Results show that: (1) longitudinal only pulses can be represented by equivalent step inputs and/or static requirements; (2) the L1649 crash test floor longitudinal pulse for the aft direction (forward inertia) is less than 9g static or an equivalent 5g pulse; aft inertia accelerations are extremely small ((ch76) 3g) for representative crash scenarios; (3) a viable procedure to relate crash scenario floor pulses to standard laboratory dynamic and static test data using state of the art analysis and test procedures was demonstrated; and (4) floor pulse magnitudes are expected to be lower for wide body aircraft than for smaller narrow body aircraft.

Association between media use in adolescence and depression in young adulthood: a longitudinal study.

PubMed

Primack, Brian A; Swanier, Brandi; Georgiopoulos, Anna M; Land, Stephanie R; Fine, Michael J

2009-02-01

Although certain media exposures have been linked to the presence of psychiatric conditions, few studies have investigated the association between media exposure and depression. To assess the longitudinal association between media exposure in adolescence and depression in young adulthood in a nationally representative sample. Longitudinal cohort study. We used the National Longitudinal Survey of Adolescent Health (Add Health) to investigate the relationship between electronic media exposure in 4142 adolescents who were not depressed at baseline and subsequent development of depression after 7 years of follow-up. Main Outcome Measure Depression at follow-up assessed using the 9-item Center for Epidemiologic Studies-Depression Scale. Of the 4142 participants (47.5% female and 67.0% white) who were not depressed at baseline and who underwent follow-up assessment, 308 (7.4%) reported symptoms consistent with depression at follow-up. Controlling for all covariates including baseline Center for Epidemiologic Studies-Depression Scale score, those reporting more television use had significantly greater odds of developing depression (odds ratio [95% confidence interval], 1.08 [1.01-1.16]) for each additional hour of daily television use. In addition, those reporting more total media exposure had significantly greater odds of developing depression (1.05 [1.0004-1.10]) for each additional hour of daily use. We did not find a consistent relationship between development of depressive symptoms and exposure to videocassettes, computer games, or radio. Compared with young men, young women were less likely to develop depression given the same total media exposure (odds ratio for interaction term, 0.93 [0.88-0.99]). Television exposure and total media exposure in adolescence are associated with increased odds of depressive symptoms in young adulthood, especially in young men.

Stressful Life Events, Anxiety Sensitivity, and Internalizing Symptoms in Adolescents

PubMed Central

McLaughlin, Katie A.; Hatzenbuehler, Mark L.

2010-01-01

Anxiety sensitivity represents a robust risk factor for the development of anxiety symptoms among both adolescents and adults. However, the development of anxiety sensitivity among adolescents remains inadequately understood. In this study, the authors examined the role of stressful life events as a risk factor for the development of elevated anxiety sensitivity. Anxiety sensitivity was then examined in a longitudinal design as a mechanism linking stressful life events to changes in anxiety symptoms. Stressful life events, anxiety sensitivity, and internalizing symptoms were assessed in a diverse community sample of adolescents (N = 1,065) at 3 time points spanning 7 months. The results indicated that stressful life events were longitudinally associated with increases in anxiety sensitivity and that certain types of stressful life events, specifically events related to health and events related to family discord, were differentially predictive of increases in anxiety sensitivity. Moreover, anxiety sensitivity mediated the longitudinal relation between stressful life events and anxiety symptoms. Evidence was also found for the predictive specificity of anxiety sensitivity to symptoms of anxiety but not depression. PMID:19685962

Stressful life events, anxiety sensitivity, and internalizing symptoms in adolescents.

PubMed

McLaughlin, Katie A; Hatzenbuehler, Mark L

2009-08-01

Anxiety sensitivity represents a robust risk factor for the development of anxiety symptoms among both adolescents and adults. However, the development of anxiety sensitivity among adolescents remains inadequately understood. In this study, the authors examined the role of stressful life events as a risk factor for the development of elevated anxiety sensitivity. Anxiety sensitivity was then examined in a longitudinal design as a mechanism linking stressful life events to changes in anxiety symptoms. Stressful life events, anxiety sensitivity, and internalizing symptoms were assessed in a diverse community sample of adolescents (N = 1,065) at 3 time points spanning 7 months. The results indicated that stressful life events were longitudinally associated with increases in anxiety sensitivity and that certain types of stressful life events, specifically events related to health and events related to family discord, were differentially predictive of increases in anxiety sensitivity. Moreover, anxiety sensitivity mediated the longitudinal relation between stressful life events and anxiety symptoms. Evidence was also found for the predictive specificity of anxiety sensitivity to symptoms of anxiety but not depression.

Using Rasch motor FIM individual growth curves to inform clinical decisions for persons with paraplegia.

PubMed

Pretz, C R; Kozlowski, A J; Charlifue, S; Chen, Y; Heinemann, A W

2014-09-01

A longitudinal retrospective study. To better understand individual-level temporal change in functional status for participants with paraplegia in the National Spinal Cord Injury Database (NSCID), as measured by Rasch Transformed Motor Functional Indepedence Measure (FIM) scores. Multicenter/Multistate longitudinal study across the United States. Non-linear random effects modeling, that is, individual growth curve analysis of retrospective data obtained from the National Institute on Disability and Rehabilitation Research (NIDRR) NSCID. We generated non-linear individual level trajectories of recovery for Rasch Transformed Motor FIM scores that rise rapidly from inpatient rehabilitation admission to a plateau. Trajectories are based on relationships between growth parameters and patient and injury factors: race, gender, level of education at admission, age at injury, neurological level at discharge, American Spinal Injury Association Impairment Scale (AIS) at discharge, days from injury to first system inpatient rehabilitation admission, rehabilitation length of stay, marital status and etiology. On the basis of study results, an interactive tool was developed to represent individual level longitudinal outcomes as trajectories based upon an individual's given baseline characteristics, that is, information supplied by the covariates and provides a robust description of temporal change for those with paraplegia within the NSCID. This methodology allows researchers and clinicians to generate and better understand patient-specific trajectories through the use of an automated interactive tool where a nearly countless number of longitudinal paths of recovery can be explored. Projected trajectories holds promise in facilitating planning for inpatient and outpatient services, which could positively impact long term outcomes.

Longitudinal associations of neighborhood collective efficacy and maternal corporal punishment with behavior problems in early childhood.

PubMed

Ma, Julie; Grogan-Kaylor, Andrew

2017-06-01

Neighborhood and parenting influences on early behavioral outcomes are strongly dependent upon a child's stage of development. However, little research has jointly considered the longitudinal associations of neighborhood and parenting processes with behavior problems in early childhood. To address this limitation, this study explores the associations of neighborhood collective efficacy and maternal corporal punishment with the longitudinal patterns of early externalizing and internalizing behavior problems. The study sample consisted of 3,705 families from a nationally representative cohort study of urban families. Longitudinal multilevel models examined the associations of collective efficacy and corporal punishment with behavior problems at age 3, as well as with patterns of behavior problems between the ages 3 to 5. Interactions between the main predictors and child age tested whether neighborhood and parent relationships with child behavior varied over time. Mediation analysis examined whether neighborhood influences on child behavior were mediated by parenting. The models controlled for a comprehensive set of possible confounders at the child, parent, and neighborhood levels. Results indicate that both maternal corporal punishment and low neighborhood collective efficacy were significantly associated with increased behavior problems. The significant interaction between collective efficacy and child age with internalizing problems suggests that neighborhood influences on internalizing behavior were stronger for younger children. The indirect effect of low collective efficacy on behavior problems through corporal punishment was not significant. These findings highlight the importance of multilevel interventions that promote both neighborhood collective efficacy and nonphysical discipline in early childhood. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

Cohort profile: Wisconsin longitudinal study (WLS).

PubMed

Herd, Pamela; Carr, Deborah; Roan, Carol

2014-02-01

The Wisconsin Longitudinal Study (WLS) is a longitudinal study of men and women who graduated from Wisconsin high schools in 1957 and one of their randomly selected siblings. Wisconsin is located in the upper midwest of the United States and had a population of approximately 14 000 000 in 1957, making it the 14th most populous state at that time. Data spanning almost 60 years allow researchers to link family background, adolescent characteristics, educational experiences, employment experiences, income, wealth, family formation and social and religious engagement to midlife and late-life physical health, mental health, psychological well-being, cognition, end of life planning and mortality. The WLS is one of the few longitudinal data sets that include an administrative measure of cognition from childhood. Further, recently collected saliva samples allow researchers to explore the inter-relationships among genes, behaviours and environment, including genetic determinants of behaviours (e.g. educational attainment); the interactions between genes and environment; and how these interactions predict behaviours. Most panel members were born in 1939, and the sample is broadly representative of White, non-Hispanic American men and women who have completed at least a high school education. Siblings cover several adjoining cohorts: they were born primarily between 1930 and 1948. At each interview, about two-thirds of the sample lived in Wisconsin, and about one-third lived elsewhere in the United States or abroad. The data, along with documentation, are publicly accessible and can be accessed at http://www.ssc.wisc.edu/wlsresearch/. Requests for protected data or assistance should be sent to wls@ssc.wisc.edu.

Investigation of individual and group variability in estrous cycle characteristics in female Asian elephants (Elephas maximus) at the Oregon Zoo.

PubMed

Glaeser, S S; Hunt, K E; Martin, M S; Finnegan, M; Brown, J L

2012-07-15

Evaluating ovarian cycle activity through longitudinal progestagen monitoring is important for optimizing breeding management of captive elephants and understanding impact of life events (births, deaths, and transfers) on reproductive function. This study summarized serum progestagen profiles for eight Asian mainland elephants (Elephas maximus indicus) and one Bornean elephant (E. maximus borneensis) at the Oregon Zoo over a 20-yr interval, and represents the longest longitudinal dataset evaluated to date. Estrous cycle characteristics were more varied than previously reported for this species, with an overall duration of 12 to 19 wk, luteal phase duration of 4 to 15 wk, and follicular phase duration of 2 to 12 wk. In general, there was more cycle variability across than within individual elephants. Compared with other elephants in the group, the Borneo female exhibited consistently longer cycle lengths, higher progestagen concentrations, and greater cycle variability; however, it is not known if this represents a subspecies or an individual difference. Cycle durations did not appear to change over time or with age, and the first pubertal cycle was similar to subsequent cycles. Variability in duration of the follicular phase was greater than that of the luteal phase. In addition, there was a significant negative relationship between luteal and follicular phase durations, suggesting a possible regulatory role of the follicular phase in maintaining a relatively consistent cycle duration within individuals. Overall, we found these elephants to be highly resilient in that major life events (births, deaths, and changes in herd structure) had minimal effect on cycle dynamics over time. In conclusion, the higher range in cycle phase characteristics is likely because of the larger number of elephants studied and longer duration of longitudinal monitoring, and may be more representative of the captive population as a whole. Furthermore, identification of significant interanimal variability suggests that understanding the complexities of herd reproductive characteristics could facilitate development of more effective institution-specific breeding management strategies. Copyright © 2012 Elsevier Inc. All rights reserved.

Projecting Sexual and Injecting HIV Risks into Future Outcomes with Agent-Based Modeling

NASA Astrophysics Data System (ADS)

Bobashev, Georgiy V.; Morris, Robert J.; Zule, William A.

Longitudinal studies of health outcomes for HIV could be very costly cumbersome and not representative of the risk population. Conversely, cross-sectional approaches could be representative but rely on the retrospective information to estimate prevalence and incidence. We present an Agent-based Modeling (ABM) approach where we use behavioral data from a cross-sectional representative study and project the behavior into the future so that the risks of acquiring HIV could be studied in a dynamical/temporal sense. We show how the blend of behavior and contact network factors (sexual, injecting) play the role in the risk of future HIV acquisition and time till obtaining HIV. We show which subjects are the most likely persons to get HIV in the next year, and whom they are likely to infect. We examine how different behaviors are related to the increase or decrease of HIV risks and how to estimate the quantifiable risk measures such as survival HIV free.

Exposing the Backstage: Critical Reflections on a Longitudinal Qualitative Study of Residents’ Care Networks in Assisted Living

PubMed Central

Kemp, Candace L.; Ball, Mary M.; Morgan, Jennifer Craft; Doyle, Patrick J.; Burgess, Elisabeth O.; Dillard, Joy A.; Barmon, Christina E.; Fitzroy, Andrea F.; Helmly, Victoria E.; Avent, Elizabeth S.; Perkins, Molly M.

2018-01-01

In this article, we analyze the research experiences associated with a longitudinal qualitative study of residents’ care networks in assisted living. Using data from researcher meetings, field notes, and memos, we critically examine our design and decision making and accompanying methodological implications. We focus on one complete wave of data collection involving 28 residents and 114 care network members in four diverse settings followed for 2 years. We identify study features that make our research innovative, but that also represent significant challenges. They include the focus and topic; settings and participants; scope and design complexity; nature, modes, frequency, and duration of data collection; and analytic approach. Each feature has methodological implications, including benefits and challenges pertaining to recruitment, retention, data collection, quality, and management, research team work, researcher roles, ethics, and dissemination. Our analysis demonstrates the value of our approach and of reflecting on and sharing methodological processes for cumulative knowledge building. PMID:27651072

Social support at work and leisure time and its association with self-rated health and sickness absence.

PubMed

Falkenberg, A; Nyfjäll, M; Hellgren, C; Vingård, E

2012-01-01

The aim of this longitudinal study is to investigate how different aspects of social support at work and in leisure time are associated with self rated health and sickness absence. The 541 participants in the study were representative for a working population in the public sector in Sweden with a majority being woman. Most of the variables were created from data from a questionnaire in March-April 2005. There were four independent variables and two dependent variables. The dependent were based on data from November 2006. A logistic regression model was used for the analysis of associations. A separate model was adapted for each of the explanatory variables for each outcome, which gave five models per independent variable. The study has given a greater awareness of the importance of employees receiving social support, regardless of type of support or from whom the support is coming. Social support has a strong association with SRH in a longitudinal perspective and no association between social support and sickness absence.

Achievement, motivation, and educational choices: A longitudinal study of expectancy and value using a multiplicative perspective.

PubMed

Guo, Jiesi; Parker, Philip D; Marsh, Herbert W; Morin, Alexandre J S

2015-08-01

Drawing on the expectancy-value model, the present study explored individual and gender differences in university entry and selection of educational pathway (e.g., science, technology, engineering, and mathematics [STEM] course selection). In particular, we examined the multiplicative effects of expectancy and task values on educational outcomes during the transition into early adulthood. Participants were from a nationally representative longitudinal sample of 15-year-old Australian youths (N = 10,370). The results suggest that (a) both math self-concept and intrinsic value interact in predicting advanced math course selection, matriculation results, entrance into university, and STEM fields of study; (b) prior reading achievement has negative effects on advanced math course selection and STEM fields through math motivational beliefs; and (c) gender differences in educational outcomes are mediated by gender differences in motivational beliefs and prior academic achievement, while the processes underlying choice of educational pathway were similar for males and females. (c) 2015 APA, all rights reserved).

Exposing the Backstage: Critical Reflections on a Longitudinal Qualitative Study of Residents' Care Networks in Assisted Living.

PubMed

Kemp, Candace L; Ball, Mary M; Morgan, Jennifer Craft; Doyle, Patrick J; Burgess, Elisabeth O; Dillard, Joy A; Barmon, Christina E; Fitzroy, Andrea F; Helmly, Victoria E; Avent, Elizabeth S; Perkins, Molly M

2017-07-01

In this article, we analyze the research experiences associated with a longitudinal qualitative study of residents' care networks in assisted living. Using data from researcher meetings, field notes, and memos, we critically examine our design and decision making and accompanying methodological implications. We focus on one complete wave of data collection involving 28 residents and 114 care network members in four diverse settings followed for 2 years. We identify study features that make our research innovative, but that also represent significant challenges. They include the focus and topic; settings and participants; scope and design complexity; nature, modes, frequency, and duration of data collection; and analytic approach. Each feature has methodological implications, including benefits and challenges pertaining to recruitment, retention, data collection, quality, and management, research team work, researcher roles, ethics, and dissemination. Our analysis demonstrates the value of our approach and of reflecting on and sharing methodological processes for cumulative knowledge building.

Beverage displacement between elementary and middle school, 2004-2007.

PubMed

Oza-Frank, Reena; Zavodny, Madeline; Cunningham, Solveig A

2012-09-01

Sweetened beverages of low nutritional quality might be displacing more nutritious beverages, such as 100% fruit juice and milk, from children's diets. However, previous research has not examined changes in beverage intake over time using nationally representative longitudinal data. Our objective was to examine changes in sweetened beverage, milk, and juice consumption between 5th and 8th grade. We used a longitudinal analysis of self-reported beverage consumption. Data were from the Early Childhood Longitudinal Survey-Kindergarten Cohort 1998-1999 (ECLS-K), a nationally representative study of children followed from kindergarten through 8th grade. This analysis used data from Spring 2004 and 2007, when most children were in 5th and 8th grade, respectively (n=7,445). Main outcome measures were changes in consumption of sweetened beverages, milk, and 100% fruit juice last week. Survey-adjusted linear regression was used to estimate longitudinal relationships between servings of milk, sweetened beverages, and 100% fruit juice, controlling for child and family characteristics and food consumption. Children's milk consumption decreased between 5th and 8th grade, and these decreases were larger among children who drank sweetened beverages daily. However, after controlling for demographic characteristics, changes in children's milk consumption were not significantly related to changes in their consumption of sweetened beverages over time (β=.005; P=0.81), while changes in milk consumption were positively related to changes in juice consumption (β=.087; P<0.01). Observed decreases in average milk consumption from 5th to 8th grade were not related to changes in sweetened-beverage consumption. They were positively related to changes in fruit juice consumption, so not indicating displacement. Caloric beverages generally tended to increase or decrease in tandem, so focus must be placed on their role in children's entire diet and on balancing them with food and total beverage intake. Copyright © 2012 Academy of Nutrition and Dietetics. Published by Elsevier Inc. All rights reserved.

Social Modulation or Hormonal Causation? Linkages of Testosterone with Sexual Activity and Relationship Quality in a Nationally Representative Longitudinal Sample of Older Adults.

PubMed

Das, Aniruddha; Sawin, Nicole

2016-11-01

This study used population-representative longitudinal data from the 2005-2006 and 2010-2011 waves of the National Social Life, Health and Aging Project-a probability sample of US adults aged 57-85 at baseline (N = 650 women and 620 men)-to examine the causal direction in linkages of endogenous testosterone (T) with sexual activity and relationship quality. For both genders, our autoregressive effects indicated a large amount of temporal stability, not just in individual-level attributes (T, masturbation) but also dyadic ones (partnered sex, relationship quality)-indicating that a need for more nuanced theories of relational processes. Cross-lagged results suggested gender-specific effects-generally more consistent with sexual or relational modulation of T than with hormonal causation. Specifically, men's findings indicated their T might be elevated by their sexual (masturbatory) activity but not vice versa, although androgen levels did lower men's subsequent relationship quality. Women's T, in contrast, was negatively influenced not just by their higher relationship quality but also by their more frequent partnered sex-perhaps reflecting a changing function of sexual activity in late life.

Assessing the first wave of epidemiological studies of nanomaterial workers

NASA Astrophysics Data System (ADS)

Liou, Saou-Hsing; Tsai, Candace S. J.; Pelclova, Daniela; Schubauer-Berigan, Mary K.; Schulte, Paul A.

2015-10-01

The results of early animal studies of engineered nanomaterials (ENMs) and air pollution epidemiology suggest that it is important to assess the health of ENM workers. Initial epidemiological studies of workers' exposure to ENMs (<100 nm) are reviewed and characterized for their study designs, findings, and limitations. Of the 15 studies, 11 were cross-sectional, 4 were longitudinal (1 was both cross-sectional and longitudinal in design), and 1 was a descriptive pilot study. Generally, the studies used biologic markers as the dependent variables. All 11 cross-sectional studies showed a positive relationship between various biomarkers and ENM exposures. Three of the four longitudinal studies showed a negative relationship; the fourth showed positive findings after a 1-year follow-up. Each study considered exposure to ENMs as the independent variable. Exposure was assessed by mass concentration in 10 studies and by particle count in six studies. Six of them assessed both mass and particle concentrations. Some of the studies had limited exposure data because of inadequate exposure assessment. Generally, exposure levels were not very high in comparison to those in human inhalation chamber studies, but there were some exceptions. Most studies involved a small sample size, from 2 to 258 exposed workers. These studies represent the first wave of epidemiological studies of ENM workers. They are limited by small numbers of participants, inconsistent (and in some cases inadequate) exposure assessments, generally low exposures, and short intervals between exposure and effect. Still, these studies are a foundation for future work; they provide insight into where ENM workers are experiencing potentially adverse effects that might be related to ENM exposures.

Transition planning for youth with traumatic brain injury: findings from the National Longitudinal Transition Survey-2.

PubMed

Wehman, Paul; Chen, Chin-Chih; West, Michael; Cifu, Gabriella

2014-01-01

Despite of a growing body of research on vocational and educational difficulties for students with traumatic brain injury (TBI), only limited empirical studies specifically examined how school transition services facilitate later employment outcomes. This exploratory, prospective longitudinal study examined the prevalence of employment and characteristics of transition planning practices that promoted positive school-to-work transition for students with TBI. The participants (n = 200) was drawn from the National Longitudinal Transition Study-2 (NLTS-2), a ten-year study which followed a large nationally representative sample of youth with disabilities through secondary education in into young adulthood. Logistic regression was used to investigate the associations between student, school, and collaborative engagement in the planning process and employment outcomes up to 8 years after high school. Among youth with TBI, 51% held current employment at the time of interview and 73% had been employed at any time after high school. Findings showed that students with TBI who had transition goals for postsecondary education were more likely to be employed at some point since leaving high school. The findings also support active student engagement and leadership in the transition planning process, and the inclusion of outside organizations and individuals. Findings indicate the impact of student, school and adult service agency engagement in transition planning processes. Implications for educational practices and future research are discussed.

Cohort Profile: Footprints in Time, the Australian Longitudinal Study of Indigenous Children.

PubMed

Thurber, Katherine A; Banks, Emily; Banwell, Cathy

2015-06-01

Indigenous Australians experience profound levels of disadvantage in health, living standards, life expectancy, education and employment, particularly in comparison with non-Indigenous Australians. Very little information is available about the healthy development of Australian Indigenous children; the Longitudinal Study of Indigenous Children (LSIC) is designed to fill this knowledge gap.This dataset provides an opportunity to follow the development of up to 1759 Indigenous children. LSIC conducts annual face-to-face interviews with children (aged 0.5-2 and 3.5-5 years at baseline in 2008) and their caregivers. This represents between 5% and 10% of the total population of Indigenous children in these age groups, including families of varied socioeconomic and cultural backgrounds. Study topics include: the physical, social and emotional well-being of children and their caregivers; language; culture; parenting; and early childhood education.LSIC is a shared resource, formed in partnership with communities; its data are readily accessible through the Australian Government Department of Social Services (see http://dss.gov.au/lsic for data and access arrangements). As one of very few longitudinal studies of Indigenous children, and the only national one, LSIC will enable an understanding of Indigenous children from a wide range of environments and cultures. Findings from LSIC form part of a growing infrastructure from which to understand Indigenous child health. © The Author 2014. Published by Oxford University Press on behalf of the International Epidemiological Association.

Cohort Profile: Footprints in Time, the Australian Longitudinal Study of Indigenous Children

PubMed Central

Thurber, Katherine A; Banks, Emily; Banwell, Cathy

2015-01-01

Indigenous Australians experience profound levels of disadvantage in health, living standards, life expectancy, education and employment, particularly in comparison with non-Indigenous Australians. Very little information is available about the healthy development of Australian Indigenous children; the Longitudinal Study of Indigenous Children (LSIC) is designed to fill this knowledge gap. This dataset provides an opportunity to follow the development of up to 1759 Indigenous children. LSIC conducts annual face-to-face interviews with children (aged 0.5–2 and 3.5–5 years at baseline in 2008) and their caregivers. This represents between 5% and 10% of the total population of Indigenous children in these age groups, including families of varied socioeconomic and cultural backgrounds. Study topics include: the physical, social and emotional well-being of children and their caregivers; language; culture; parenting; and early childhood education. LSIC is a shared resource, formed in partnership with communities; its data are readily accessible through the Australian Government Department of Social Services (see http://dss.gov.au/lsic for data and access arrangements). As one of very few longitudinal studies of Indigenous children, and the only national one, LSIC will enable an understanding of Indigenous children from a wide range of environments and cultures. Findings from LSIC form part of a growing infrastructure from which to understand Indigenous child health. PMID:25011454

A National Look at the High School Counseling Office: What Is It Doing and What Role Can It Play in Facilitating Students' Paths to College?

ERIC Educational Resources Information Center

Radford, Alexandria Walton; Ifill, Nicole; Lew, Terry

2016-01-01

Between January and October of 2013, nearly 3 million Americans between the ages of 16 and 24 graduated from high school. By October of that year, just two-thirds had enrolled in college. This report uses recently released nationally representative High School Longitudinal Study of 2009 (HSLS:09) data from Spring 2012 to examine American high…

Early detection of cardiac involvement in sarcoidosis with 2-dimensional speckle-tracking echocardiography.

PubMed

Schouver, Elie-Dan; Moceri, Pamela; Doyen, Denis; Tieulie, Nathalie; Queyrel, Viviane; Baudouy, Delphine; Cerboni, Pierre; Gibelin, Pierre; Leroy, Sylvie; Fuzibet, Jean-Gabriel; Ferrari, Emile

2017-01-15

Cardiac sarcoidosis (CS) is associated with high morbidity and sudden death. The absence of specific symptoms and lack of diagnostic gold standard technique is challenging. New imaging methods could improve the diagnosis of CS. The aim of our study was to assess the role of left ventricular (LV) longitudinal and circumferential strain as estimated by 2D speckle-tracking imaging in patients with diagnosed sarcoidosis without cardiac involvement according to the current guidelines. We investigated the prevalence of LV strain impairment in this population and assessed its relationship with clinical outcomes, composite of mortality, heart failure, arrhythmia and/or secondarily development of CS and cardiac device implantation. We performed a prospective case-control longitudinal study including 35 patients with diagnosed sarcoidosis and normal cardiac function as assessed by standard transthoracic echocardiography and 35 healthy age- and gender-matched controls. All patients underwent a comprehensive echocardiographic study. Mean age of patients was 47.9±14.8years old (22 women). Compared with controls, global LV longitudinal strain (LV GLS) was reduced in sarcoidosis patients: (-17.2±3.1 vs -21.3±1.5%, p<0.0001). Circumferential LV strain was preserved in patients compared to controls (-19.9±-4.3% vs -21.3±1.5%, p=0.12). Impaired LV GLS was significantly associated with clinical outcomes (HR 1.56; [1.16-2.11], p<0.01) on univariate analysis. Speckle-tracking echocardiography revealed decreased longitudinal LV strain in sarcoidosis patients that was associated with outcomes. LV GLS may represent an early marker of myocardial involvement in sarcoidosis patients that needs to be studied further. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

Post and during event effect of cell phone talking and texting on driving performance--a driving simulator study.

PubMed

Thapa, Raju; Codjoe, Julius; Ishak, Sherif; McCarter, Kevin S

2015-01-01

A number of studies have been done in the field of driver distraction, specifically on the use of cell phone for either conversation or texting while driving. Researchers have focused on the driving performance of drivers when they were actually engaged in the task; that is, during the texting or phone conversation event. However, it is still unknown whether the impact of cell phone usages ceases immediately after the end of task. The primary objective of this article is to analyze the post-event effect of cell phone usage (texting and conversation) in order to verify whether the distracting effect lingers after the actual event has ceased. This study utilizes a driving simulator study of 36 participants to test whether a significant decrease in driver performance occurs during cell phone usage and after usage. Surrogate measures used to represent lateral and longitudinal control of the vehicle were standard deviation (SD) of lane position and mean velocity, respectively. RESULTS suggest that there was no significant decrease in driver performance (both lateral and longitudinal control) during and after the cell phone conversation. For the texting event, there were significant decreases in driver performance in both the longitudinal and lateral control of the vehicle during the actual texting task. The diminished longitudinal control ceased immediately after the texting event but the diminished lateral control lingered for an average of 3.38 s. The number of text messages exchanged did not affect the magnitude or duration of the diminished lateral control. The result indicates that the distraction and subsequent elevated crash risk of texting while driving linger even after the texting event has ceased. This finding has safety and policy implications in reducing distracted driving.

Persistent work-life conflict and health satisfaction - A representative longitudinal study in Switzerland

PubMed Central

2011-01-01

Background The objectives of the present study were (1) to track work-life conflict in Switzerland during the years 2002 to 2008 and (2) to analyse the relationship between work-life conflict and health satisfaction, examining whether long-term work-life conflict leads to poor health satisfaction. Methods The study is based on a representative longitudinal database (Swiss Household Panel), covering a six-year period containing seven waves of data collection. The sample includes 1261 persons, with 636 men and 625 women. Data was analysed by multi-level mixed models and analysis of variance with repeated measures. Results In the overall sample, there was no linear increase or decrease of work-life conflict detected, in either its time-based or strain-based form. People with higher education were more often found to have a strong work-life conflict (time- and strain-based), and more men demonstrated a strong time-based work-life conflict than women (12.2% vs. 5%). A negative relationship between work-life conflict and health satisfaction over time was found. People reporting strong work-life conflict at every wave reported lower health satisfaction than people with consistently weak work-life conflict. However, the health satisfaction of those with a continuously strong work-life conflict did not decrease during the study period. Conclusions Both time-based and strain-based work-life conflict are strongly correlated to health satisfaction. However, no evidence was found for a persistent work-life conflict leading to poor health satisfaction. PMID:21529345

Persistent work-life conflict and health satisfaction - a representative longitudinal study in Switzerland.

PubMed

Knecht, Michaela K; Bauer, Georg F; Gutzwiller, Felix; Hämmig, Oliver

2011-04-29

The objectives of the present study were (1) to track work-life conflict in Switzerland during the years 2002 to 2008 and (2) to analyse the relationship between work-life conflict and health satisfaction, examining whether long-term work-life conflict leads to poor health satisfaction. The study is based on a representative longitudinal database (Swiss Household Panel), covering a six-year period containing seven waves of data collection. The sample includes 1261 persons, with 636 men and 625 women. Data was analysed by multi-level mixed models and analysis of variance with repeated measures. In the overall sample, there was no linear increase or decrease of work-life conflict detected, in either its time-based or strain-based form. People with higher education were more often found to have a strong work-life conflict (time- and strain-based), and more men demonstrated a strong time-based work-life conflict than women (12.2% vs. 5%). A negative relationship between work-life conflict and health satisfaction over time was found. People reporting strong work-life conflict at every wave reported lower health satisfaction than people with consistently weak work-life conflict. However, the health satisfaction of those with a continuously strong work-life conflict did not decrease during the study period. Both time-based and strain-based work-life conflict are strongly correlated to health satisfaction. However, no evidence was found for a persistent work-life conflict leading to poor health satisfaction.

The epidemiology and burden of Alzheimer’s disease in Taiwan utilizing data from the National Health Insurance Research Database

PubMed Central

Hung, Yen-Ni; Kadziola, Zbigniew; Brnabic, Alan JM; Yeh, Ju-Fen; Fuh, Jong-Ling; Hwang, Jen-Ping; Montgomery, William

2016-01-01

Purpose The objectives of this study were to estimate the incidence, cumulative incidence, and economic burden of Alzheimer’s disease (AD) in Taiwan, using data from the National Health Insurance Research Database (NHIRD). Materials and methods This was a retrospective, longitudinal, observational study using data from the Longitudinal Health Insurance Database of the NHIRD. Patients were included in this study if they were 50 years of age or older and their records included a primary or secondary diagnosis of AD. New patients who met inclusion criteria were followed up longitudinally from 2005 to 2010. Costs were calculated for the first year following the diagnosis of AD. Results Overall, a higher percentage of women than men were diagnosed with AD (54% vs 46%, respectively). The first AD diagnosis occurred most frequently in the age of 75–84 years. The person-year incidence rate increased from 5.63/1,000 persons (95% CI, 5.32–5.94) in 2005 to 8.17/1,000 persons (95% CI, 7.78–8.57) in 2010. The cumulative incidence rate was 33.54/1,000 persons (95% CI, 32.76–34.33) in 2005–2010. The total mean inflated annual costs per patient in new Taiwan dollars (NT$) in the first year of diagnosis ranged from NT$205,413 (2009) to NT$227,110 (2005), with hospitalization representing the largest component. Conclusion AD represents a substantial burden in Taiwan, and based on the observed increase in incidence rate over time, it is likely that this burden will continue to increase. The findings reported here are consistent with previous research. The NHIRD contains extensive real-world information that can be used to conduct research, allowing us to expand our understanding of the incidence, prevalence, and burden of disease in Taiwan. PMID:27536149

Cynical beliefs about human nature and income: Longitudinal and cross-cultural analyses.

PubMed

Stavrova, Olga; Ehlebracht, Daniel

2016-01-01

Based on the existing literature on worldview beliefs, cynical hostility, and Machiavellian cynicism, we suggest that holding cynical beliefs about human nature can be detrimental for individuals' income. Cynical individuals are more likely to avoid cooperation and trust or to overinvest in monitoring, control, and other means of protection from potential exploitation. As a result, they are more likely to forgo valuable opportunities for cooperation and consequently less likely to reap the benefits of joint efforts and mutual help compared with their less cynical counterparts. Studies 1 and 2, using nationally representative longitudinal surveys of the American population, show that individuals who endorsed cynical beliefs about human nature at baseline earned comparatively lower incomes 9 (Study 1) and 2 (Study 2) years later. In Study 3, applying a multilevel model of change to a nationally representative panel study of the German population, we show that cynical beliefs at baseline undermined an income increase in the course of the following 9 years. In Study 4, the negative effect of cynical beliefs on income proved to be independent of individual differences in the Big Five personality dimensions. Study 5 provided the first tentative evidence of the hypothesized mechanism underlying this effect. Using survey data from 41 countries, it revealed that the negative effect of cynical beliefs on income is alleviated in sociocultural contexts with low levels of prosocial behavior, high homicide rates and high overall societal cynicism levels. Holding cynical beliefs about others has negative economic outcomes unless such beliefs hold true. (c) 2016 APA, all rights reserved).

Longitudinal links between spanking and children's externalizing behaviors in a national sample of White, Black, Hispanic, and Asian American families.

PubMed

Gershoff, Elizabeth T; Lansford, Jennifer E; Sexton, Holly R; Davis-Kean, Pamela; Sameroff, Arnold J

2012-01-01

This study examined whether the longitudinal links between mothers' use of spanking and children's externalizing behaviors are moderated by family race/ethnicity, as would be predicted by cultural normativeness theory, once mean differences in frequency of use are controlled. A nationally representative sample of White, Black, Hispanic, and Asian American families (n = 11,044) was used to test a cross-lagged path model from 5 to 8 years old. While race/ethnic differences were observed in the frequency of spanking, no differences were found in the associations of spanking and externalizing over time: Early spanking predicted increases in children's externalizing while early child externalizing elicited more spanking over time across all race/ethnic groups. © 2011 The Authors. Child Development © 2011 Society for Research in Child Development, Inc.

Emotionally numb: Desensitization to community violence exposure among urban youth.

PubMed

Kennedy, Traci M; Ceballo, Rosario

2016-05-01

Community violence exposure (CVE) is associated with numerous psychosocial outcomes among youth. Although linear, cumulative effects models have typically been used to describe these relations, emerging evidence suggests the presence of curvilinear associations that may represent a pattern of emotional desensitization among youth exposed to chronic community violence. This study uses longitudinal data to investigate relations between CVE and both internalizing and externalizing symptoms among 3,480 youth ages 3 to 12 at baseline and 9 to 18 at outcome. Results support desensitization models, as evidenced by longitudinal quadratic associations between Wave 2 CVE and Wave 3 anxiety/depressive symptoms, alongside cross-sectional linear associations between Wave 3 CVE and Wave 3 aggression. Neither age nor gender moderated the associations between CVE and well-being. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

Does Seeking e-Cigarette Information Lead to Vaping? Evidence from a National Longitudinal Survey of Youth and Young Adults.

PubMed

Yang, Qinghua; Liu, Jiaying; Lochbuehler, Kirsten; Hornik, Robert

2017-12-13

Youth and young adults (YYAs) are vulnerable populations for e-cigarette use or vaping. This study examined the effect of YYAs' health information seeking behavior (HISB) around e-cigarette use and vaping on their subsequent vaping behavior. We conducted a nationally representative longitudinal phone survey of 13-25 year olds from June 2014 to September 2016, with 2,413 respondents who completed a baseline and follow-up survey six months later. The results from lagged logistic regressions and mediation analyses showed a) that information seeking predicted higher likelihood of vaping six months later even after controlling for baseline smoking and vaping status, intention to vape, and demographics, and b) that information seeking partially mediated the relationship between intention to vape and subsequent vaping behavior. Theoretical and regulatory implications are discussed.

Static Aeroelastic and Longitudinal Trim Model of Flexible Wing Aircraft Using Finite-Element Vortex-Lattice Coupled Solution

NASA Technical Reports Server (NTRS)

Ting, Eric; Nguyen, Nhan; Trinh, Khanh

2014-01-01

This paper presents a static aeroelastic model and longitudinal trim model for the analysis of a flexible wing transport aircraft. The static aeroelastic model is built using a structural model based on finite-element modeling and coupled to an aerodynamic model that uses vortex-lattice solution. An automatic geometry generation tool is used to close the loop between the structural and aerodynamic models. The aeroelastic model is extended for the development of a three degree-of-freedom longitudinal trim model for an aircraft with flexible wings. The resulting flexible aircraft longitudinal trim model is used to simultaneously compute the static aeroelastic shape for the aircraft model and the longitudinal state inputs to maintain an aircraft trim state. The framework is applied to an aircraft model based on the NASA Generic Transport Model (GTM) with wing structures allowed to flexibly deformed referred to as the Elastically Shaped Aircraft Concept (ESAC). The ESAC wing mass and stiffness properties are based on a baseline "stiff" values representative of current generation transport aircraft.

Estimation of incidence and recovery rates of Plasmodium falciparum parasitaemia from longitudinal data

PubMed Central

Bekessy, A.; Molineaux, L.; Storey, J.

1976-01-01

A method is described of estimating the malaria incidence rate ĥ and the recovery rate r from longitudinal data. The method is based on the assumption that the phenomenon of patent parasitaemia can be represented by a reversible two-state catalytic model; it is applicable to all problems that can be represented by such a model. The method was applied to data on falciparum malaria from the West African savanna and the findings suggested that immunity increases the rate of recovery from patent parasitaemia by a factor of up to 10, and also reduces the number of episodes of patent parasitaemia resulting from one inoculation. Under the effect of propoxur, ĥ varies with the estimated man-biting rate of the vector while r̂ increases, possibly owing to reduced super-infection. PMID:800968

Hydrodynamic role of longitudinal ridges in a leatherback turtle swimming

NASA Astrophysics Data System (ADS)

Bang, Kyeongtae; Kim, Jooha; Lee, Sang-Im; Choi, Haecheon

2015-11-01

The leatherback sea turtle (Dermochelys coriacea), the fastest swimmer and the deepest diver among marine turtles, has five longitudinal ridges on its carapace. These ridges are the most remarkable morphological features distinguished from other marine turtles. To investigate the hydrodynamic role of these ridges in the leatherback turtle swimming, we model a carapace with and without ridges by using three dimensional surface data of a stuffed leatherback turtle in the National Science Museum, Korea. The experiment is conducted in a wind tunnel in the ranges of the real leatherback turtle's Reynolds number (Re) and angle of attack (α). The longitudinal ridges function differently according to the flow condition (i.e. Re and α). At low Re and negative α that represent the swimming condition of hatchlings and juveniles, the ridges significantly decrease the drag by generating streamwise vortices and delaying the main separation. On the other hand, at high Re and positive α that represent the swimming condition of adults, the ridges suppress the laminar separation bubble near the front part by generating streamwise vortices and enhance the lift and lift-to-drag ratio. Supported by the NRF program (2011-0028032).

Identity Formation in Adulthood: A Longitudinal Study from Age 27 to 50

PubMed Central

Fadjukoff, Päivi; Pulkkinen, Lea; Kokko, Katja

2016-01-01

ABSTRACT Longitudinal patterns of identity formation were analyzed in a representative cohort group of Finnish men and women born in 1959 across ages 27, 36, 42, and 50. The data were drawn from the Jyväskylä Longitudinal Study of Personality. Identity status (diffused, moratorium, foreclosed, achieved) from all four ages was available for 172 participants (54% females). Marcia’s Identity Status Interview used in this research included five domains: religious beliefs, political identity, occupational career, intimate relationships, and lifestyle. The findings indicated great variability in identity status across domains at each age level, and the identity trajectories fluctuated from age 27 to 50. The developmental trend from age 27 to 50 was moderately progressive (toward achievement) for the five domains and for overall identity, with the exception of a slightly regressive trend in male religious identity. Remaining stable in the same status category across the four measurements was rare and emerged only for diffusion in the ideological domains. Women generally outnumbered men in identity achievement at earlier ages, but the gender differences diminished in most domains at age 50, except in religious identity. In women overall diffusion decreased over time, but in men it remained at about 20% at ages 42 and 50. PMID:27019650

Hierarchy of higher-level physical functions: a longitudinal investigation on a nationally representative population of community-dwelling middle-aged and elderly persons.

PubMed

Yeh, Chih-Jung; Wang, Ching-Yi; Tang, Pei-Fang; Lee, Meng-Chih; Lin, Hui-Sheng; Chen, Hui-Ya

2012-01-01

Understanding the hierarchy of higher-level physical functions to infer disability level (mild, moderate or severe) is essential for the precise targeting of preventive interventions and has been examined previously in a cross-sectional study. Based on longitudinal data, this study evaluated the hierarchy of higher-level physical functions. Data from a cohort of 2729 community-dwelling persons aged over 50 with no initial disability were drawn from the "Survey of Health and Living Status of the Elderly in Taiwan" from 1996 through 2007. The three-level hierarchy of eight chosen activities was examined by the median ages to disability onset with survival analyses and by Cox regressions, which examined the effects of sex and age on the development of this hierarchy. The progression of incident disability was as follows: mild level-running, carrying weight, and squatting; moderate level-climbing stairs, walking, and standing; and severe level-grasping and raising arms up. Women and older persons were at greater risk of developing more severe levels of disability. Another Cox regression with one index activity from each hierarchical level revealed similar results. The three-level hierarchy of higher-level physical functions has been validated longitudinally, suggesting rich research and clinical implications.

Sports participation and parent-reported health-related quality of life in children: longitudinal associations.

PubMed

Vella, Stewart A; Cliff, Dylan P; Magee, Christopher A; Okely, Anthony D

2014-06-01

To investigate the longitudinal association between sports participation and parent-reported health-related quality of life (HRQOL) in children. Cohort study that used data drawn from the Longitudinal Study of Australian Children in waves 3 (2008) and 4 (2010). Participants were a nationally representative sample of 4042 Australian children ages 8.25 (SD = 0.44) years at baseline and followed-up 24 months later. After we adjusted for multiple covariates, children who continued to participate in sports between the ages of 8 and 10 years had greater parent-reported HRQOL at age 10 (Eta2 = .02) compared with children who did not participate in sports (P ≤ .001), children who commenced participation after 8 years of age (P = .004), and children who dropped out of sports before reaching 10 years of age (P = .04). Children who participated in both team and individual sports (P = .02) or team sports alone (P = .04) had greater HRQOL compared with children who participated in individual sports alone (Eta2 = .01). The benefits of sports participation were strongest for girls (P < .05; Eta2 = .003). Children's participation in developmentally appropriate team sports helps to protect HRQOL and should be encouraged at an early age and maintained for as long as possible. Copyright © 2014 Elsevier Inc. All rights reserved.

Alternative Approaches to Assessing Nonresponse Bias in Longitudinal Survey Estimates: An Application to Substance-Use Outcomes Among Young Adults in the United States

PubMed Central

West, Brady Thomas; McCabe, Sean Esteban

2017-01-01

Abstract We evaluated alternative approaches to assessing and correcting for nonresponse bias in a longitudinal survey. We considered the changes in substance-use outcomes over a 3-year period among young adults aged 18–24 years (n = 5,199) in the United States, analyzing data from the National Epidemiologic Survey on Alcohol and Related Conditions. This survey collected a variety of substance-use information from a nationally representative sample of US adults in 2 waves: 2001–2002 and 2004–2005. We first considered nonresponse rates in the second wave as a function of key substance-use outcomes in wave 1. We then evaluated 5 alternative approaches designed to correct for nonresponse bias under different attrition mechanisms, including weighting adjustments, multiple imputation, selection models, and pattern-mixture models. Nonignorable attrition in a longitudinal survey can lead to bias in estimates of change in certain health behaviors over time, and only selected procedures enable analysts to assess the sensitivity of their inferences to different assumptions about the extent of nonignorability. We compared estimates based on these 5 approaches, and we suggest a road map for assessing the risk of nonresponse bias in longitudinal studies. We conclude with directions for future research in this area given the results of our evaluations. PMID:28338839

Understanding women who self-harm: Predictors and long-term outcomes in a longitudinal community sample.

PubMed

Stanford, Sarah; Jones, Michael P; Loxton, Deborah J

2017-02-01

There is growing awareness of the range of psychosocial, lifestyle, and sociodemographic factors related to self-harm, however this research is often limited by using cross-sectional or convenience samples. And while we generally assume that young adults who self-harm experience poorer long-term outcomes, longitudinal research is needed. This paper builds on prior research using a large, representative, longitudinal sample. 5765 Australian women completed 5 surveys (age 18-23 to 31-36). Six-month self-harm was measured by self-report. We had two aims: firstly to predict future self-harm, separately for women with and without prior self-harm. Secondly, to identify outcomes 3 and 6 years following self-harm. Six-month self-harm prevalence was 2.5%. Predictors among women without recent self-harm included depression, dieting behaviours, number of male sexual partners, and abuse. Among women with recent or current self-harm, predictors were number of dieting behaviours, tiredness of life, and stress. Women who self-harmed reported poorer outcomes, namely greater difficulties in relationships at 3- and 6-year follow-up. Longitudinal risk factors for self-harm differed depending on prior self-harm status, and included depression, dieting behaviours, tiredness of life and stress. These factors may serve as warning signs for new or continued self-harm. This study offers new insight into long-term outcomes up to six years after self-harm, particularly with relationships.

The role of personality in health care use: Results of a population-based longitudinal study in Germany.

PubMed

Hajek, André; Bock, Jens-Oliver; König, Hans-Helmut

2017-01-01

To determine the role of personality in health care use longitudinally. Data were derived from the German Socio-Economic Panel (GSOEP), a nationally representative, longitudinal cohort study of German households starting in 1984. Concentrating on the role of personality, we used data from the years 2005, 2009 and 2013. Personality was measured by using the GSOEP Big Five Inventory (BFI-S). Number of physician visits in the last 3 months and hospital stays in the last year were used as measures of health care use. Adjusting for predisposing factors, enabling resources, and need factors, fixed effects regressions revealed that physician visits increased with increasing neuroticism, whereas extraversion, openness to experience, agreeableness and conscientiousness did not affect physician visits in a significant way. The effect of self-rated health on physician visits was significantly moderated by neuroticism. Moreover, fixed effects regressions revealed that the probability of hospitalization in the past year increased with increasing extraversion, whereas the other personality factors did not affect this outcome measure significantly. Our findings suggest that changes in neuroticism are associated with changes in physician visits and that changes in extraversion are associated with the probability of hospitalization. Since recent studies have shown that treatments can modify personality traits, developing interventional strategies should take into account personality factors. For example, efforts to intervene in changing neuroticism might have beneficial effects for the healthcare system.

Brief Intervention for Truant Youth Sexual Risk Behavior and Alcohol Use: A Parallel Process Growth Model Analysis

PubMed Central

Dembo, Richard; Briones-Robinson, Rhissa; Ungaro, Rocio; Barrett, Kimberly; Gulledge, Laura; Winters, Ken C.; Belenko, Steven; Karas, Lora M.; Wareham, Jennifer

2011-01-01

Truant youths represent a challenging, yet very promising group of at-risk youth to study. In addition to problems in school, they frequently experience troubled family situations, emotional/ psychological problems, involvement in substance use, and delinquency. Given the problems often experienced by truant youth, it is likely they are engaging in alcohol use and sexual risk behavior at a higher rate, than the general youth population. Identification of these youths’ problems and early placement into effective intervention services would benefit them, their families, and society. The current study presents interim findings from an ongoing, NIDA-funded experimental, Brief Intervention (BI) study involving truant youths and their parent/guardians. Baseline, 3-month, 6-month, and 12-month follow up data were analyzed to determine whether alcohol use and sexual risk behaviors were longitudinally related, examine the effects of the intervention on longitudinal alcohol use and sexual risk behaviors, identify latent subgroups of youths in the data for alcohol use and sexual risk behaviors, and determine whether the intervention influenced these subgroups. Results indicated alcohol use and sexual risk were longitudinally related. Subgroups of youth were also identified based on alcohol use and sexual risk behavior levels and trends. Further, limited treatment effects were observed for alcohol use. Implications of the results for future research and service delivery are considered. PMID:25242878

Reassessing the Effects of Early Adolescent Alcohol Use on Later Antisocial Behavior: A Longitudinal Study of Students in Victoria, Australia, and Washington State, United States

ERIC Educational Resources Information Center

Hemphill, Sheryl A.; Heerde, Jessica A.; Scholes-Balog, Kirsty E.; Smith, Rachel; Herrenkohl, Todd I.; Toumbourou, John W.; Catalano, Richard F.

2014-01-01

The effect of early adolescent alcohol use on antisocial behavior was examined at 1- and 2-year follow-up in Washington State, United States, and Victoria, Australia. Each state used the same methods to survey statewide representative samples of students ("N" = 1,858, 52% female) in 2002 (Grade 7 [G7]), 2003 (Grade 8 [G8]), and 2004…

Longitudinal Study of Career Cluster Persistence from 8th Grade to 12th Grade with a Focus on the Science, Technology, Engineering, & Math Career Cluster

NASA Astrophysics Data System (ADS)

Wagner, Judson

Today's technology driven global economy has put pressure on the American education system to produce more students who are prepared for careers in Science, Technology, Engineering, and Math (STEM). Adding to this pressure is the demand for a more diverse workforce that can stimulate the development of new ideas and innovation. This in turn requires more female and under represented minority groups to pursue future careers in STEM. Though STEM careers include many of the highest paid professionals, school systems are dealing with exceptionally high numbers of students, especially female and under represented minorities, who begin but do not persist to STEM degree completion. Using the Expectancy-Value Theory (EVT) framework that attributes student motivation to a combination of intrinsic, utility, and attainment values, this study analyzed readily available survey data to gauge students' career related values. These values were indirectly investigated through a longitudinal approach, spanning five years, on the predictive nature of 8 th grade survey-derived recommendations for students to pursue a future in a particular career cluster. Using logistic regression analysis, it was determined that this 8 th grade data, particularly in STEM, provides significantly high probabilities of a 12th grader's average grade, SAT-Math score, the math and science elective courses they take, and most importantly, interest in the same career cluster.

Social patterning of overeating, binge eating, compensatory behaviours and symptoms of bulimia nervosa in young adult women: results from the Australian Longitudinal Study on Women's Health.

PubMed

Koupil, Ilona; Tooth, Leigh; Heshmati, Amy; Mishra, Gita

2016-12-01

To study social patterning of overeating and symptoms of disordered eating in a general population. A representative, population-based cohort study. The Australian Longitudinal Study on Women's Health (ALSWH), Survey 1 in 1996 and Survey 2 in 2000. Women (n 12 599) aged 18-23 years completed a questionnaire survey at baseline, of whom 6866 could be studied prospectively. Seventeen per cent of women reported episodes of overeating, 16 % reported binge eating and 10 % reported compensatory behaviours. Almost 4 % of women reported symptoms consistent with bulimia nervosa. Low education, not living with family, perceived financial difficulty (OR=1·8 and 1·3 for women with severe and some financial difficulty, respectively, compared with none) and European language other than English spoken at home (OR=1·5 for European compared with Australian/English) were associated with higher prevalence of binge eating. Furthermore, longitudinal analyses indicated increased risk of persistent binge eating among women with a history of being overweight in childhood, those residing in metropolitan Australia, women with higher BMI, smokers and binge drinkers. Overeating, binge eating and symptoms of bulimia nervosa are common among young Australian women and cluster with binge drinking. Perceived financial stress appears to increase the risk of binge eating and bulimia nervosa. It is unclear whether women of European origin and those with a history of childhood overweight carry higher risk of binge eating because of genetic or cultural reasons.

High-resolution study of the 3D collagen fibrillary matrix of Achilles tendons without tissue labelling and dehydrating.

PubMed

Wu, Jian-Ping; Swift, Benjamin John; Becker, Thomas; Squelch, Andrew; Wang, Allan; Zheng, Yong-Chang; Zhao, Xuelin; Xu, Jiake; Xue, Wei; Zheng, Minghao; Lloyd, David; Kirk, Thomas Brett

2017-06-01

Knowledge of the collagen structure of an Achilles tendon is critical to comprehend the physiology, biomechanics, homeostasis and remodelling of the tissue. Despite intensive studies, there are still uncertainties regarding the microstructure. The majority of studies have examined the longitudinally arranged collagen fibrils as they are primarily attributed to the principal tensile strength of the tendon. Few studies have considered the structural integrity of the entire three-dimensional (3D) collagen meshwork, and how the longitudinal collagen fibrils are integrated as a strong unit in a 3D domain to provide the tendons with the essential tensile properties. Using second harmonic generation imaging, a 3D imaging technique was developed and used to study the 3D collagen matrix in the midportion of Achilles tendons without tissue labelling and dehydration. Therefore, the 3D collagen structure is presented in a condition closely representative of the in vivo status. Atomic force microscopy studies have confirmed that second harmonic generation reveals the internal collagen matrix of tendons in 3D at a fibril level. Achilles tendons primarily contain longitudinal collagen fibrils that braid spatially into a dense rope-like collagen meshwork and are encapsulated or wound tightly by the oblique collagen fibrils emanating from the epitenon region. The arrangement of the collagen fibrils provides the longitudinal fibrils with essential structural integrity and endows the tendon with the unique mechanical function for withstanding tensile stresses. A novel 3D microscopic method has been developed to examine the 3D collagen microstructure of tendons without tissue dehydrating and labelling. The study also provides new knowledge about the collagen microstructure in an Achilles tendon, which enables understanding of the function of the tissue. The knowledge may be important for applying surgical and tissue engineering techniques to tendon reconstruction. © 2017 The Authors Journal of Microscopy © 2017 Royal Microscopical Society.

Hearing Impairment and Incident Dementia: Findings from the English Longitudinal Study of Ageing.

PubMed

Davies, Hilary R; Cadar, Dorina; Herbert, Annie; Orrell, Martin; Steptoe, Andrew

2017-09-01

To determine whether hearing loss is associated with incident physician-diagnosed dementia in a representative sample. Retrospective cohort study. English Longitudinal Study of Ageing. Adults aged 50 and older. Cross-sectional associations between self-reported (n = 7,865) and objective hearing measures (n = 6,902) and dementia were examined using multinomial-logistic regression. The longitudinal association between self-reported hearing at Wave 2 (2004/05) and cumulative physician-diagnosed dementia up to Wave 7 (2014/15) was modelled using Cox proportional hazards regression. After adjustment for potential confounders, in cross-sectional analysis, participants who had self-reported or objective moderate and poor hearing were more likely to have a dementia diagnosis than those with normal hearing (self-reported: odds ratio OR = 1.6, 95% CI = 1.1-2.4 moderate hearing; OR = 2.6, 95% CI = 1.7-3.9 poor hearing, objective: OR = 1.6, 95% CI = 1.0-2.8 moderate hearing; OR = 4.4, 95% CI = 1.9-9.9 poor hearing). Longitudinally, the hazard of developing dementia was 1.4 (95% CI = 1.0-1.9) times as high in individuals who reported moderate hearing and 1.6 (95% CI = 1.1-2.0) times as high in those who reported poor hearing. Older adults with hearing loss are at greater risk of dementia than those with normal hearing. These findings are consistent with the rationale that correction of hearing loss could help delay the onset of dementia, or that hearing loss itself could serve as a risk indicator for cognitive decline. © 2017, The Authors. The Journal of the American Geriatrics Society published by Wiley Periodicals, Inc. on behalf of The American Geriatrics Society.

Cross-sectional and longitudinal associations of functional and health status with institutional care use: results from the Survey of Health and Living Status of the Elderly in Taiwan.

PubMed

Tsai, Hsin-Jen

2013-07-01

This study evaluated the cross-sectional and longitudinal associations of functional and health status with institutional care, and examined determinants of institutional care use over time. Data of this study were obtained from the Survey of Health and Living Status of the Elderly in Taiwan (SHLSET), which was launched in 1989 and involved a nationally representative sample of nearly-old and old Taiwanese. The baseline data in this present study were collected in 1999, and followed in 2003 and 2007. Participants with institutional care use had a higher activities of daily living (ADL) score, more self-reported diseases and poorer self-reported health status than participants without institutional care use (all P<0.05). Cross-sectional analysis showed that a higher ADL score, having heart diseases and having a stroke were positively associated with institutional care use (P<0.05); whereas the number of self-reported diseases and poor self-reported health status were not associated with institutional care use. Longitudinal analysis showed that increased ADL scores and the number of self-reported diseases over 4- and 8 years were associated with an increased likelihood of subsequent institutional care use (all P<0.05). Worsening health status over 4 years was associated with an increased likelihood of subsequent institutional care use, but this association did not exist over 8 years. Only ADL and ADL deterioration over time are cross-sectionally and longitudinally associated with increased institutional care use. Declining functional status is a major determinant of institutional care use for Taiwanese aged over 53 years. © 2012 Japan Geriatrics Society.

Behavioral Control and Reward Sensitivity in Adolescents' Risk Taking Behavior: A Longitudinal TRAILS Study.

PubMed

Peeters, Margot; Oldehinkel, Tineke; Vollebergh, Wilma

2017-01-01

Neurodevelopmental theories of risk behavior hypothesize that low behavioral control in combination with high reward sensitivity explains adolescents' risk behavior. However, empirical studies examining this hypothesis while including actual risk taking behavior in adolescence are lacking. In this study we tested whether the imbalance between behavioral control and reward sensitivity underlies risk taking behavior in adolescence, using a nationally representative longitudinal sample of 715 adolescents, of which 66% revealed an increased risk for mental health problems. To assess behavioral control at age 11 we used both self-report (effortful control) as well as behavioral measures of cognitive control (i.e., working memory and response inhibition). Reward sensitivity was assessed with the Bangor Gambling Task. The main finding of this study was that effortful control at age 11 was the best predictor of risk taking behavior (alcohol and cannabis use) at age 16, particularly among adolescents who were more reward sensitive. Risk taking behavior in adolescents might be explained by relatively weak behavioral control functioning combined with high sensitivity for reward.

Directionality of the relationship between social well-being and subjective well-being: evidence from a 20-year longitudinal study.

PubMed

Joshanloo, Mohsen; Sirgy, M Joseph; Park, Joonha

2018-04-30

Self-determination theory suggests that psycho-social well-being prospectively predicts subjective well-being. In contrast, the broaden-and-build theory of positive emotions suggests that subjective well-being has a positive impact on subsequent levels of psycho-social well-being. The present study sought to empirically disentangle the directionality of the relationship between subjective well-being and social well-being over time. The study used three waves of survey data, with intervals of 10 years, from the Midlife in the United States (MIDUS) project, a representative longitudinal panel study of American adults (N = 2732). Cross-lagged panel modeling was used for data analysis. The results revealed that social well-being predicted increases in subsequent subjective well-being, whereas subjective well-being did not prospectively predict social well-being. Social well-being also demonstrated more stability over time than did subjective well-being. These findings suggest that optimal social functioning is more likely to be an antecedent to subjective well-being, not the other way around. The results are consistent with predictions guided by self-determination theory.

Risk assessment in ramps for heavy vehicles--A French study.

PubMed

Cerezo, Veronique; Conche, Florence

2016-06-01

This paper presents the results of a study dealing with the risk for heavy vehicles in ramps. Two approaches are used. On one hand, statistics are applied on several accidents databases to detect if ramps are more risky for heavy vehicles and to define a critical value for longitudinal slope. χ(2) test confirmed the risk in ramps and statistical analysis proved that a longitudinal slope superior to 3.2% represents a higher risk for heavy vehicles. On another hand, numerical simulations allow defining the speed profile in ramps for two types of heavy vehicles (tractor semi-trailer and 2-axles rigid body) and different loads. The simulations showed that heavy vehicles must drive more than 1000 m on ramps to reach their minimum speed. Moreover, when the slope is superior to 3.2%, tractor semi-trailer presents a strong decrease of their speed until 50 km/h. This situation represents a high risk of collision with other road users which drive at 80-90 km/h. Thus, both methods led to the determination of a risky configuration for heavy vehicles: ramps with a length superior to 1000 m and a slope superior to 3.2%. An application of this research work concerns design methods and guidelines. Indeed, this study provides threshold values than can be used by engineers to make mandatory specific planning like a lane for slow vehicles. Copyright © 2016 Elsevier Ltd. All rights reserved.

Recruiting online: lessons from a longitudinal survey of contraception and pregnancy intentions of young Australian women.

PubMed

Harris, Melissa L; Loxton, Deborah; Wigginton, Britta; Lucke, Jayne C

2015-05-15

Recruitment of young people for epidemiologic research remains challenging, with marked decreases in the effectiveness of face-to-face, mail, and telephone recruitment methods. We report on the implementation and feasibility of an innovative and flexible approach used to recruit participants for a longitudinal cohort study about contraceptive use and pregnancy (the Contraceptive Use, Pregnancy Intention, and Decisions (CUPID) Study). Australian women aged 18-23 years were recruited using a range of online, networking, and offline methods, including social media (primarily Facebook (Facebook Inc., Menlo Park, California; http://www.facebook.com)), face-to-face events, distribution of promotional material, and media releases. Over the course of the 1-year recruitment period (beginning in September 2012), a total of 3,795 eligible women were recruited to complete the online survey, at a cost of approximately A$11 per participant. This sample was found to be broadly representative of the Australian population of women aged 18-23 years in terms of demographic characteristics, with the exception of an overrepresentation of tertiary-educated women (88.7% compared with 72.6%). This study demonstrated that although current recruitment strategies are required to be innovative and flexible in order to engage young people in epidemiologic research, representative samples can be achieved online at reasonable cost. © The Author 2015. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

A longitudinal study of women's depression symptom profiles during and after the postpartum phase.

PubMed

Fox, Molly; Sandman, Curt A; Davis, Elysia Poggi; Glynn, Laura M

2018-04-01

An issue of critical importance for psychiatry and women's health is whether postpartum depression (PPD) represents a unique condition. The Diagnostic and Statistical Manual of Mental Disorders asserts that major depressive disorder (MDD) may present with peripartum onset, without suggesting any other differences between MDD and PPD. The absence of any distinct features calls into question the nosologic validity of PPD as a diagnostic category. The present study investigates whether symptom profiles differ between PPD and depression occurring outside the postpartum phase. In a prospective, longitudinal study of parturient women (N = 239), we examine the manifestation of depression symptoms. We assess factor structure of symptom profiles, and whether factors are differentially pronounced during and after the postpartum period. Factors were revealed representing: Worry, Emotional/Circadian/Energetic Dysregulation, Somatic/Cognitive, Appetite, Distress Display, and Anger symptoms. The factor structure was validated at postpartum and after-postpartum timepoints. Interestingly, the Worry factor, comprising anxiety and guilt, was significantly more pronounced during the postpartum timepoint, and the Emotional/Circadian/Energetic Dysregulation factor, which contained sadness and anhedonia, was significantly less pronounced during the postpartum period. These results suggest that PPD may be a unique syndrome, necessitating research, diagnosis, and treatment strategies distinct from those for MDD. Results indicate the possibility that Worry is an enhanced feature of PPD compared to depression outside the postpartum period, and the crucial role of sadness/anhedonia in MDD diagnosis may be less applicable to PPD diagnosis. © 2018 Wiley Periodicals, Inc.

Cohort Profile: The Social Environment and Biomarkers of Aging Study (SEBAS) in Taiwan

PubMed Central

Cornman, Jennifer C; Glei, Dana A; Goldman, Noreen; Chang, Ming-Cheng; Lin, Hui-Sheng; Chuang, Yi-Li; Hurng, Baai-Shyun; Lin, Yu-Hsuan; Lin, Shu-Hui; Liu, I-Wen; Liu, Hsia-Yuan; Weinstein, Maxine

2016-01-01

The Social Environment and Biomarkers of Aging Study (SEBAS) is a nationally representative longitudinal survey of Taiwanese middle-aged and older adults. It adds the collection of biomarkers and performance assessments to the Taiwan Longitudinal Study of Aging (TLSA), a nationally representative study of adults aged 60 and over, including the institutionalized population. The TLSA began in 1989, with follow-ups approximately every 3 years; younger refresher cohorts were added in 1996 and 2003. The first wave of SEBAS, based on a sub-sample of respondents from the 1999 TLSA, was conducted in 2000. A total of 1023 respondents completed both a face-to-face home interview and, several weeks later, a hospital-based physical examination. In addition to a 12-h (7 pm–7 am) urine specimen collected the night before and a fasting blood specimen collected during the examination, trained staff measured blood pressure, height, weight and waist and hip circumferences. A second wave of SEBAS was conducted in 2006 using a similar protocol to SEBAS 2000, but with the addition of performance assessments conducted by the interviewers at the end of the home interview. Both waves of SEBAS also included measures of health status (physical, emotional, cognitive), health behaviours, social relationships and exposure to stressors. The SEBAS data, which are publicly available at [http://www.icpsr.umich.edu/icpsrweb/NACDA/studies/3792/version/5], allow researchers to explore the relationships among life challenges, the social environment and health and to examine the antecedents, correlates and consequences of change in biological measures and health. PMID:25205853

The relationship between childhood weight, dental caries and eating practices in children aged 4-8 years in Australia, 2004-2008.

PubMed

Hooley, M; Skouteris, H; Millar, L

2012-12-01

The association between overweight/obesity and dental caries in children is contentious with studies variously reporting positive or negative associations between the two conditions. Since 1995, Australia has experienced a rise in the prevalence of both conditions in its children. This study investigated the association between child weight, diet and dental problems in a nationally representative sample. Data from 4149 children (51.5% male) participating in the Longitudinal Study of Australian Children (LSAC) were used. The LSAC is a longitudinal study collecting data from a large representative cohort of Australian children; data from the first three waves were included with children aged 4-5 years, 6-7 years, and 8-9 years. Multivariate cross-sectional and prospective analyses were conducted to determine the relationships between child weight, diet and dental problems. Overweight/obesity was associated with sweet drink consumption and dental problems associated with consumption of fatty foods and sweet drinks. Underweight was associated with dental problems cross-sectionally, but both underweight and overweight at age 6-7 years predicted dental problems at age 8-9 years. Dental caries and body weight are influenced by diet. Overweight children may be consuming less fatty food but appear to be consuming more sweet drinks than normal-weight children, which can lead to both increased weight and dental caries. Dietary interventions designed to reduce the development of dental caries may also reduce the development and maintenance of overweight. © 2012 The Authors. Pediatric Obesity © 2012 International Association for the Study of Obesity.

Deadlines at work and sleep quality. Cross-sectional and longitudinal findings among Danish knowledge workers.

PubMed

Rugulies, Reiner; Martin, Marie H T; Garde, Anne Helene; Persson, Roger; Albertsen, Karen

2012-03-01

Exposure to deadlines at work is increasing in several countries and may affect health. We aimed to investigate cross-sectional and longitudinal associations between frequency of difficult deadlines at work and sleep quality. Study participants were knowledge workers, drawn from a representative sample of Danish employees who responded to a baseline questionnaire in 2006 (n = 363) and a follow-up questionnaire in 2007 (n = 302). Frequency of difficult deadlines was measured by self-report and categorized into low, intermediate, and high. Sleep quality was measured with a Total Sleep Quality Score and two indexes (Awakening Index and Disturbed Sleep Index) derived from the Karolinska Sleep Questionnaire. Analyses on the association between frequency of deadlines and sleep quality scores were conducted with multiple linear regression models, adjusted for potential confounders. In addition, we used multiple logistic regression models to analyze whether frequency of deadlines at baseline predicted caseness of sleep problems at follow-up among participants free of sleep problems at baseline. Frequent deadlines were cross-sectionally and longitudinally associated with poorer sleep quality on all three sleep quality measures. Associations in the longitudinal analyses were greatly attenuated when we adjusted for baseline sleep quality. The logistic regression analyses showed that frequent deadlines at baseline were associated with elevated odds ratios for caseness of sleep problems at follow-up, however, confidence intervals were wide in these analyses. Frequent deadlines at work were associated with poorer sleep quality among Danish knowledge workers. We recommend investigating the relation between deadlines and health endpoints in large-scale epidemiologic studies. Copyright © 2011 Wiley Periodicals, Inc.

Age, cohort and period effects in the prevalence of sleep disturbances among older people: the impact of economic downturn.

PubMed

Dregan, Alex; Armstrong, David

2009-11-01

Using two longitudinal and nationally representative datasets, this study employs a cross-cohort analysis to examine age, cohort and period effects in the prevalence of sleep loss through worry for people over the age of 50 in the UK. The likelihood of reporting sleep loss through worry is calculated at two time-points for 7785 respondents from the Health and Activity Survey (HALs) and 21,834 respondents from the English Longitudinal Study of Ageing (ELSA), with baseline information on sleep loss through worry. Descriptive statistical methods were applied to determine the prevalence rates in sleep loss through worry at each survey within both datasets. The results of analysis reveal that sleep loss through worry declined with age, but this pattern was tempered by a temporary increase in the early 1990s. The contemporary economic downturn is suggested as a possible explanation for the significant increase in the prevalence of sleep loss through worry in 1991.

Recent and Past Intimate Partner Abuse and HIV Risk Among Young Women

PubMed Central

Teitelman, Anne M.; Ratcliffe, Sarah J.; Dichter, Melissa E.; Sullivan, Cris M.

2011-01-01

Objective To examine the associations between past intimate partner abuse experienced during adolescence (verbal and physical), recent intimate partner abuse (verbal, physical, and sexual), and HIV risk (as indicated by lack of condom use) for sexually active young adult women in relationships with male partners. Design Secondary data analysis of waves II and III of the National Longitudinal Study of Adolescent Health (Add Health). Setting The Add Health Study is a longitudinal, in-home survey of a nationally representative sample of adolescents. Sample Analyses involved 2,058 sexually active young adult women. Main Outcome Measures HIV risk was measured by consistent condom use over the past 12 months. Results Physical and verbal abuse experienced in adolescence were associated with physical/verbal abuse experienced in young adulthood. Young, sexually active women experiencing no abuse in their relationships were more likely to consistently use condoms in the past 12 months than were their abused counterparts. Conclusion A causal pathway may exist between prior abuse, current abuse, and HIV risk. PMID:18336447

A Longitudinal Analysis of the Causal Factors in Major Maritime Accidents in the USA and Canada (1996-2006)

NASA Technical Reports Server (NTRS)

Johnson, C. W.; Holloway, C, M.

2007-01-01

Accident reports provide important insights into the causes and contributory factors leading to particular adverse events. In contrast, this paper provides an analysis that extends across the findings presented over ten years investigations into maritime accidents by both the US National Transportation Safety Board (NTSB) and Canadian Transportation Safety Board (TSB). The purpose of the study was to assess the comparative frequency of a range of causal factors in the reporting of adverse events. In order to communicate our findings, we introduce J-H graphs as a means of representing the proportion of causes and contributory factors associated with human error, equipment failure and other high level classifications in longitudinal studies of accident reports. Our results suggest the proportion of causal and contributory factors attributable to direct human error may be very much smaller than has been suggested elsewhere in the human factors literature. In contrast, more attention should be paid to wider systemic issues, including the managerial and regulatory context of maritime operations.

Examining the link between women's exposure to stressful life events prior to conception and infant and toddler health: the role of birth weight.

PubMed

Cheng, Erika R; Park, Hyojun; Wisk, Lauren E; Mandell, Kara C; Wakeel, Fathima; Litzelman, Kristin; Chatterjee, Debanjana; Witt, Whitney P

2016-03-01

The life course perspective suggests a pathway may exist among maternal exposure to stressful life events prior to conception (PSLEs), infant birth weight and subsequent offspring health, whereby PSLEs are part of a 'chains-of-risk' that set children on a certain health pathway. No prior study has examined the link between PSLEs and offspring health in a nationally representative sample of US mothers and their children. We used longitudinal, nationally representative data to evaluate the relation between maternal exposure to PSLEs and subsequent measures of infant and toddler health, taking both maternal and obstetric characteristics into account. We examined 6900 mother-child dyads participating in 2 waves of the nationally representative Early Childhood Longitudinal Study-Birth Cohort (n=6900). Infant and toddler health outcomes assessed at 9 and 24 months included overall health status, special healthcare needs and severe health conditions. Adjusted path analyses examined associations between PSLEs, birth weight and child health outcomes. In adjusted analyses, PSLEs increased the risk for very low birth weight (VLBW, <1500 g), which, in turn, predicted poor health at both 9 and 24 months of age. Path analyses demonstrated that PSLEs had small indirect effects on children's subsequent health that operated through VLBW. Our analysis suggests a chains-of-risk model in which women's exposure to PSLEs increases the risk for giving birth to a VLBW infant, which, in turn, adversely affects infant and toddler health. Addressing women's preconception health may have important downstream benefits for their children, although more research is needed to replicate these findings. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

Examining the link between women’s exposure to stressful life events prior to conception and infant and toddler health: The role of birthweight

PubMed Central

Cheng, Erika R.; Park, Hyojun; Wisk, Lauren E.; Mandell, Kara C.; Wakeel, Fathima; Litzelman, Kristin; Chatterjee, Debanjana; Witt, Whitney P.

2015-01-01

Background The lifecourse perspective suggests a pathway may exist among maternal exposure to stressful life events prior to conception (PSLEs), infant birthweight, and subsequent offspring health, whereby PLSEs are part of a “chains-of-risk” that set children on a certain health pathway. No prior study has examined the link between PSLEs and offspring health in a nationally-representative sample of US mothers and their children. We used longitudinal, nationally-representative data to evaluate the relation between maternal exposure to PSLEs and subsequent measures of infant and toddler health, taking both maternal and obstetric characteristics into account. Methods We examined 6,900 mother-child dyads participating in two waves of the nationally-representative Early Childhood Longitudinal Study-Birth Cohort (n=6,900). Infant and toddler health outcomes assessed at 9 and 24 months included overall health status, special health care needs, and severe health conditions. Adjusted path analyses examined associations between PSLEs, birthweight, and child health outcomes. Results In adjusted analyses, PSLEs increased the risk for very low birthweight (VLBW, <1,500 grams), which, in turn, predicted poor health at both 9 and 24 months of age. Path analyses demonstrated that PSLEs had small indirect effects on children’s subsequent health that operated through VLBW. Conclusion Our analysis suggests a chains-of-risk model in which women’s exposure to PSLEs increases the risk for giving birth to a VLBW infant, which, in turn, adversely affects infant and toddler health. Addressing women’s preconception health may have important downstream benefits for their children, although more research is needed to replicate these findings. PMID:26500337

Constellation Stick Figures Convey Information about Gravity and Neutrinos

NASA Astrophysics Data System (ADS)

Mc Leod, David Matthew; Mc Leod, Roger David

2008-10-01

12/21/98, at America's Stonehenge, DMM detected, and drew, the full stick-figure equivalent of Canis Major, CM, as depicted by our Wolf Clan leaders, and many others. Profound, foundational physics is implied, since this occurred in the Watch House there, hours before the ``model rose.'' Similar configurations like Orion, Osiris of ancient Egypt, show that such figures are projected through solid parts of the Earth, as two-dimensional equivalents of the three-dimensional star constellations. Such ``sticks'' indicate that ``line equivalents'' connect the stars, and the physical mechanism projects outlines detectable by traditional cultures. We had discussed this ``flashlight'' effect, and recognized some of its implications. RDM states that the flashlight is a strong, distant neutrino source; the lines represent neutrinos longitudinally aligned in gravitational excitation, opaque, to earthbound, transient, transversely excited neutrinos. ``Sticks'' represent ``graviton'' detection. Neutrinos' longitudinal alignment accounts for the weakness of gravitational force.

High angle-of-attack aerodynamics of a strake-canard-wing V/STOL fighter configuration

NASA Technical Reports Server (NTRS)

Durston, D. A.; Schreiner, J. A.

1983-01-01

High angle-of-attack aerodynamic data are analyzed for a strake-canard-wing V/STOL fighter configuration. The configuration represents a twin-engine supersonic V/STOL fighter aircraft which uses four longitudinal thrust-augmenting ejectors to provide vertical lift. The data were obtained in tests of a 9.39 percent scale model of the configuration in the NASA Ames 12-Foot Pressure Wind Tunnel, at a Mach number of 0.2. Trimmed aerodynamic characteristics, longitudinal control power, longitudinal and lateral/directional stability, and effects of alternate strake and canard configurations are analyzed. The configuration could not be trimmed (power-off) above 12 deg angle of attack because of the limited pitch control power and the high degree of longitudinal instability (28 percent) at this Mach number. Aerodynamic center location was found to be controllable by varying strake size and canard location without significantly affecting lift and drag. These configuration variations had relatively little effect on the lateral/directional stability up to 10 deg angle of attack.

An economic analysis of community-level fast food prices and individual-level fast food intake: longitudinal effects

PubMed Central

Gordon-Larsen, Penny; Guilkey, David K.; Popkin, Barry M.

2011-01-01

Background While dietary intake is shaped by cost, there is minimal research on the association between community-level food prices and dietary intake. Methods We used nationally representative, longitudinal data to examine how community-level food price variation was associated with individual-level fast food intake by race/ethnicity and income across waves II (1996) and III (2001–02) of The National Longitudinal Study of Adolescent Health (n=11,088) from 158 baseline and 363 follow-up US counties. Results Negative binomial regression models predicting the number of fast food meals per week show strong relationships between fast food consumption and prices of fast food and soda that varied by gender and race/ethnicity. We found relatively stronger association between food prices and fast food intake for males and relatively greater price sensitivity for soda versus burgers. In the group with strongest associations (black males), a 20% increase in price of soda was associated with a decrease of a 0.25 visits to a fast food restaurant per week. Conclusions Economic incentives may be an effective mechanism to address fast food intake in an age group at high risk for obesity. PMID:21852178

The effect of longitudinal conductance variations on the ionospheric prompt penetration electric fields

NASA Astrophysics Data System (ADS)

Sazykin, S.; Wolf, R.; Spiro, R.; Fejer, B.

Ionospheric prompt penetration electric fields of magnetospheric origin, together with the atmospheric disturbance dynamo, represent the most important parameters controlling the storm-time dynamics of the low and mid-latitude ionosphere. These prompt penetration fields result from the disruption of region-2 field-aligned shielding currents during geomagnetically disturbed conditions. Penetration electric fields con- trol, to a large extent, the generation and development of equatorial spread-F plasma instabilities as well as other dynamic space weather phenomena in the ionosphere equatorward of the auroral zone. While modeling studies typically agree with average patterns of prompt penetration fields, experimental results suggest that longitudinal variations of the ionospheric con- ductivities play a non-negligible role in controlling spread-F phenomena, an effect that has not previously been modeled. We present first results of modeling prompt pene- tration electric fields using a version of the Rice Convection Model (RCM) that allows for longitudinal variations in the ionospheric conductance tensor. The RCM is a first- principles numerical ionosphere-magnetosphere coupling model that solves for the electric fields, field-aligned currents, and particle distributions in the ionosphere and inner/middle magnetosphere. We compare these new theoretical results with electric field observations.

Longitudinal β-Amyloid Deposition and Hippocampal Volume in Preclinical Alzheimer Disease and Suspected Non-Alzheimer Disease Pathophysiology.

PubMed

Gordon, Brian A; Blazey, Tyler; Su, Yi; Fagan, Anne M; Holtzman, David M; Morris, John C; Benzinger, Tammie L S

2016-10-01

Preclinical Alzheimer disease (AD) can be staged using a 2-factor model denoting the presence or absence of β-amyloid (Aβ+/-) and neurodegeneration (ND+/-). The association of these stages with longitudinal biomarker outcomes is unknown. To examine whether longitudinal Aβ accumulation and hippocampal atrophy differ based on initial preclinical staging. This longitudinal population-based cohort study used data collected at the Knight Alzheimer Disease Research Center, Washington University, St Louis, Missouri, from December 1, 2006, to June 31, 2015. Cognitively normal older adults (n = 174) were recruited from the longitudinal Adult Children Study and Healthy Aging and Senile Dementia Study at the Knight Alzheimer Disease Research Center. At baseline, all participants had magnetic resonance imaging (MRI) scans, positron emission tomography (PET) scans with carbon 11-labeled Pittsburgh Compound B (PiB), and cerebrospinal fluid assays of tau and phosphorylated tau (ptau) acquired within 12 months. Using the baseline biomarkers, individuals were classified into preclinical stage 0 (Aβ-/ND-), 1 (Aβ+/ND-), or 2+ (Aβ+/ND+) or suspected non-AD pathophysiology (SNAP; Aβ-/ND+). Subsequent longitudinal accumulation of Aβ assessed with PiB PET and loss of hippocampal volume assessed with MRI in each group. Among the 174 participants (81 men [46.6%]; 93 women [53.4%]; mean [SD] age, 65.7 [8.9] years), a proportion (14%-17%) of individuals with neurodegeneration alone (SNAP) later demonstrated Aβ+. The rates of Aβ accumulation and loss of hippocampal volume in individuals with SNAP were indistinguishable from those without any pathologic features at baseline (for Aβ accumulation: when hippocampal volume was used to define ND, t = 0.00 [P > .99]; when tau and ptau were used to define ND, t = -0.02 [P = .98]; for loss of hippocampal volume: when hippocampal volume was used to define ND, t = -1.34 [P = .18]; when tau and ptau were used to define ND, t = 0.84 [P = .40]). Later preclinical stages (stages 1 and 2+) had elevated Aβ accumulation. Using hippocampal volume to define ND, individuals with stage 1 had accelerated Aβ accumulation relative to stage 0 (t = 11.06; P < .001), stage 2+ (t = 2.10; P = .04), and SNAP (t = 9.32; P < .001), and those with stage 2+ had accelerated Aβ accumulation relative to stage 0 (t = 4.38; P < .001) and SNAP (t = 4.08; P < .001). When ND was defined using tau and ptau, individuals with stage 2+ had accelerated Aβ accumulation relative to stage 0 (t = 4.96) and SNAP (t = 4.06), and those with stage 1 had accelerated Aβ accumulation relative to stage 0 (t = 8.44) and SNAP (t = 6.61) (P < .001 for all comparisons). When ND was defined using cerebrospinal fluid biomarkers, individuals with stage 2+ had accelerated hippocampal atrophy relative to stage 0 (t = -3.41; P < .001), stage 1 (t = -2.48; P = .03), and SNAP (t = -2.26; P = .03). More advanced preclinical stages of AD have greater longitudinal Aβ accumulation. SNAP appears most likely to capture inherent individual variability in brain structure or to represent comorbid pathologic features rather than early emerging AD. Low hippocampal volumes or elevated levels of tau or ptau in isolation may not accurately represent ongoing neurodegenerative processes.

The education of scientists: Gender differences during the early life course

NASA Astrophysics Data System (ADS)

Shauman, Kimberlee Akin

In this dissertation, I examine gender differences in the science and engineering (S/E) educational trajectory--the pre-college and college experiences that lead to specialized education and qualification for an S/E occupation. This research makes important contributions by providing detailed and updated information about gender differences in the timing and causal mechanisms for flows into and out of the S/E educational trajectory. By using longitudinal data to model the linkages between past and future science experiences, I measure the dynamic process underlying the S/E educational trajectory and challenge the predominant "science pipeline" conceptualization of this process. I use the life course perspective as a guide to conceptualizing the S/E trajectory and to analyzing the social forces that shape the educational and career goals of individual women and men. I develop a conceptual model that specifies how the effects of a set of social influences gradually shift in measurable and predictable ways over the educational "life histories" of individuals. The causal factors in the model are (1) individual influences such as ability and attitudes, (2) familial influences, and (3) the influence of significant others in the social structure. To uncover gender differences in the process of becoming a scientist, I use four nationally representative longitudinal studies: the National Education Longitudinal Study of 1988, the Longitudinal Study of American Youth, the High School and Beyond, and the National Longitudinal Study of the Class of 1972. The empirical analyses of this dissertation focus on the individual and familial influences on participation in the S/E educational trajectory. Past experience in S/E education increases the likelihood of future participation, but persistence in the S/E trajectory is not the only viable route to S/E degree attainment. Entry into S/E majors during college is common, and it is a prevalent path to an S/E bachelor's degree, especially for women. The transition from high school to college is the point where the educational paths of males and females diverge significantly. Expectations about future family roles have the greatest influence on the gender differences in the patterns of participation in the S/E educational trajectory.

Child Care Subsidies and School Readiness in Kindergarten

PubMed Central

Johnson, Anna D; Martin, Anne; Brooks-Gunn, Jeanne

2013-01-01

The federal child care subsidy program represents one of the government’s largest investments in early care and education. Using data from the nationally representative Early Childhood Longitudinal Study – Birth Cohort (ECLS-B), this paper examines associations, among subsidy-eligible families, between child care subsidy receipt when children are 4 years old and a range of school readiness outcomes in kindergarten (sample n ≈ 1,400). Findings suggest that subsidy receipt in preschool is not directly linked to subsequent reading or social-emotional skills. However, subsidy receipt predicted lower math scores among children attending community-based centers. Supplementary analyses revealed that subsidies predicted greater use of center care, but this association did not appear to affect school readiness. PMID:23461769

Assessment of pharmacy manpower and services in West Virginia.

PubMed

Robinson, Evan T; Bowyer, David

2006-09-01

The shortage of pharmacists across the nation has been much publicized and has been identified as one of the reasons for new schools of pharmacy to open or for existing colleges and schools of pharmacy to increase their class sizes. This article represents the assessment of a new school of pharmacy's evaluation of staffing and practice in its geographic area. This survey represents the first data point within the School of Pharmacy assessment plan and will be repeated at several intervals after the program opens to longitudinally evaluate its impact on pharmacy staffing and services within West Virginia. Using a modified Dillman survey methodology a random sample of 548 pharmacists in West Virginia, approximately one-third the active roster, were surveyed regarding staffing and services in West Virginia. A response rate of 32.78% was achieved and findings indicated that there is a staffing shortage of pharmacists within West Virginia, that staffing impacts the services pharmacists provide, and that more pharmacists would be willing to offer disease management services if staffing levels were at appropriate levels. A shortage of pharmacists does exist in West Virginia and it has implications on patient care. Longitudinal evaluation of the impact of a new pharmacy program will be conducted and the staffing and services within West Virginia should be continued to be studied.

Anthropometric Differences between HIV-Infected Individuals Prior to Antiretroviral Treatment and the General Population from 1998–2007: The AIDS Clinical Trials Group Longitudinal Linked Randomized Trials (ALLRT) Cohort and NHANES

PubMed Central

Atkinson, Benjamin E.; Krishnan, Supriya; Cox, Gary; Hulgan, Todd; Collier, Ann C.

2013-01-01

Objective To assess differences in body circumferences and body mass index (BMI, kg/m2) between antiretroviral treatment (ART) naïve HIV-infected and HIV-uninfected persons. Methods Waist, arm, and thigh circumferences and BMI were measured within the ALLRT and NHANES cohorts between 1998 and 2007. ALLRT is a prospective, longitudinal study of U.S. participants enrolled in randomized HIV treatment studies conducted by the AIDS Clinical Trials Group (ACTG). NHANES is a representative group of the US population. The cohorts were analyzed in two time periods, to account for trends towards increased adiposity. Anthropometrics were displayed in percentiles by age and sex. Multiple linear regression models examined differences between cohorts. Results ALLRT had more males (82% versus 48%, p<0.0001), more black participants (32% versus 23%, p<0.0001), and less Hispanics (21% versus 30%, p<0.0001) than NHANES. Mean BMI was smaller in ALLRT males and females compared to NHANES by 1.6–2.4 kg/m2 (p<0.0001). Mean waist and arm circumferences in both sexes and time periods were significantly smaller in ALLRT than in NHANES (p<0.0001). Mean thigh circumference in ALLRT was also smaller than NHANES among males (p<0.0001 in both time periods) and females (p = 0.01 in the early time period). Conclusions Differences in anthropometrics existed prior to ART initiation, in this large national cohort of HIV-infected individuals, compared to a representative HIV-uninfected cohort, indicating that HIV and its complications have important effects on body shape. Further longitudinal examination of anthropometrics in this HIV-infected cohort may provide additional insight into disease risk. Trial Registration NCT00001137 at www.clinicaltrials.gov. PMID:23755215

The impact of wealth on the cognitive development of children who were preterm infants.

PubMed

Braid, Susan; Donohue, Pamela K; Strobino, Donna M

2012-08-01

: The purpose of this study was to explore the influence wealth has on cognitive development in 2-year-old children who were born preterm, and to determine whether racial/ethnic differences in wealth explained disparities in cognitive development. : A nationally representative sample of 1400 children who were born between 22 and 36 weeks' gestation. : Cohort study. : Secondary data analysis of the Early Childhood Longitudinal Survey-Birth Cohort (ECLS-B). The ECLS-B was a prospective national longitudinal study of infants born in the United States during the calendar year 2001 drawn from birth certificates in the United States. : The impact wealth (parental homeownership and investments) had on cognitive development at 2 years and whether wealth eliminated the cognitive disparity seen between white, African American, and Hispanic children. : Wealth (homeownership and investments) did not have an independent effect on cognitive development, but it did eliminate the disparity between white children and African American children (P ≥ .05). However, wealth did not eliminate the disparity in cognitive development between white children and Hispanic children. Hispanic children scored 3.91 points lower than white children (P ≤ .001). : In contrast to other follow-up studies showing persistent differences in cognitive development between white children and African American children, this study found that wealth indicators attenuated the difference. Wealth may be a more accurate proxy for socioeconomic status in studying factors influencing cognitive outcomes in children born preterm than just using measures such as maternal education and income. In future follow-up studies of multiracial preterm children, indicators that represent wealth should be included for an accurate representation of social economic status.

Challenges associated with recruiting multigenerational, multicultural families into a randomised controlled trial: Balancing feasibility with validity.

PubMed

Hughes, Donna; Hutchinson, Amanda; Prichard, Ivanka; Chapman, Janine; Wilson, Carlene

2015-07-01

Recruitment of participants into research studies has become an increasingly difficult task with justifiable criticisms of representativeness of samples. The difficulties of recruitment are exacerbated when the study is longitudinal, requires multiple members from one family and incorporates people from non-dominant ethnic backgrounds. This paper describes a complex trial's recruitment process. Family groups were required for a longitudinal randomised controlled trial investigating links between health and dietary behaviours with an aim to improve primary prevention health messages and initiatives. To be representative of the multi-ethnic composition of the South Australian population, families from three of South Australia's largest ethnic backgrounds were invited to participate. Of these, only families with participating members spanning three generations were enrolled, so that links between health and lifestyle behaviours with possible generational ties could be investigated. Immense difficulties were faced during recruitment and significant modifications to the initial recruitment plan were necessary to enable the enrolment of 96 families. Challenges faced included lack of response to recruitment materials displaying complex eligibility criteria and different response outcomes from different communities. Solutions implemented included simplifying materials and tailoring recruitment activities to specific communities' needs. This trial's recruitment journey will be used as a case study to highlight the practicalities of recruiting for complex trials. Recommendations will be provided for future researchers seeking to recruit multigenerational, multi-ethnic families into the same study, along with issues to consider regarding the implications of the recruitment journey on the integrity of a complex trial and the potential threats to internal validity. Copyright © 2015 Elsevier Inc. All rights reserved.

Retaining young people in a longitudinal sexual health survey: a trial of strategies to maintain participation

PubMed Central

2010-01-01

Background There is an increasing trend towards lower participation in questionnaire surveys. This reduces representativeness, increases costs and introduces particular challenges to longitudinal surveys, as researchers have to use complex statistical techniques which attempt to address attrition. This paper describes a trial of incentives to retain longitudinal survey cohorts from ages 16 to 20, to question them on the sensitive topic of sexual health. Methods A longitudinal survey was conducted with 8,430 eligible pupils from two sequential year groups from 25 Scottish schools. Wave 1 (14 years) and Wave 2 (16 years) were conducted largely within schools. For Wave 3 (18 years), when everyone had left school, the sample was split into 4 groups that were balanced across predictors of survey participation: 1) no incentive; 2) chance of winning one of twenty-five vouchers worth £20; 3) chance of winning one £500 voucher; 4) a definite reward of a £10 voucher sent on receipt of their completed questionnaire. Outcomes were participation at Wave 3 and two years later at Wave 4. Analysis used logistic regression and adjusted for clustering at school level. Results The only condition that had a significant and beneficial impact for pupils was to offer a definite reward for participation (Group 4). Forty-one percent of Group 4 participated in Wave 3 versus 27% or less for Groups 1 to 3. At Wave 4, 35% of Group 4 took part versus 25% or less for the other groups. Similarly, 22% of Group 4 participated in all four Waves of the longitudinal study, whereas for the other three groups it was 16% or less that participated in full. Conclusions The best strategy for retaining all groups of pupils and one that improved retention at both age 18 and age 20 was to offer a definite reward for participation. This is expensive, however, given the many benefits of retaining a longitudinal sample, we recommend inclusion of this as a research cost for cohort and other repeat-contact studies. PMID:20109221

National Traffic Speeds Survey II : 2009

DOT National Transportation Integrated Search

2012-07-01

A field survey was conducted during spring and summer 2009 as a longitudinal repetition to a similar effort undertaken : in 2007. The goal was to measure travel speeds and prepare nationally representative speed estimates for all types of : motor veh...

National Traffic Speeds Survey III: 2015

DOT National Transportation Integrated Search

2018-03-01

A field survey was conducted during the summer of 2015 as a longitudinal repetition to similar efforts undertaken in 2007 and 2009. The goal was to measure travel speeds and prepare nationally representative speed estimates for all types of motor veh...

Are perfectionistic concerns an antecedent of or a consequence of binge eating, or both? A short-term four-wave longitudinal study of undergraduate women.

PubMed

Smith, Martin M; Sherry, Simon B; Gautreau, Chantal M; Stewart, Sherry H; Saklofske, Donald H; Mushquash, Aislin R

2017-08-01

The perfectionism model of binge eating (PMOBE) posits perfectionistic concerns are a vulnerability factor for binge eating. And evidence indicates perfectionistic concerns and binge eating correlate positively. However, the direction of this relationship is seldom studied. Accordingly, it is unclear whether perfectionistic concerns represent an antecedent of binge eating (a vulnerability effect with perfectionistic concerns predicting increases in binge eating), a consequence of binge eating (a complication effect with binge eating predicting increases in perfectionistic concerns), or both (reciprocal relations with perfectionistic concerns predicting increases in binge eating and vice versa). To address these questions, we studied 200 undergraduate women using a 4-week, 4-wave cross-lagged longitudinal design. Consistent with the PMOBE, perfectionistic concerns predicted increased binge eating (vulnerability effect). But, binge eating did not predict increased perfectionistic concerns (complication effect). Findings support the long-held theory that perfectionistic concerns are part of the premorbid personality of women vulnerable to binge eating. Copyright © 2017 Elsevier Ltd. All rights reserved.

The impact of school suspension on student tobacco use: A longitudinal study in Victoria, Australia and Washington State, United States

PubMed Central

Hemphill, Sheryl A.; Heerde, Jessica A.; Herrenkohl, Todd I.; Toumbourou, John W.; Catalano, Richard F.

2011-01-01

Context School suspension may have unintended consequences in contributing to problem behaviors including school drop-out, substance use, and antisocial behavior. Tobacco use is an early-onset problem behavior, but prospective studies of the effects of suspension on tobacco use are lacking. Method Longitudinal school-based survey of students drawn as a 2-stage cluster sample, administered in 2002 and 2003 in Washington State, United States and Victoria, Australia. The study uses statewide representative samples of students in Grades 7 and 9 (N = 3,599). Results Rates of tobacco use were higher for Victorian than Washington State students. School suspension remained a predictor of current tobacco use at 12-month follow-up, after controlling for established risk factors including prior tobacco and other drug use for Grade 7 but not Grade 9 students. Conclusions School suspension is associated with tobacco use in early adolescence, itself an established predictor of adverse outcomes in young people. Findings suggest the need to explore process mechanisms and alternatives to school suspensions as a response to challenging student behavior in early adolescence. PMID:21586667

Global positive expectancies in adolescence and health-related behaviours: Longitudinal models of latent growth and cross-lagged effects

PubMed Central

Carvajal, Scott C.

2015-01-01

Constructs representative of global positive expectancies (GPE) such as dispositional optimism and hope have been theoretically and empirically linked to many positive mental and physical health outcomes. However such expectancies’ health implications for adolescents, as well as their trajectory over time, are less well understood than for adult populations. This study tested whether GPE predict the key indicators of adolescents’ future physical health status, their health-related behaviours. A prospective longitudinal study design was employed whereby a diverse population-based cohort (N = 744; mean age at baseline = 12) completed three surveys over approximately 18 months. Rigorous tests of causal predominance and reciprocal effects were conducted through latent growth and cross-panel structural equation models. Results showed GPE systematically decreased during the course of the study, yet higher initial levels of GPE predicted less alcohol drinking, healthier food choice and greater physical activity over time. GPE’s protective relationships towards health protective behaviours (vs. health risk behaviours that also included tobacco smoking) appear more independent from depressive symptomatology, and the primary findings were robust across socio-demographic groups. PMID:22149606

Association between interpersonal trust, reciprocity, and suicidal behaviors: A longitudinal cohort study in South Korea.

PubMed

Kim, Ja Young; Yoon, Jaehong; Kim, Myoung-Hee; Kim, Seung-Sup

2017-06-01

While a growing body of evidence suggest that social capital including interpersonal trust and reciprocity might be associated with mental health outcomes, few studies have explored the relationship with suicidal behaviors. This research examined the prospective association between interpersonal trust and reciprocity and suicidal behaviors using the Korea Welfare Panel Study, a nationally representative longitudinal cohort dataset in South Korea. Interpersonal trust and reciprocity were assessed at the 7th wave of the survey (2012), and each measure was classified into two categories (low vs. high). Experience of suicidal ideation, planning, and attempt was assessed between the 8th (2013) and 10th wave (2015) of the surveys. After adjusting for confounders including lifetime experience of suicidal behaviors at the 7th wave of the survey (2012) as well as socio-demographic information, the low interpersonal trust group was more likely to experience suicidal ideation (OR: 1.30, 95% CI: 1.11-1.53) compared to the high interpersonal trust group whereas no statistically significant association was observed in the reciprocity analysis. Copyright © 2017 Elsevier Inc. All rights reserved.

The dorsal tectal longitudinal column (TLCd): a second longitudinal column in the paramedian region of the midbrain tectum.

PubMed

Aparicio, M-Auxiliadora; Saldaña, Enrique

2014-03-01

The tectal longitudinal column (TLC) is a longitudinally oriented, long and narrow nucleus that spans the paramedian region of the midbrain tectum of a large variety of mammals (Saldaña et al. in J Neurosci 27:13108-13116, 2007). Recent analysis of the organization of this region revealed another novel nucleus located immediately dorsal, and parallel, to the TLC. Because the name "tectal longitudinal column" also seems appropriate for this novel nucleus, we suggest the TLC described in 2007 be renamed the "ventral tectal longitudinal column (TLCv)", and the newly discovered nucleus termed the "dorsal tectal longitudinal column (TLCd)". This work represents the first characterization of the rat TLCd. A constellation of anatomical techniques was used to demonstrate that the TLCd differs from its surrounding structures (TLCv and superior colliculus) cytoarchitecturally, myeloarchitecturally, neurochemically and hodologically. The distinct expression of vesicular amino acid transporters suggests that TLCd neurons are GABAergic. The TLCd receives major projections from various areas of the cerebral cortex (secondary visual mediomedial area, and granular and dysgranular retrosplenial cortices) and from the medial pretectal nucleus. It densely innervates the ipsilateral lateral posterior and laterodorsal nuclei of the thalamus. Thus, the TLCd is connected with vision-related neural centers. The TLCd may be unique as it constitutes the only known nucleus made of GABAergic neurons dedicated to providing massive inhibition to higher order thalamic nuclei of a specific sensory modality.

Defining SNAP by cross-sectional and longitudinal definitions of neurodegeneration.

PubMed

Wisse, L E M; Das, S R; Davatzikos, C; Dickerson, B C; Xie, S X; Yushkevich, P A; Wolk, D A

2018-01-01

Suspected non-Alzheimer's pathophysiology (SNAP) is a biomarker driven designation that represents a heterogeneous group in terms of etiology and prognosis. SNAP has only been identified by cross-sectional neurodegeneration measures, whereas longitudinal measures might better reflect "active" neurodegeneration and might be more tightly linked to prognosis. We compare neurodegeneration defined by cross-sectional 'hippocampal volume' only (SNAP/L-) versus both cross-sectional and longitudinal 'hippocampal atrophy rate' (SNAP/L+) and investigate how these definitions impact prevalence and the clinical and biomarker profile of SNAP in Mild Cognitive Impairment (MCI). 276 MCI patients from ADNI-GO/2 were designated amyloid "positive" (A+) or "negative" (A-) based on their florbetapir scan and neurodegeneration 'positive' or 'negative' based on cross-sectional hippocampal volume and longitudinal hippocampal atrophy rate. 74.1% of all SNAP participants defined by the cross-sectional definition of neurodegeneration also met the longitudinal definition of neurodegeneration, whereas 25.9% did not. SNAP/L+ displayed larger white matter hyperintensity volume, a higher conversion rate to dementia over 5 years and a steeper decline on cognitive tasks compared to SNAP/L- and the A- CN group. SNAP/L- had more abnormal values on neuroimaging markers and worse performance on cognitive tasks than the A- CN group, but did not show a difference in dementia conversion rate or longitudinal cognition. Using a longitudinal definition of neurodegeneration in addition to a cross-sectional one identifies SNAP participants with significant cognitive decline and a worse clinical prognosis for which cerebrovascular disease may be an important driver.

Genetic and Environmental Regulation on Longitudinal Change of Metabolic Phenotypes in Danish and Chinese Adult Twins

PubMed Central

Li, Shuxia; Kyvik, Kirsten Ohm; Pang, Zengchang; Zhang, Dongfeng; Duan, Haiping; Tan, Qihua; Hjelmborg, Jacob; Kruse, Torben; Dalgård, Christine

2016-01-01

Objective The rate of change in metabolic phenotypes can be highly indicative of metabolic disorders and disorder-related modifications. We analyzed data from longitudinal twin studies on multiple metabolic phenotypes in Danish and Chinese twins representing two populations of distinct ethnic, cultural, social-economic backgrounds and geographical environments. Materials and Methods The study covered a relatively large sample of 502 pairs of Danish adult twins followed up for a long period of 12 years with a mean age at intake of 38 years (range: 18–65) and a total of 181 Chinese adult twin pairs traced for about 7 years with a mean baseline age of 39.5 years (range: 23–64). The classical twin models were fitted to the longitudinal change in each phenotype (Δphenotype) to estimate the genetic and environmental contributions to the variation in Δphenotype. Results Moderate to high contributions by the unique environment were estimated for all phenotypes in both Danish (from 0.51 for low density lipoprotein cholesterol up to 0.72 for triglycerides) and Chinese (from 0.41 for triglycerides up to 0.73 for diastolic blood pressure) twins; low to moderate genetic components were estimated for long-term change in most of the phenotypes in Danish twins except for triglycerides and hip circumference. Compared with Danish twins, the Chinese twins tended to have higher genetic control over the longitudinal changes in lipids (except high density lipoprotein cholesterol) and glucose, higher unique environmental contribution to blood pressure but no genetic contribution to longitudinal change in body mass traits. Conclusion Our results emphasize the major contribution of unique environment to the observed intra-individual variation in all metabolic phenotypes in both samples, and meanwhile reveal differential patterns of genetic and common environmental regulation on changes over time in metabolic phenotypes across the two samples. PMID:26862898

The AL 333-160 fourth metatarsal from Hadar compared to that of humans, great apes, baboons and proboscis monkeys: non-conclusive evidence for pedal arches or obligate bipedality in Hadar hominins.

PubMed

Mitchell, P J; Sarmiento, E E; Meldrum, D J

2012-10-01

Based on comparisons to non-statistically representative samples of humans and two great ape species (i.e. common chimpanzees Pan troglodytes and lowland gorillas Gorilla gorilla), Ward et al. (2011) concluded that a complete hominin fourth metatarsal (4th MT) from Hadar, AL 333-160, belonged to a committed terrestrial biped with fixed transverse and longitudinal pedal arches, which was no longer under selection favoring substantial arboreal behaviors. According to Ward et al., the Hadar 4th MT had (1) a torsion value indicating a transverse arch, (2) sagittal plane angles between the diaphyseal long axis and the planes of the articular surfaces indicating a longitudinal arch, and (3) a narrow mediolateral to dorsoplantar base ratio, an ectocuneiform facet, and tarsal articular surface contours all indicating a rigid foot without an ape-like mid-tarsal break. Comparisons of the Hadar 4th MT characters to those of statistically representative samples of humans, all five great ape species, baboons and proboscis monkeys show that none of the correlations Ward et al. make to localized foot function were supported by this analysis. The Hadar 4th MT characters are common to catarrhines that have a midtarsal break and lack fixed transverse or longitudinal arches. Further comparison of the AL 333-160 4th MT length, and base, midshaft and head circumferences to those of catarrhines with field collected body weights show that this bone is uniquely short with a large base. Its length suggests the AL 333-160 individual was a poor leaper with limited arboreal behaviors and lacked a longitudinal arch, i.e. its 4th MT long axis was usually held perpendicular to gravity. Its large base implies cuboid-4th MT joint mobility. A relatively short 4th MT head circumference indicates AL 333-160 had small proximal phalanges with a restricted range of mobility. Overall, AL 333-160 is most similar to the 4th MT of eastern gorillas, a slow moving quadruped that sacrifices arboreal behaviors for terrestrial ones. This study highlights evolutionary misconceptions underlying the practice of using localized anatomy and/or a single bony element to reconstruct overall locomotor behaviors and of summarizing great ape structure and behavior based on non-statistically representative samples of only a few living great ape species. Copyright © 2012. Published by Elsevier GmbH.

Contrasting olfaction, vision, and audition as predictors of cognitive change and impairment in non-demented older adults.

PubMed

MacDonald, Stuart W S; Keller, Connor J C; Brewster, Paul W H; Dixon, Roger A

2018-05-01

This study examines the relative utility of a particular class of noninvasive functional biomarkers-sensory functions-for detecting those at risk of cognitive decline and impairment. Three central research objectives were examined including whether (a) olfactory function, vision, and audition exhibited significant longitudinal declines in nondemented older adults; (b) multiwave change for these sensory function indicators predicted risk of mild cognitive impairment (MCI); and (c) change within persons for each sensory measure shared dynamic time-varying associations with within-person change in cognitive functioning. A longitudinal sample (n = 408) from the Victoria Longitudinal Study was assembled. Three cognitive status subgroups were identified: not impaired cognitively, single-assessment MCI, and multiple-assessment MCI. We tested independent predictive associations, contrasting change in sensory function as predictors of cognitive decline and impairment, utilizing both linear mixed models and logistic regression analysis. Olfaction and, to a lesser extent, vision were identified as the most robust predictors of cognitive status and decline; audition showed little predictive influence. These findings underscore the potential utility of deficits in olfactory function, in particular, as an early marker of age- and pathology-related cognitive decline. Functional biomarkers may represent potential candidates for use in the early stages of a multistep screening approach for detecting those at risk of cognitive impairment, as well as for targeted intervention. (PsycINFO Database Record (c) 2018 APA, all rights reserved).

Mechanism of action of substance P in guinea-pig ileum longitudinal smooth muscle: a re-evaluation.

PubMed Central

Hall, J M; Morton, I K

1990-01-01

1. A proposed mechanism of contractile action of substance P in guinea-pig ileum longitudinal smooth muscle involving a decrease in membrane K+ permeability (PK) has been re-examined. 2. Potentiation of responses to substance P by the K+ channel blocker tetraethylammonium (TEA) was originally proposed as evidence for a mechanism of action of substance P involving a decrease in PK. Potentiation was confirmed; however this was found not to be specific to substance P since a similar potentiation of responses was seen with agonists not thought to act via a decrease in PK. 3. Antagonism of contractile responses to substance P by noradrenaline was similarly confirmed. However, this antagonism was found to represent a non-specific functional interaction through the inhibitory actions of beta-adrenoceptors rather than the proposed specific interaction with an increase in PK by noradrenaline which is normally alpha 1-adrenoceptor mediated. 4. Experiments were made measuring 86Rb efflux, in depolarized guinea-pig ileum longitudinal smooth muscle, to estimate PK. These studies confirmed a reported decrease in PK with TEA, but failed to detect the previously reported decrease with substance P. 5. These results, although not disproving a suggested mechanism of direct contractile action of substance P in guinea-pig ileum longitudinal smooth muscle involving a decrease in PK, do throw doubt on either the evidence, or its interpretation, as proposed by the original authors in support of such a mechanism. PMID:1712846

Longitudinal tests of competing factor structures for the Rosenberg Self-Esteem Scale: traits, ephemeral artifacts, and stable response styles.

PubMed

Marsh, Herbert W; Scalas, L Francesca; Nagengast, Benjamin

2010-06-01

Self-esteem, typically measured by the Rosenberg Self-Esteem Scale (RSE), is one of the most widely studied constructs in psychology. Nevertheless, there is broad agreement that a simple unidimensional factor model, consistent with the original design and typical application in applied research, does not provide an adequate explanation of RSE responses. However, there is no clear agreement about what alternative model is most appropriate-or even a clear rationale for how to test competing interpretations. Three alternative interpretations exist: (a) 2 substantively important trait factors (positive and negative self-esteem), (b) 1 trait factor and ephemeral method artifacts associated with positively or negatively worded items, or (c) 1 trait factor and stable response-style method factors associated with item wording. We have posited 8 alternative models and structural equation model tests based on longitudinal data (4 waves of data across 8 years with a large, representative sample of adolescents). Longitudinal models provide no support for the unidimensional model, undermine support for the 2-factor model, and clearly refute claims that wording effects are ephemeral, but they provide good support for models positing 1 substantive (self-esteem) factor and response-style method factors that are stable over time. This longitudinal methodological approach has not only resolved these long-standing issues in self-esteem research but also has broad applicability to most psychological assessments based on self-reports with a mix of positively and negatively worded items.

The impact of an unfavorable depression course on network size and loneliness in older people: a longitudinal study in the community.

PubMed

Houtjes, Wim; van Meijel, Berno; van de Ven, Peter M; Deeg, Dorly; van Tilburg, Theo; Beekman, Aartjan

2014-10-01

This work aims to gain insight into the long-term impact of depression course on social network size and perceived loneliness in older people living in the community. Within a large representative sample of older people in the community (Longitudinal Aging Study Amsterdam (LASA)), participants with clinically relevant levels of depressive symptoms (scores >16 on the Center for Epidemiological Studies Depression Scale) were followed up over a period of 13 years of the LASA study (five waves). General estimating equations were used to estimate the impact of depression course on network size and loneliness and the interaction with gender and age. An unfavorable course of depression was found to be associated with smaller network sizes and higher levels of loneliness over time, especially in men and older participants. The findings of this study stress the importance of clinical attention to the negative consequences of chronicity in depressed older people. Clinicians should assess possible erosion of the social network over time and be aware of increased feelings of loneliness in this patient group. Copyright © 2014 John Wiley & Sons, Ltd.

Stability and Instability of Subjective Well-Being in the Transition from Adolescence to Young Adulthood: Longitudinal Evidence from 20991 Young Australians

PubMed Central

Page, Andrew

2016-01-01

Purpose This study assessed the long-term stability and instability of subjective well-being during post-school transition (i.e., transition from adolescence to young adulthood) and evaluated the determinants of transition stability. Methods Using two cohorts from a national representative longitudinal study, the Longitudinal Study of Australian Youth (N = 20991), latent profile analysis and latent transition analysis were conducted to examine transition patterns among subjective well-being profiles for youth from age 17 to 25. Multinomial logistic regressions were conducted to evaluate whether key socio-demographic variables were associated with transition stability. Results We identified: (1) three subjective well-being profiles: Low (30%), Moderate (50%), and High (20%); and (2) three major transition patterns among these subjective well-being profiles: stable, partially-stable, and unstable. The majority of youth had stable transition patterns during the transition from adolescence to adulthood. A large percentage of youth (52%) started low in subjective well-being profile and remained in the low subjective-wellbeing profile. Our examination also revealed gender was the most pronounced indicator for transition stability during this time period, with males more likely to have unstable transition patterns than females. Conclusions Results suggest that different subjective well-being status and transition patterns can be identified in the post-high school transition to adulthood, including unstable transitions. By targeting those groups more vulnerable to transition, mental health promotion and interventions may be delivered more effectively. PMID:27232183

Sexist games=sexist gamers? A longitudinal study on the relationship between video game use and sexist attitudes.

PubMed

Breuer, Johannes; Kowert, Rachel; Festl, Ruth; Quandt, Thorsten

2015-04-01

From the oversexualized characters in fighting games, such as Dead or Alive or Ninja Gaiden, to the overuse of the damsel in distress trope in popular titles, such as the Super Mario series, the under- and misrepresentation of females in video games has been well documented in several content analyses. Cultivation theory suggests that long-term exposure to media content can affect perceptions of social realities in a way that they become more similar to the representations in the media and, in turn, impact one's beliefs and attitudes. Previous studies on video games and cultivation have often been cross-sectional or experimental, and the limited longitudinal work in this area has only considered time intervals of up to 1 month. Additionally, previous work in this area has focused on the effects of violent content and relied on self-selected or convenience samples composed mostly of adolescents or college students. Enlisting a 3 year longitudinal design, the present study assessed the relationship between video game use and sexist attitudes, using data from a representative sample of German players aged 14 and older (N=824). Controlling for age and education, it was found that sexist attitudes--measured with a brief scale assessing beliefs about gender roles in society--were not related to the amount of daily video game use or preference for specific genres for both female and male players. Implications for research on sexism in video games and cultivation effects of video games in general are discussed.

The role of personality in health care use: Results of a population-based longitudinal study in Germany

PubMed Central

König, Hans-Helmut

2017-01-01

Objective To determine the role of personality in health care use longitudinally. Methods Data were derived from the German Socio-Economic Panel (GSOEP), a nationally representative, longitudinal cohort study of German households starting in 1984. Concentrating on the role of personality, we used data from the years 2005, 2009 and 2013. Personality was measured by using the GSOEP Big Five Inventory (BFI-S). Number of physician visits in the last 3 months and hospital stays in the last year were used as measures of health care use. Results Adjusting for predisposing factors, enabling resources, and need factors, fixed effects regressions revealed that physician visits increased with increasing neuroticism, whereas extraversion, openness to experience, agreeableness and conscientiousness did not affect physician visits in a significant way. The effect of self-rated health on physician visits was significantly moderated by neuroticism. Moreover, fixed effects regressions revealed that the probability of hospitalization in the past year increased with increasing extraversion, whereas the other personality factors did not affect this outcome measure significantly. Conclusion Our findings suggest that changes in neuroticism are associated with changes in physician visits and that changes in extraversion are associated with the probability of hospitalization. Since recent studies have shown that treatments can modify personality traits, developing interventional strategies should take into account personality factors. For example, efforts to intervene in changing neuroticism might have beneficial effects for the healthcare system. PMID:28746388

Short sleep duration as a risk factor for hypercholesterolemia: analyses of the National Longitudinal Study of Adolescent Health.

PubMed

Gangwisch, James E; Malaspina, Dolores; Babiss, Lindsay A; Opler, Mark G; Posner, Kelly; Shen, Sa; Turner, J Blake; Zammit, Gary K; Ginsberg, Henry N

2010-07-01

To explore the relationship between sleep duration in adolescence and hypercholesterolemia in young adulthood. Experimental sleep restriction has been shown to significantly increase total cholesterol and LDL cholesterol levels in women. Short sleep duration has been found in cross sectional studies to be associated with higher total cholesterol and lower HDL cholesterol levels. Sleep deprivation could increase the risk for hypercholesterolemia by increasing appetite and dietary consumption of saturated fats, decreasing motivation to engage in regular physical activity, and increasing stress and resultant catecholamine induced lipolysis. No previous published population studies have examined the longitudinal relationship between sleep duration and high cholesterol. Multivariate longitudinal analyses stratified by sex of the ADD Health using logistic regression. United States nationally representative, school-based, probability-based sample. Adolescents (n = 14,257) in grades 7 to 12 at baseline (1994-95) and ages 18 to 26 at follow-up (2001-02). Among females, each additional hour of sleep was associated with a significantly decreased odds of being diagnosed with high cholesterol in young adulthood (OR = 0.85, 95% CI 0.75-0.96) after controlling for covariates. Additional sleep was associated with decreased, yet not statistically significant, odds ratios for hypercholesterolemia in males (OR = 0.91, 95% CI 0.79-1.05). Short sleep durations in adolescent women could be a significant risk factor for high cholesterol. Interventions that lengthen sleep could potentially serve as treatments and as primary preventative measures for hypercholesterolemia.

Cross-lagged relationships between workplace demands, control, support, and sleep problems.

PubMed

Hanson, Linda L Magnusson; Åkerstedt, Torbjörn; Näswall, Katharina; Leineweber, Constanze; Theorell, Töres; Westerlund, Hugo

2011-10-01

Sleep problems are experienced by a large part of the population. Work characteristics are potential determinants, but limited longitudinal evidence is available to date, and reverse causation is a plausible alternative. This study examines longitudinal, bidirectional relationships between work characteristics and sleep problems. Prospective cohort/two-wave panel. Sweden. 3065 working men and women approximately representative of the Swedish workforce who responded to the 2006 and 2008 waves of the Swedish Longitudinal Occupational Survey of Health (SLOSH). N/A. Bidirectional relationships between, on the one hand, workplace demands, decision authority, and support, and, on the other hand, sleep disturbances (reflecting lack of sleep continuity) and awakening problems (reflecting feelings of being insufficiently restored), were investigated by structural equation modeling. All factors were modeled as latent variables and adjusted for gender, age, marital status, education, alcohol consumption, and job change. Concerning sleep disturbances, the best fitting models were the "forward" causal model for demands and the "reverse" causal model for support. Regarding awakening problems, reciprocal models fitted the data best. Cross-lagged analyses indicates a weak relationship between demands at Time 1 and sleep disturbances at Time 2, a "reverse" relationship from support T1 to sleep disturbances T2, and bidirectional associations between work characteristics and awakening problems. In contrast to an earlier study on demands, control, sleep quality, and fatigue, this study suggests reverse and reciprocal in addition to the commonly hypothesized causal relationships between work characteristics and sleep problems based on a 2-year time lag.

Characterizing Longitudinal Patterns of Physical Activity in Mid-Adulthood Using Latent Class Analysis: Results From a Prospective Cohort Study

PubMed Central

Silverwood, Richard J.; Nitsch, Dorothea; Pierce, Mary; Kuh, Diana; Mishra, Gita D.

2011-01-01

The authors aimed to describe how longitudinal patterns of physical activity during mid-adulthood (ages 31–53 years) can be characterized using latent class analysis in a population-based birth cohort study, the Medical Research Council’s 1946 National Survey of Health and Development. Three different types of physical activity—walking, cycling, and leisure-time physical activity—were analyzed separately using self-reported data collected from questionnaires between 1977 and 1999; 3,847 study members were included in the analysis for one or more types of activity. Patterns of activity differed by sex, so stratified analyses were conducted. Two walking latent classes were identified representing low (52.8% of males in the cohort, 33.5% of females) and high (47.2%, 66.5%) levels of activity. Similar low (91.4%, 82.1%) and high (8.6%, 17.9%) classes were found for cycling, while 3 classes were identified for leisure-time physical activity: “low activity” (46.2%, 48.2%), “sports and leisure activity” (31.0%, 35.3%), and “gardening and do-it-yourself activities” (22.8%, 16.5%). The classes were reasonably or very well separated, with the exception of walking in females. Latent class analysis was found to be a useful tool for characterizing longitudinal patterns of physical activity, even when the measurement instrument differs slightly across ages, which added value in comparison with observed activity at a single age. PMID:22074812

Longitudinal aerodynamic characteristics of light, twin-engine, propeller-driven airplanes

NASA Technical Reports Server (NTRS)

Wolowicz, C. H.; Yancey, R. B.

1972-01-01

Representative state-of-the-art analytical procedures and design data for predicting the longitudinal static and dynamic stability and control characteristics of light, propeller-driven airplanes are presented. Procedures for predicting drag characteristics are also included. The procedures are applied to a twin-engine, propeller-driven airplane in the clean configuration from zero lift to stall conditions. The calculated characteristics are compared with wind-tunnel and flight data. Included in the comparisons are level-flight trim characteristics, period and damping of the short-period oscillatory mode, and windup-turn characteristics. All calculations are documented.

Pre-Quaternary divergence and subsequent radiation explain longitudinal patterns of genetic and morphological variation in the striped skink, Heremites vittatus.

PubMed

Baier, Felix; Schmitz, Andreas; Sauer-Gürth, Hedwig; Wink, Michael

2017-06-09

Many animal and plant species in the Middle East and northern Africa have a predominantly longitudinal distribution, extending from Iran and Turkey along the eastern Mediterranean coast into northern Africa. These species are potentially characterized by longitudinal patterns of biological diversity, but little is known about the underlying biogeographic mechanisms and evolutionary timescales. We examined these questions in the striped skink, Heremites vittatus, one such species with a roughly longitudinal distribution across the Middle East and northern Africa, by analyzing range-wide patterns of mitochondrial DNA (mtDNA) sequence and multi-trait morphological variation. The striped skink exhibits a basic longitudinal organization of mtDNA diversity, with three major mitochondrial lineages inhabiting northern Africa, the eastern Mediterranean coast, and Turkey/Iran. Remarkably, these lineages are of pre-Quaternary origin, and are characterized by p-distances of 9-10%. In addition, within each of these lineages a more recent Quaternary genetic diversification was observed, as evidenced by deep subclades and high haplotype diversity especially in the Turkish/Iranian and eastern Mediterranean lineages. Consistent with the genetic variation, our morphological analysis revealed that the majority of morphological traits show significant mean differences between specimens from northern Africa, the eastern Mediterranean coast, and Turkey/Iran, suggesting lineage-specific trait evolution. In addition, a subset of traits exhibits clinal variation along the eastern Mediterranean coast, potentially indicating selection gradients at the geographic transition from northern Africa to Anatolia. The existence of allopatric, morphologically and genetically divergent lineages suggests that Heremites vittatus might represent a complex with several taxa. Our work demonstrates that early divergence events in the Pliocene, likely driven by both climatic and geological factors, established the longitudinal patterns and distribution of Heremites vittatus. Subsequent radiation during the Pleistocene generated the genetic and morphological diversity observed today. Our study provides further evidence that longitudinal diversity patterns and species distributions in the Middle East and northern Africa were shaped by complex evolutionary processes, involving the region's intricate geological history, climatic oscillations, and the presence of the Sahara.

Cognitive-behavioral longitudinal assessment in ALS: the Italian Edinburgh Cognitive and Behavioral ALS screen (ECAS).

PubMed

Poletti, Barbara; Solca, Federica; Carelli, Laura; Faini, Andrea; Madotto, Fabiana; Lafronza, Annalisa; Monti, Alessia; Zago, Stefano; Ciammola, Andrea; Ratti, Antonia; Ticozzi, Nicola; Abrahams, Sharon; Silani, Vincenzo

2018-08-01

The study presents data on the longitudinal administration of the Italian Edinburgh Cognitive and Behavioral ALS Screen (ECAS). We investigated cognitive-behavioral performance in a group of ALS patients over time and the feasibility of repeating the ECAS longitudinally compared with standard neuropsychological tests. Finally, correlations between clinical/genetic and cognitive/behavioral data were considered. One hundred and sixty-eight ALS patients were tested at baseline (T 0 ). Among these, 48 patients performed the ECAS after 6 months (T 1 ), 18 patients performed it at T 2 (12 months), and five patients were assessed after 24 months (T 3 ). Participants were also administered two cognitive test (FAB; MoCA) and psychological questionnaires (BDI; STAI/Y). The FBI was carried out with caregivers. No cognitive deterioration was found across follow-ups. In contrast, although scores did not change between T 0 and T 1 , scores improved significantly for ECAS Total/ALS Non-specific and Memory domains when the ECAS was repeated on three occasions (T 0 , T 1 , T 2 ). Apathy/Inertia was the most common behavioral symptom, but no worsening of behavioral scores was detected over time. After 12-24 months, patients were still able to perform the ECAS in total, in contrast to FAB and MoCA, which were only partially administrable. The significant improvement of some ECAS scores over time supports the presence of possible practice effects, particularly in the memory domain, highlighting the need to accommodate for these in longitudinal assessments, through healthy controls groups or alternate versions. This work represents the first Italian ECAS follow-up study and confirms ECAS feasibility in patients with increasing physical disability.

Longitudinal evaluation of milk type consumed and weight status in preschoolers.

PubMed

Scharf, Rebecca J; Demmer, Ryan T; DeBoer, Mark D

2013-05-01

To evaluate relationships between type of milk consumed and weight status among preschool children. Longitudinal cohort study. The Early Childhood Longitudinal Study, Birth Cohort, a representative sample of US children. 10 700 US children examined at age 2 and 4 years. Body mass index (BMI) z score and overweight/obese status as a function of milk type intake. The majority of children drank whole or 2% milk (87% at 2 years, 79.3% at 4 years). Across racial/ethnic and socio-economic status subgroups, 1%/skim milk drinkers had higher BMI z scores than 2%/whole milk drinkers. In multivariable analyses, increasing fat content in the type of milk consumed was inversely associated with BMI z score (p<0.0001). Compared to those drinking 2%/whole milk, 2- and 4-year-old children drinking 1%/skim milk had an increased adjusted odds of being overweight (age 2 OR 1.64, p<0.0001; age 4 OR 1.63, p<0.0001) or obese (age 2 OR 1.57, p<0.01; age 4 OR 1.64, p<0.0001). In longitudinal analysis, children drinking 1%/skim milk at both 2 and 4 years were more likely to become overweight/obese between these time points (adjusted OR 1.57, p<0.05). Consumption of 1%/skim milk is more common among overweight/obese preschoolers, potentially reflecting the choice of parents to give overweight/obese children low-fat milk to drink. Nevertheless, 1%/skim milk does not appear to restrain body weight gain between 2 and 4 years of age in this age range, emphasising a need for weight-targeted recommendations with a stronger evidence base.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Klimenov, V. A., E-mail: klimenov@tpu.ru; National Research Tomsk Polytechnic University, 30 Lenin Av., Tomsk, 634050; Kurgan, K. A., E-mail: kirill-k2.777@mail.ru

The structure of weld joints of the titanium alloy Ti-6Al-4V in the initial ultrafine-grained state, obtained by resistance spot welding, is studied using the optical and scanning electron microscopy method and the X-ray structure analysis. The carried out studies show the relationship of the metal structure in the weld zone with main joint zones. The structure in the core zone and the heat affected zone is represented by finely dispersed grains of needle-shaped martensite, differently oriented in these zones. The change in the microhardness in the longitudinal section of the weld joint clearly correlates with structural changes during welding.

Sexism and gender inequality across 57 societies.

PubMed

Brandt, Mark J

2011-11-01

Theory predicts that individuals' sexism serves to exacerbate inequality in their society's gender hierarchy. Past research, however, has provided only correlational evidence to support this hypothesis. In this study, I analyzed a large longitudinal data set that included representative data from 57 societies. Multilevel modeling showed that sexism directly predicted increases in gender inequality. This study provides the first evidence that sexist ideologies can create gender inequality within societies, and this finding suggests that sexism not only legitimizes the societal status quo, but also actively enhances the severity of the gender hierarchy. Three potential mechanisms for this effect are discussed briefly.

Young adult outcomes of children growing up with chronic illness: an analysis of the National Longitudinal Study of Adolescent Health.

PubMed

Maslow, Gary R; Haydon, Abigail A; Ford, Carol Ann; Halpern, Carolyn Tucker

2011-03-01

To examine young adult outcomes in a nationally representative US cohort of young adults growing up with a chronic illness. Secondary analysis of nationally representative data from wave III (in 2001) of the National Longitudinal Study of Adolescent Health. United States. The analytic sample comprised 13 236 young adults aged 18 to 28 years at wave III. Self-report of a chronic physical illness (asthma, cancer, diabetes mellitus, or epilepsy) in adolescence. Respondents with asthma or nonasthmatic chronic illness (cancer, diabetes mellitus, or epilepsy) were compared with individuals without these conditions. Self-report of high school graduation, ever having employment, currently having employment, living with a parent/guardian, and ever receiving public assistance. Three percent of young adults had nonasthmatic chronic illness (cancer, diabetes, or epilepsy), and 16.0% had asthma. Most young adults with chronic illness graduated high school (81.3%) and currently had employment (60.4%). However, compared with healthy young adults, those with nonasthmatic chronic illness were significantly less likely to graduate high school, ever have had employment, or currently have employment and were more likely to receive public assistance. Compared with young adults with asthma, those with nonasthmatic chronic illness again had significantly worse young adult outcomes on all measures. Most young adults growing up with a chronic illness graduate high school and have employment. However, these young adults are significantly less likely than their healthy peers to achieve these important educational and vocational milestones.

The effects of bedtime and sleep duration on academic and emotional outcomes in a nationally representative sample of adolescents.

PubMed

Asarnow, Lauren D; McGlinchey, Eleanor; Harvey, Allison G

2014-03-01

The overall aim of this study was to clarify and better characterize the sleep/circadian patterns of adolescents in a nationally representative sample. We used three waves of data from the National Longitudinal Study of Adolescent Health to assess sleep/circadian patterns of 2,700 adolescents in grades seven through 12. Late school year bedtime was associated with shorter total sleep time cross-sectionally, whereas late summertime bedtime was not. Moreover, late school year bedtime was not associated with late summertime bedtime cross-sectionally. Late school year bedtime in Wave I (1994-1995) was associated with worse educational outcomes and emotional distress 6-8 years later. In addition, late summertime bedtime in Wave II (1996) was associated with more emotional distress at Wave III (2001-2002). Short total sleep time was not associated longitudinally with changes in emotional and academic functioning. Across Waves I and II, more than three quarters of adolescents who went to sleep at 11:15 a.m. or later during the school year or 1:30 a.m. or later during the summer reported sleeping fewer than the recommended 9 hours. These findings underscore the significance of evaluating and monitoring bedtime in adolescents and the importance of intervention strategies that target bedtimes in an effort to reduce associated functional impairments, and improve academic and emotional outcomes. Copyright © 2014 Society for Adolescent Health and Medicine. Published by Elsevier Inc. All rights reserved.

Adolescent Risk Factors for Child Maltreatment

PubMed Central

Matsuda, Mauri; Greenman, Sarah J.; Augustyn, Megan Bears; Henry, Kimberly L.; Smith, Carolyn A.; Ireland, Timothy O.

2014-01-01

We investigate adolescent risk factors, measured at both early and late adolescence, for involvement in child maltreatment during adulthood. Comprehensive assessments of risk factors for maltreatment that use representative samples with longitudinal data are scarce and can inform multilevel prevention. We use data from the Rochester Youth Development Study, a longitudinal study begun in 1988 with a sample of 1,000 seventh and eighth graders. Participants have been interviewed 14 times and, at the last assessment (age 31), 80% were retained. Risk factors represent 10 developmental domains: area characteristics, family background/structure, parent stressors, exposure to family violence, parent-child relationships, education, peer relationships, adolescent stressors, antisocial behaviors, and precocious transitions to adulthood. Maltreatment is measured by substantiated reports from Child Protective Services records. Many individual risk factors (20 at early adolescence and 14 at later adolescence) are significantly, albeit moderately, predictive of maltreatment. Several developmental domains stand out, including family background/structure, education, antisocial behaviors, and precocious transitions. In addition, there is a pronounced impact of cumulative risk on the likelihood of maltreatment. For example, only 3% of the youth with no risk domains in their background at early adolescence were involved in later maltreatment, but for those with risk in 9 developmental domains the rate was 45%. Prevention programs targeting youth at high risk for engaging in maltreatment should begin during early adolescence when risk factors are already at play. These programs need to be comprehensive, capable of addressing the multiple and interwoven nature of risk that is associated with maltreatment. PMID:24075569

Heart and skeletal muscle inflammation (HSMI) disease diagnosed on a British Columbia salmon farm through a longitudinal farm study

PubMed Central

Ferguson, Hugh W.; Schulze, Angela D.; Kaukinen, Karia H.; Li, Shaorong; Vanderstichel, Raphaël; Wessel, Øystein; Rimstad, Espen; Gardner, Ian A.; Hammell, K. Larry; Miller, Kristina M.

2017-01-01

Heart and skeletal muscle inflammation (HSMI) is an emerging disease of marine-farmed Atlantic Salmon (Salmo salar), first recognized in 1999 in Norway, and later also reported in Scotland and Chile. We undertook a longitudinal study involving health evaluation over an entire marine production cycle on one salmon farm in British Columbia (Canada). In previous production cycles at this farm site and others in the vicinity, cardiac lesions not linked to a specific infectious agent or disease were identified. Histologic assessments of both live and moribund fish samples collected at the farm during the longitudinal study documented at the population level the development, peak, and recovery phases of HSMI. The fish underwent histopathological evaluation of all tissues, Twort’s Gram staining, immunohistochemistry, and molecular quantification in heart tissue of 44 agents known or suspected to cause disease in salmon. Our analysis showed evidence of HSMI histopathological lesions over an 11-month timespan, with the prevalence of lesions peaking at 80–100% in sampled fish, despite mild clinical signs with no associated elevation in mortalities reported at the farm level. Diffuse mononuclear inflammation and myodegeneration, consistent with HSMI, was the predominant histologic observation in affected heart and skeletal muscle. Infective agent monitoring identified three agents at high prevalence in salmon heart tissue, including Piscine orthoreovirus (PRV), and parasites Paranucleospora theridion and Kudoa thyrsites. However, PRV alone was statistically correlated with the occurrence and severity of histopathological lesions in the heart. Immunohistochemical staining further localized PRV throughout HSMI development, with the virus found mainly within red blood cells in early cases, moving into the cardiomyocytes within or, more often, on the periphery of the inflammatory reaction during the peak disease, and reducing to low or undetectable levels later in the production cycle. This study represents the first longitudinal assessment of HSMI in a salmon farm in British Columbia, providing new insights on the pathogenesis of the disease. PMID:28225783

Aftermath of Terror: A Nationwide Longitudinal Study of Posttraumatic Stress and Worry Across the Decade Following the September 11, 2001 Terrorist Attacks.

PubMed

Garfin, Dana Rose; Poulin, Michael J; Blum, Scott; Silver, Roxane Cohen

2018-02-01

Research conducted in the early years after the September 11, 2001 (9/11) terrorist attacks in New York, Pennsylvania, and Washington, DC demonstrated adverse psychological outcomes among residents of the United States who were exposed to the attacks both directly and indirectly via the media. However, less is known about the impact of this collective trauma over time. Beginning at the end of December 2006, a longitudinal study of a nationally representative sample of U.S. residents (Cohort 2, N = 1,613) examined the long-term effects of 9/11, with annual assessments administered every year for 3 years. We assessed rates of 9/11-related posttraumatic stress (PTS) annually during the first 2 years of the study; during the second and third years of the study, we assessed fear and worry regarding future terrorism. Rates of PTS among participants were compared with those assessed annually in a nationally representative sample between 2002 and 2004 (Cohort 1); results indicated a relatively stable pattern of 9/11-related PTS symptoms for 6 years following the attacks. Five to six years after 9/11, we found an association between 9/11-related PTS and both direct, B = 8.45, 95% CI [4.32, 12.59] and media-based (live television), B = 1.78, 95% CI [0.90, 2.65] exposure to the attacks. Six to 7 years post-9/11, fear and worry regarding future terrorism were predicted by 9/11-related PTS symptoms that had been reported approximately 5 years after the attacks, B = 0.04, 95% CI [0.03, 0.05]. The psychological legacy of 9/11 was perceptible among many U.S. residents throughout the decade that followed. Copyright © 2018 International Society for Traumatic Stress Studies.

Prevalence and correlates of unhealthy weight control behaviors: findings from the national longitudinal study of adolescent health

PubMed Central

2014-01-01

Background A recent study examined the prevalence, clinical correlates, age trends, and stability of unhealthy weight control behaviors (UWCB; purging and diet pill use) in a nationally representative sample of Norwegian boys and girls. The purpose of this study was to provide similar, comparative analyses for a nationally representative sample of American youth. Methods Data were extracted from the restricted use data files of survey Waves I, II, and III of the National Longitudinal Study of Adolescent Health (Add Health), selecting all participants who at Wave I had provided information on age, sex, and UWCB. Using UWCB information, three groups were created (purging, diet pill use, and no recent UWCB “controls”) and compared on indicators of adverse health or mental health. Results Girls consistently were more likely than boys to report UWCB. UWCB were significantly associated with higher body mass index, self-perception of being overweight, low self-esteem, depression, and delinquency. Prevalence estimates for purging remained relatively constant across the three survey waves; in contrast, diet pill use was especially common at Wave III. Conclusions Age trends, gender differences, and clinical correlates of change in the likelihood of UWCB between Waves I-III were all identified in analyses comparing purging and diet pill use in American adolescents. Females and older adolescents were specifically more likely to engage in pill use than purging, and individuals with increased weight dissatisfaction, a history of delinquent behaviors, more depression symptoms, or lower self-esteem were more likely to engage in an unhealthy weight control behavior over time. While the Norwegian study found that prevalence of purging was lower among young adult participants, our results suggested that there were no significant differences in prevalence between age groups. PMID:24940509

Recruitment via the Internet and social networking sites: the 1989-1995 cohort of the Australian Longitudinal Study on Women's Health.

PubMed

Mishra, Gita Devi; Hockey, Richard; Powers, Jennifer; Loxton, Deborah; Tooth, Leigh; Rowlands, Ingrid; Byles, Julie; Dobson, Annette

2014-12-15

Faced with the challenge of recruiting young adults for health studies, researchers have increasingly turned to the Internet and social networking sites, such as Facebook, as part of their recruitment strategy. As yet, few large-scale studies are available that report on the characteristics and representativeness of the sample obtained from such recruitment methods. The intent of the study was to describe the sociodemographic and health characteristics of a national sample of young Australian women recruited mainly through the Internet and social networking sites and to discuss the representativeness of their sociodemographic, health, and lifestyle characteristics relative to the population. A cohort of 17,069 women (born between 1989 and 1995) was recruited in 2012-13 for the Australian Longitudinal Study on Women's Health. Sociodemographic characteristics (percentages, means, and 95% confidence intervals) from the online survey data were compared with women aged 18-23 years from the 2011 Australian Census. Sample data were compared by age and education level with data from the 2011-13 Australian Health Survey (AHS). Compared to the Australian Census data, study participants were broadly representative in terms of geographical distribution across Australia, marital status (95.62%, 16,321/17,069) were never married), and age distribution. A higher percentage had attained university (22.52%, 3844/17,069) and trade/certificate/diploma qualifications (25.94%, 4428/17,069) compared with this age group of women in the national population (9.4% and 21.7% respectively). Among study participants, 22.05% (3721/16,877) were not in paid employment with 35.18% (5931/16,857) studying 16 or more hours a week. A higher percentage of study participants rated their health in the online survey as fair or poor (rather than good, very good, or excellent) compared with those participating in face-to-face interviews in the AHS (18.77%, 3203/17,069 vs 10.1%). A higher percentage of study participants were current smokers (21.78%, 3718/17,069 vs 16.4%) and physically active (59.30%, 10,089/17,014 were classified as sufficiently active vs 48.3%) but alcohol consumption was lower (59.58%, 9865/16,558 reported drinking alcohol at least once per month vs 65.9% in the AHS). Using self-reported height and weight to determine body mass index (BMI, kg/m(2)), 34.80% (5901/16,956) of the cohort were classified as overweight or obese (BMI of 25 or more), compared with 33.6% respectively using measured height and weight in the AHS. Findings indicated that using the Internet and social networking sites for an online survey represent a feasible recruitment strategy for a national cohort of young women and result in a broadly representative sample of the Australian population.

PCA and vTEC climatology at midnight over mid-latitude regions

NASA Astrophysics Data System (ADS)

Natali, M. P.; Meza, A.

2017-12-01

The effect of the thermospheric vertical neutral wind on vertical total electron content (vTEC) variations including longitudinal anomaly, remaining winter anomaly, mid-latitude summer night anomaly, and semiannual anomaly is studied at mid-latitude regions around zero magnetic declination at midnight during high solar activity. By using the principal component analysis (PCA) numerical technique, this work studies the spatial and temporal variations of the ionosphere at midnight over mid-latitude regions during 2000-2002. PCA is applied to a time series of global vTEC maps produced by the International Global Navigation Satellite System (GNSS) Service. Four regions were studied in particular, each located at mid-latitude and approximately centered at zero magnetic declination, with two in the northern hemisphere and two in southern hemisphere, and all are located near and far from geomagnetic poles in each case. This technique provides an effective method to analyze the main ionospheric variabilities at mid-latitudes. PCA is also applied to the vTEC computed using the International Reference Ionosphere (IRI) 2012 model, to analyze the capability of this model to represent ionospheric variabilities at mid-latitude. Also, the Horizontal Wind Model 2007 (HWM07) is used to improve our climatology interpretation, by analyzing the relationship between vTEC and thermospheric wind, both quantitatively and qualitatively. At midnight, the behavior of mean vTEC values strongly responds to vertical wind variation, experiencing a decrease of about 10-15% with the action of the positive vertical component of the field-aligned neutral wind lasting for 2 h in all regions except for Oceania. Notable results include: a significant increase toward higher latitudes during summer in the South America and Asia regions, associated with the mid-latitude summer night anomaly, and an increase toward higher latitudes in winter in the North America and Oceania regions, highlighting the remnant effect of the winter anomaly. Finally, the longitudinal variations of east-west differences, named longitudinal anomaly, show maximum values in March for North America, in December for South America and Oceania, and are not shown for Asia. Our results show that at mid-latitudes regions, the IRI model represents midnight ionospheric mean values with a similar spatial distribution, but the values are always lower than those obtained by GNSS. The differences between IRI and GNSS results include: the longitudinal anomaly is characterized by a stronger semiannual variation in both North America and South America, with a maximum in the equinoxes, while for the Asian region, the behavior is almost constant throughout the years, and finally, there is an absence of the winter anomaly remnant.

14 CFR 25.321 - General.

Code of Federal Regulations, 2010 CFR

2010-01-01

... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false General. 25.321 Section 25.321 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... represent the ratio of the aerodynamic force component (acting normal to the assumed longitudinal axis of...

14 CFR 25.321 - General.

Code of Federal Regulations, 2013 CFR

2013-01-01

... 14 Aeronautics and Space 1 2013-01-01 2013-01-01 false General. 25.321 Section 25.321 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... represent the ratio of the aerodynamic force component (acting normal to the assumed longitudinal axis of...

14 CFR 25.321 - General.

Code of Federal Regulations, 2012 CFR

2012-01-01

... 14 Aeronautics and Space 1 2012-01-01 2012-01-01 false General. 25.321 Section 25.321 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... represent the ratio of the aerodynamic force component (acting normal to the assumed longitudinal axis of...

14 CFR 25.321 - General.

Code of Federal Regulations, 2011 CFR

2011-01-01

... 14 Aeronautics and Space 1 2011-01-01 2011-01-01 false General. 25.321 Section 25.321 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... represent the ratio of the aerodynamic force component (acting normal to the assumed longitudinal axis of...

14 CFR 25.321 - General.

Code of Federal Regulations, 2014 CFR

2014-01-01

... 14 Aeronautics and Space 1 2014-01-01 2014-01-01 false General. 25.321 Section 25.321 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS... represent the ratio of the aerodynamic force component (acting normal to the assumed longitudinal axis of...

Vibrational response analysis of tires using a three-dimensional flexible ring-based model

NASA Astrophysics Data System (ADS)

Matsubara, Masami; Tajiri, Daiki; Ise, Tomohiko; Kawamura, Shozo

2017-11-01

Tire vibration characteristics influence noise, vibration, and harshness. Hence, there have been many investigations of the dynamic responses of tires. In this paper, we present new formulations for the prediction of tire tread vibrations below 150 Hz using a three-dimensional flexible ring-based model. The ring represents the tread including the belt, and the springs represent the tire sidewall stiffness. The equations of motion for lateral, longitudinal, and radial vibration on the tread are derived based on the assumption of inextensional deformation. Many of the associated numerical parameters are identified from experimental tests. Unlike most studies of flexible ring models, which mainly discussed radial and circumferential vibration, this study presents steady response functions concerning not only radial and circumferential but also lateral vibration using the three-dimensional flexible ring-based model. The results of impact tests described confirm the theoretical findings. The results show reasonable agreement with the predictions.

Fractal dimension and lacunarity analysis of mammographic patterns in assessing breast cancer risk related to HRT treated population: a longitudinal and cross-sectional study

NASA Astrophysics Data System (ADS)

Karemore, Gopal; Nielsen, Mads

2009-02-01

Structural texture measures are used to address the aspect of breast cancer risk assessment in screening mammograms. The current study investigates whether texture properties characterized by local Fractal Dimension (FD) and Lacunarity contribute to asses breast cancer risk. FD represents the complexity while the Lacunarity characterize the gappiness of a fractal. Our cross-sectional case-control study includes mammograms of 50 patients diagnosed with breast cancer in the subsequent 2-4 years and 50 matched controls. The longitudinal double blind placebo controlled HRT study includes 39 placebo and 36 HRT treated volunteers for two years. ROIs with same dimension (250*150 pixels) were created behind the nipple region on these radiographs. Box counting method was used to calculate the fractal dimension (FD) and the Lacunarity. Paired t-test and Pearson correlation coefficient were calculated. It was found that there were no differences between cancer and control group for FD (P=0.8) and Lacunarity (P=0.8) in crosssectional study whereas earlier published heterogeneity examination of radiographs (BC-HER) breast cancer risk score separated groups (p=0.002). In the longitudinal study, FD decreased significantly (P<0.05) in the HRT treated population while Lacunarity remained insignificant (P=0.2). FD is negatively correlated to Lacunarity (-0.74, P<0.001), BIRADS (-0.34, P<0.001) and Percentage Density (-0.41, P<0.001). FD is invariant to the mammographic texture change from control to cancer population but marginally varying in HRT treated population. This study yields no evidence that lacunarity or FD are suitable surrogate markers of mammographic heterogeneity as they neither pick up breast cancer risk, nor show good sensitivity to HRT.

Longitudinal data analysis in support of functional stability concepts for leachate management at closed municipal landfills

DOE Office of Scientific and Technical Information (OSTI.GOV)

Gibbons, Robert D., E-mail: rdg@uchicago.edu; Morris, Jeremy W.F., E-mail: jmorris@geosyntec.com; Prucha, Christopher P., E-mail: cprucha@wm.com

2014-09-15

Highlights: • Longitudinal data analysis using a mixed-effects regression model. • Dataset consisted of a total of 1402 samples from 101 closed municipal landfills. • Target analytes and classes generally showed predictable degradation trends. • Validates historical studies focused on macro organic indicators such as BOD. • BOD can serve as “gateway” indicator for planning leachate management. - Abstract: Landfill functional stability provides a target that supports no environmental threat at the relevant point of exposure in the absence of active control systems. With respect to leachate management, this study investigates “gateway” indicators for functional stability in terms of themore » predictability of leachate characteristics, and thus potential threat to water quality posed by leachate emissions. Historical studies conducted on changes in municipal solid waste (MSW) leachate concentrations over time (longitudinal analysis) have concentrated on indicator compounds, primarily chemical oxygen demand (COD) and biochemical oxygen demand (BOD). However, validation of these studies using an expanded database and larger constituent sets has not been performed. This study evaluated leachate data using a mixed-effects regression model to determine the extent to which leachate constituent degradation can be predicted based on waste age or operational practices. The final dataset analyzed consisted of a total of 1402 samples from 101 MSW landfills. Results from the study indicated that all leachate constituents exhibit a decreasing trend with time in the post-closure period, with 16 of the 25 target analytes and aggregate classes exhibiting a statistically significant trend consistent with well-studied indicators such as BOD. Decreasing trends in BOD concentration after landfill closure can thus be considered representative of trends for many leachate constituents of concern.« less

Tracking and incentivizing substance abusers in longitudinal research: results of a survey of National Institute on Drug Abuse-funded investigators.

PubMed

Farabee, David; Hawken, Angela; Griffith, Peter

2011-06-01

Increased recognition that addictive behaviors tend to be chronic and relapsing has led to a growing emphasis on longitudinal substance abuse research. The purpose of this study was to identify effective follow-up strategies used by National Institute on Drug Abuse-funded investigators who have conducted at least 1 study involving follow-up data collection from human subjects. A web-based survey was administered to a representative sample of National Institute on Drug Abuse-funded researchers (N = 153) with a history of conducting longitudinal research. Reported study response rates were generally high, although 27% of the studies fell below the 80% benchmark. Face-to-face and telephone-based interviews commanded the largest subject payments-2 to 3 times higher than compensation rates for collection of biologic samples. With regard to the presumed impact of low follow-up rates on the generalizability of study findings, one-third of investigators who compared baseline characteristics of those who did and did not participate in the follow-up found meaningful differences. Support was found for the hypothesis that follow-up rates and total compensation would be positively related, with the mean compensation amounts between studies achieving <80% follow-up rate versus those achieving rates ≥80%, revealing a statistically significant effect in the predicted direction. The majority of respondents reported difficulty in tracking and locating subjects, and study respondents often proved to be quite different from nonrespondents. Incentives improved follow-up rates to a point, although the relationship was not linear. Efforts to improve follow-up rates may be better spent on addressing tracking and locating logistics rather than on strategies to compel participation once the subject has been located.

The Effects of Magnetic-field Geometry on Longitudinal Oscillaitons of Solar Prominences

NASA Technical Reports Server (NTRS)

Luna, M.; Diaz, A. J.; Karpen, J.

2013-01-01

We investigate the influence of the geometry of the solar filament magnetic structure on the large-amplitude longitudinal oscillations. A representative filament flux tube is modeled as composed of a cool thread centered in a dipped part with hot coronal regions on either side.We have found the normal modes of the system and establish that the observed longitudinal oscillations are well described with the fundamental mode. For small and intermediate curvature radii and moderate to large density contrast between the prominence and the corona, the main restoring force is the solar gravity. In this full wave description of the oscillation a simple expression for the oscillation frequencies is derived in which the pressure-driven term introduces a small correction. We have also found that the normal modes are almost independent of the geometry of the hot regions of the tube. We conclude that observed large-amplitude longitudinal oscillations are driven by the projected gravity along the flux tubes and are strongly influenced by the curvature of the dips of the magnetic field in which the threads reside.

Dynamic thresholds and a summary ROC curve: Assessing prognostic accuracy of longitudinal markers.

PubMed

Saha-Chaudhuri, P; Heagerty, P J

2018-04-19

Cancer patients, chronic kidney disease patients, and subjects infected with HIV are routinely monitored over time using biomarkers that represent key health status indicators. Furthermore, biomarkers are frequently used to guide initiation of new treatments or to inform changes in intervention strategies. Since key medical decisions can be made on the basis of a longitudinal biomarker, it is important to evaluate the potential accuracy associated with longitudinal monitoring. To characterize the overall accuracy of a time-dependent marker, we introduce a summary ROC curve that displays the overall sensitivity associated with a time-dependent threshold that controls time-varying specificity. The proposed statistical methods are similar to concepts considered in disease screening, yet our methods are novel in choosing a potentially time-dependent threshold to define a positive test, and our methods allow time-specific control of the false-positive rate. The proposed summary ROC curve is a natural averaging of time-dependent incident/dynamic ROC curves and therefore provides a single summary of net error rates that can be achieved in the longitudinal setting. Copyright © 2018 John Wiley & Sons, Ltd.

Gestational weight gain and predicted changes in offspring anthropometrics between early infancy and 3 years

PubMed Central

Deierlein, Andrea L.; Siega-Riz, Anna Maria; Herring, Amy H.; Adair, Linda S.; Daniels, Julie L.

2011-01-01

Objective To determine how gestational weight gain (GWG), categorized using the 2009 Institute of Medicine recommendations, relates to changes in offspring weight-for-age (WAZ), length-for-age (LAZ), and weight-for-length z-scores (WLZ) between early infancy and 3 years. Methods Women with singleton infants were recruited from the third cohort of the Pregnancy, Infection, and Nutrition Study (2001-2005). Term infants with at least one weight or length measurement during the study period were included (n=476). Multivariable linear mixed effects regression models estimated longitudinal changes in WAZ, LAZ, and WLZ associated with GWG. Results In early infancy, compared to infants of women with adequate weight gain, those of women with excessive weight gains had higher WAZ, LAZ, and WLZ. Excessive GWG≥200% of the recommended amount was associated with faster rates of change in WAZ and LAZ and noticeably higher predicted mean WAZ and WLZ that persisted across the study period. Conclusions GWG represents a modifiable behavioral factor that is associated with offspring anthropometric outcomes. More longitudinal studies that utilize maternal and pediatric body composition measures are necessary to understand the nature of this association. PMID:22434753

A Longitudinal Examination of 10-year Change in Vocational and Educational Activities for Adults with Autism Spectrum Disorders

PubMed Central

Taylor, Julie Lounds; Center, Vanderbilt Kennedy; Mailick, Marsha R.

2014-01-01

The transition from adolescence to adulthood has been shown to be a time of amplified risk for individuals with autism spectrum disorders (ASD). It is unknown, however, whether problems in educational attainment and employment in the years after high school exit represent “momentary perturbations” in development or a “turning point” with long-lasting effects throughout adulthood. The present study addressed this question by examining 10-year trajectories of vocational and educational activities for adults with ASD, as well as the personal characteristics and environmental resources that predicted these activities. Participants were 161 adults with ASD (ages 18-52 at the start of the study, M=30.9 years) who were part of a larger longitudinal study. Data were collected at 6 time points over a 10-year period. Results indicated significant declines in the level of independence and engagement in vocational/educational activities over the study period, particularly for women. Greater independence in vocational activities was found for those with more independence in activities of daily living. Net of personal characteristics, receipt of more services was marginally related to greater improvement in vocational independence. PMID:24001150

Composition and Longitudinal Patterns of Aquatic Insect Emergence in Small Rivers of Palawan Island, the Philippines

NASA Astrophysics Data System (ADS)

Freitag, Hendrik

2004-09-01

This study presents the first emergence trap samples from streams in the Philippines and Greater Sunda. Aquatic insect emergence from two small rivers and longitudinal patterns including estuaries are compared. A decline of total emergence towards estuaries was observed, affecting all major orders. Diptera, namely Chironomidae, dominated all sites. High abundances in Ceratopogonidae, Odonata, and Coleoptera were found, compared to other emergence studies from tropical and temperate latitudes. Ephemeroptera displayed a highly variable contribution to the emergence from Palawan as well as in other comparative studies either supported by the appropriate conditions for certain functional groups or limited by environmental variables such as pH. Trichoptera are likely to tolerate a wider range of environmental conditions and they are consequently able to fill further niches where Ephemeroptera are under-represented. Except for scarce abundances of Plecoptera observed in this and other studies from the tropics, no substantial differences in emergence composition at order level existed between temperate and tropical rivers, however, with a remarkable local variation. Components of riparian and non-aquatic insects and non-emergent fauna contributing to the collections are discussed based on trap features. (

Frequencies and predictors of barriers to mental health service use: a longitudinal study of Hurricane Ike survivors.

PubMed

Lowe, Sarah R; Fink, David S; Norris, Fran H; Galea, Sandro

2015-01-01

The majority of disaster survivors suffering from psychological symptoms do not receive mental health services. Research on barriers to service use among disaster survivors is limited by a lack of longitudinal studies of representative samples and investigations of predictors of barriers. The purpose of this study was to address these limitations through analysis of a three-wave population-based study of Hurricane Ike survivors (N = 658). Frequencies of preference, outcome expectancy, resource, and stigma barriers among participants with unmet mental health needs were documented and logistic regression using a generalized estimating equations approach explored predisposing (e.g., age), illness-related (e.g., posttraumatic stress) and enabling (e.g., insurance coverage) factors as predictors of each type of barrier. Preference barriers were most frequently cited at each wave, whereas stigma barriers were least frequently cited. Older age and higher emotional support predicted preference barriers; being a parent of a child under 18-years old at the time of the hurricane, higher generalized anxiety, and lack of insurance predicted resource barriers; and higher posttraumatic stress predicted stigma barriers. These findings suggest that postdisaster practices targeting subpopulations most likely to have barriers to service use may be indicated.

Community Engagement in Epidemiological Research

PubMed Central

Sapienza, Jessica N.; Corbie-Smith, Giselle; Keim, Sarah; Fleischman, Alan R.

2007-01-01

Objectives Engaging communities has become a critical aspect of planning and implementing health research. The role community engagement should play in epidemiological and observational research remains unclear since much of this research is not directly generated by community concerns and is not interventional in nature. The National Children's Study (NCS), an observational longitudinal study of 100,000 children and their families, provides a model to help guide the development of community engagement strategies in epidemiologic research. Methodology This manuscript describes community engagement activities of the NCS during the planning phases of the study. Results There are many challenges of community engagement in epidemiologic research particularly before the actual research sites are determined. After communities of interest are designated many further issues must be resolved, including: defining the specific community, determining which residents or institutions represent the identified community, and developing trust and rapport through respectful engagement. Conclusions Community engagement is critical to the long-term success of any longitudinal epidemiologic study. A partnership with the community should be formed to ensure mutual respect and the establishment of an enduring relationship. Genuine community engagement offers the hope of enhancing recruitment, retention, and participant satisfaction. PMID:17512886

Occupational mortality of women aged 15-59 years at death in England and Wales.

PubMed Central

Moser, K A; Goldblatt, P O

1991-01-01

STUDY OBJECTIVE--The aim was to analyse occupational mortality differences among women using follow up data from a large nationally representative sample. DESIGN--Occupational information was obtained from the 1971 census records of women in the Longitudinal Study carried out by the Office of Population Censuses and Surveys (OPCS) and related to their subsequent mortality in the period between the 1971 and 1981 censuses. SETTING--In the Longitudinal Study, census, vital statistics, and other OPCS records are linked for a 1% sample of the population of England and Wales. The women studied in this paper were drawn from the 513,071 persons in the 1971 census who were included in the Longitudinal Study and whose entries were traced at the National Health Service Central Register by 1977. PARTICIPANTS--The analysis was based on 77,081 women aged 15-59 years in the Longitudinal Study for whom occupational information was collected in the 1971 census (99% of whom were in paid employment in the week before the census). There were 1553 deaths among these women in the follow up period analysed here. MEASUREMENTS AND MAIN RESULTS--Numbers of deaths in each occupational group at census were compared to those expected on the basis of age specific death rates among all women in the study. "Professional, technical workers, and artists" had significantly low mortality while "Engineering and allied trades workers nec" had significantly high mortality. Among the latter, cancer mortality of electrical production process workers was extremely high. A number of other cause specific associations (which appear to confirm proportionate Decennial Supplement analyses) were suggested by the data; examples include high levels of mortality from ischaemic heart disease among cooks, lung cancer and respiratory disease among charwomen and cleaners, and accidents, poisonings, and violence among several groups of professional and technical workers. CONCLUSIONS--By using prospective follow up from the census, occupational differences in mortality can be identified among women in paid employment. As follow up of this study continues, numbers of deaths available for analysis will increase, allowing increasingly comprehensive analyses to be undertaken. PMID:2072070

Childhood Precursors of the Narcissistic Personality.

PubMed

Cramer, Phebe

2017-09-01

This research identifies the childhood personality characteristics that predict the presence of narcissism in adulthood. Using data from the longitudinal study of Block and Block (The California Child Q-set. Palo Alto, CA: Consulting Psychologists Press, 1980), childhood personality characteristics were assessed at age 11 (N = 100) using the California Child Q-set. A number of these were shown to differentially predict the presence of grandiose or vulnerable narcissism at age 23. Factor analyses of the Child Q-set items showed that the presence of Grandiose Narcissism was positively related to childhood factors representing social presence and negatively related to planfulness. In contrast, vulnerable narcissism was positively related to childhood impulsivity and negatively related to stable self-esteem. Both types of narcissism were positively related to childhood factors representing need for control.

The Effects of the Green House Nursing Home Model on ADL Function Trajectory: A Retrospective Longitudinal Study

PubMed Central

YOON, Ju Young; BROWN, Roger L.; BOWERS, Barbara J.; SHARKEY, Siobhan S.; HORN, Susan D.

2015-01-01

Background Growing attention in the past few decades has focused on improving care quality and quality of life for nursing home residents. Many traditional nursing homes have attempted to transform themselves to become more homelike emphasizing individualized care. This trend is referred to as nursing home culture change in the U.S. A promising culture change nursing home model, the Green House (GH) nursing home model, has shown positive psychological outcomes. However, little is known about whether the GH nursing home model has positive effects on physical function compared to traditional nursing homes. Objectives To examine the longitudinal effects of the GH nursing home model by comparing change patterns of ADL function over time between GH home residents and traditional nursing home residents. Design A retrospective longitudinal study. Settings Four GH organizations (nine GH units and four traditional units). Participants A total of 242 residents (93 GH residents and 149 traditional home residents) who had stayed in the nursing home at least six months from admission. Methods The outcome was ADL function, and the main independent variable was the facility type in which the resident stayed: a GH or traditional unit. Age, gender, comorbidity score, cognitive function, and depressive symptoms at baseline were controlled. All of these measures were from a minimum dataset. Growth curve modeling and growth mixture modeling were employed in this study for longitudinal analyses. Results The mean ADL function showed deterioration over time, and the rates of deterioration between GH and traditional home residents were not different over time. Four different ADL function trajectories were identified for 18 months, but there was no statistical difference in the likelihood of being in one of the four trajectory classes between the two groups. Conclusions Although GH nursing homes are considered to represent an innovative model changing the nursing home environment into more person-centered, this study did not demonstrate significant differences in ADL function changes for residents in the GH nursing homes compared to traditional nursing homes. Given that the GH model continues to evolve as it is being implemented and variations within and across GH homes are identified, large-scale longitudinal studies are needed to provide further relevant information on the effects of the GH model. PMID:26260709

Procrastination, Distress and Life Satisfaction across the Age Range - A German Representative Community Study.

PubMed

Beutel, Manfred E; Klein, Eva M; Aufenanger, Stefan; Brähler, Elmar; Dreier, Michael; Müller, Kai W; Quiring, Oliver; Reinecke, Leonard; Schmutzer, Gabriele; Stark, Birgit; Wölfling, Klaus

2016-01-01

Addressing the lack of population-based data the purpose of this representative study was to assess procrastination and its associations with distress and life satisfaction across the life span. A representative German community sample (1,350 women; 1,177 men) between the ages of 14 and 95 years was examined by the short form of the General Procrastination Scale (GPS-K; 1) and standardized scales of perceived stress, depression, anxiety, fatigue and life satisfaction. As hypothesized, procrastination was highest in the youngest cohort (14-29 years). Only in the youngest and most procrastinating cohort (aged 14 to 29 years), men procrastinated more than women. As we had further hypothesized, procrastination was consistently associated with higher stress, more depression, anxiety, fatigue and reduced satisfaction across life domains, especially regarding work and income. Associations were also found with lack of a partnership and unemployment. Findings are discussed with regard to potential developmental and cohort effects. While procrastination appears to be a pervasive indicator for maladjustment, longitudinal analyses in high-risk samples (e.g. late adolescence, unemployment) are needed to identify means and mechanisms of procrastinating.

Religiosity and the Impact of Religious Secondary Schooling

ERIC Educational Resources Information Center

Wadsworth, Allyssa A.; Walker, Jay K.

2017-01-01

Using a nationally representative longitudinal survey and incorporating propensity score matching methods, we follow secondary school students post-graduation to determine how Catholic and private religious schooling impacts religiosity. There is an established literature examining the Catholic school impact on collegiate and labor market…

Experiment-Based Teaching in Advanced Control Engineering

ERIC Educational Resources Information Center

Precup, R.-E.; Preitl, S.; Radac, M.-B.; Petriu, E. M.; Dragos, C.-A.; Tar, J. K.

2011-01-01

This paper discusses an experiment-based approach to teaching an advanced control engineering syllabus involving controlled plant analysis and modeling, control structures and algorithms, real-time laboratory experiments, and their assessment. These experiments are structured around the representative case of the longitudinal slip control of an…

Minorities Are Disproportionately Underrepresented in Special Education

ERIC Educational Resources Information Center

Morgan, Paul L.; Farkas, George; Hillemeier, Marianne M.; Mattison, Richard; Maczuga, Steve; Li, Hui; Cook, Michael

2015-01-01

We investigated whether minority children attending U.S. elementary and middle schools are disproportionately represented in special education. We did so using hazard modeling of multiyear longitudinal data and extensive covariate adjustment for potential child-, family-, and state-level confounds. Minority children were consistently less likely…

The persistent prevalence and evolution of cross-family recombinant coronavirus GCCDC1 among a bat population: a two-year follow-up.

PubMed

Obameso, Joseph O; Li, Hong; Jia, Hao; Han, Min; Zhu, Shiyan; Huang, Canping; Zhao, Yuhui; Zhao, Min; Bai, Yu; Yuan, Fei; Zhao, Honglan; Peng, Xia; Xu, Wen; Tan, Wenjie; Zhao, Yingze; Yuen, Kwok-Yung; Liu, William J; Lu, Lin; Gao, George F

2017-12-01

Bats are connected with the increasing numbers of emerging and re-emerging viruses that may break the species barrier and spread into the human population. Coronaviruses are one of the most common viruses discovered in bats, which were considered as the natural source of recent human-susceptible coronaviruses, i.e. SARS-COV and MERS-CoV. Our previous study reported the discovery of a bat-derived putative cross-family recombinant coronavirus with a reovirus gene p10, named as Ro-BatCoV GCCDC1. In this report, through a two-year follow-up of a special bat population in one specific cave of south China, we illustrate that Ro-BatCoV GCCDC1 persistently circulates among bats. Notably, through the longitudinal observation, we identified the dynamic evolution of Ro-BatCoV GCCDC1 in bats represented by continuously recombination events. Our study provides the first glimpse of the virus evolution in one longitudinally observed bat population cohort and underlines the surveillance and pre-warning of potential interspecies transmittable viruses in bats.

Longitudinal uniformity, time performances and irradiation test of pure CsI crystals

NASA Astrophysics Data System (ADS)

Angelucci, M.; Atanova, O.; Baccaro, S.; Cemmi, A.; Cordelli, M.; Donghia, R.; Giovannella, S.; Happacher, F.; Miscetti, S.; Sarra, I.; Soleti, S. R.

2016-07-01

To study an alternative to BaF2, as the crystal choice for the Mu2e calorimeter, 13 pure CsI crystals from Opto Materials and ISMA producers have been characterized by determining their light yield (LY) and longitudinal response uniformity (LRU), when read with a UV extended PMT. The crystals show a LY of 100 p.e./MeV ( 150 p.e./MeV) when wrapped with Tyvek and coupled to the PMT without (with) optical grease. The LRU is well represented by a linear slope that is on average δ -0.6%/cm. The timing performances of the Opto Materials crystal, read with a UV extended MPPC, have been evaluated with minimum ionizing particles. A timing resolution of 330 ps ( 440 ps) is achieved when connecting the photosensor to the MPPC with (without) optical grease. The crystal radiation hardness to a ionization dose has also been studied for one pure CsI crystal from SICCAS. After exposing it to a dose of 900 Gy, a decrease of 33% in the LY is observed while the LRU remains unchanged.

Anxiety in late adulthood: Associations with gender, education, and physical and cognitive functioning.

PubMed

Tetzner, Julia; Schuth, Morten

2016-08-01

Anxiety is common in late adulthood and can complicate adjustment in several areas. This study used data from 2 measurement points of a representative European longitudinal study (Survey of Health, Ageing, and Retirement in Europe) with a large sample size (N = 28,326) and a broad age range (45-90) to examine age effects on cross-sectional mean levels of anxiety as well as longitudinal mean-level changes over 2 years with respect to gender, education, and changes in physical and cognitive functioning. Furthermore, we analyzed generalizability of the findings for different European countries. Latent change models and locally weighted smoothing curves revealed 3 main findings: (1) Mean levels of anxiety were relatively stable over the course of middle adulthood and increased during late adulthood, (2) women and individuals with less education were more anxious than men and individuals with more education, and (3) increases in anxiety in late adulthood were associated with age-associated losses in physical and cognitive functioning. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

Emotional problems among recent immigrants and parenting status: Findings from a national longitudinal study of immigrants in Canada

PubMed Central

Browne, Dillon T.; Kumar, Aarti; Puente-Duran, Sofia; Georgiades, Katholiki; Leckie, George; Jenkins, Jennifer

2017-01-01

The present study examined predictors of emotional problems amongst a nationally representative cohort of recent immigrants in Canada. Specifically, the effects of parenting status were examined given the association between parenting stress and mental health. Data came from the Longitudinal Survey of Immigrants to Canada (N = 7055). Participants were recruited 6-months post landing (2001–2002) and followed up at 2 and 4 years. Self-reported emotional problems over time were considered as a function of parenting status (Two Parent, Lone Parent, Divorced Non-Parent, Non-Divorced Non-Parent) and sociodemographic characteristics. Odds of emotional problems were higher among Two Parent, OR = 1.12 (1.01, 1.24), Lone Parent, OR = 2.24 (1.75, 2.88), and Divorced Non-Parent, OR = 1.30 (1.01, 1.66) immigrants compared to Non-Divorced Non-Parents. Visible minority status, female gender, low income, and refugee status were associated with elevated risk. Findings reveal that immigrant parents are at risk for emotional health problems during the post-migration period. Such challenges may be compounded by other sociodemographic risk. PMID:28376118

Factors Associated with Positive Relationships between Stepfathers and Adolescent Stepchildren

PubMed Central

Thorsen, Maggie L.; Amato, Paul R.

2014-01-01

This study employs nationally representative data on adolescents and their stepfathers (n = 2085) from the National Longitudinal Study of Adolescent Health (Add Health) to examine factors associated with positive stepfather-stepchild relationships in married stepfamilies. Results reveal substantial variability in the perceived quality of adolescents’ relationships with stepfathers. Structural equation models using Wave I data reveal that close relationships with mothers and close ties between mothers and stepfathers are positively related to the perceived quality of adolescents’ relationships with stepfathers. Longitudinal models using Waves I and II do not yield definitive results but suggest that the direction of influence runs in both directions, with the mother-child relationship and the stepfather-stepchild relationship mutually reinforcing one another. We identify a number of other factors that are associated with positive stepfather-stepchild ties, as well as a few factors that may be less consequential than previously thought. Most of the correlates of positive stepfather-stepchild relationships are similar for boys and girls; for Whites, Blacks, and Hispanics; and for stepfamilies of various durations. PMID:24913942

Emotional problems among recent immigrants and parenting status: Findings from a national longitudinal study of immigrants in Canada.

PubMed

Browne, Dillon T; Kumar, Aarti; Puente-Duran, Sofia; Georgiades, Katholiki; Leckie, George; Jenkins, Jennifer

2017-01-01

The present study examined predictors of emotional problems amongst a nationally representative cohort of recent immigrants in Canada. Specifically, the effects of parenting status were examined given the association between parenting stress and mental health. Data came from the Longitudinal Survey of Immigrants to Canada (N = 7055). Participants were recruited 6-months post landing (2001-2002) and followed up at 2 and 4 years. Self-reported emotional problems over time were considered as a function of parenting status (Two Parent, Lone Parent, Divorced Non-Parent, Non-Divorced Non-Parent) and sociodemographic characteristics. Odds of emotional problems were higher among Two Parent, OR = 1.12 (1.01, 1.24), Lone Parent, OR = 2.24 (1.75, 2.88), and Divorced Non-Parent, OR = 1.30 (1.01, 1.66) immigrants compared to Non-Divorced Non-Parents. Visible minority status, female gender, low income, and refugee status were associated with elevated risk. Findings reveal that immigrant parents are at risk for emotional health problems during the post-migration period. Such challenges may be compounded by other sociodemographic risk.

Excitatory glutamate is essential for development and maintenance of the piloneural mechanoreceptor.

PubMed

Woo, Seung-Hyun; Baba, Yoshichika; Franco, Alexa M; Lumpkin, Ellen A; Owens, David M

2012-02-01

The piloneural collar in mammalian hairy skin comprises an intricate pattern of circumferential and longitudinal sensory afferents that innervate primary and secondary pelage hairs. The longitudinal afferents tightly associate with terminal Schwann cell processes to form encapsulated lanceolate nerve endings of rapidly adapting mechanoreceptors. The molecular basis for piloneural development, maintenance and function is poorly understood. Here, we show that Nefh-expressing glutamatergic neurons represent a major population of longitudinal and circumferential sensory afferents innervating the piloneural collar. Our findings using a VGLUT2 conditional-null mouse model indicate that glutamate is essential for innervation, patterning and differentiation of NMDAR(+) terminal Schwann cells during piloneural collar development. Similarly, treatment of adult mice with a selective NMDAR antagonist severely perturbed piloneural collar structure and reduced excitability of these mechanosensory neurons. Collectively, these results show that DRG-derived glutamate is essential for the proper development, maintenance and sensory function of the piloneural mechanoreceptor.

Genome-Level Longitudinal Expression of Signaling Pathways and Gene Networks in Pediatric Septic Shock

PubMed Central

Shanley, Thomas P; Cvijanovich, Natalie; Lin, Richard; Allen, Geoffrey L; Thomas, Neal J; Doctor, Allan; Kalyanaraman, Meena; Tofil, Nancy M; Penfil, Scott; Monaco, Marie; Odoms, Kelli; Barnes, Michael; Sakthivel, Bhuvaneswari; Aronow, Bruce J; Wong, Hector R

2007-01-01

We have conducted longitudinal studies focused on the expression profiles of signaling pathways and gene networks in children with septic shock. Genome-level expression profiles were generated from whole blood-derived RNA of children with septic shock (n = 30) corresponding to day one and day three of septic shock, respectively. Based on sequential statistical and expression filters, day one and day three of septic shock were characterized by differential regulation of 2,142 and 2,504 gene probes, respectively, relative to controls (n = 15). Venn analysis demonstrated 239 unique genes in the day one dataset, 598 unique genes in the day three dataset, and 1,906 genes common to both datasets. Functional analyses demonstrated time-dependent, differential regulation of genes involved in multiple signaling pathways and gene networks primarily related to immunity and inflammation. Notably, multiple and distinct gene networks involving T cell- and MHC antigen-related biology were persistently downregulated on both day one and day three. Further analyses demonstrated large scale, persistent downregulation of genes corresponding to functional annotations related to zinc homeostasis. These data represent the largest reported cohort of patients with septic shock subjected to longitudinal genome-level expression profiling. The data further advance our genome-level understanding of pediatric septic shock and support novel hypotheses. PMID:17932561

Analysis of longitudinal laboratory data in the presence of common selection mechanisms: a view toward greater emphasis on pre-marketing pharmaceutical safety.

PubMed

Schildcrout, Jonathan S; Jenkins, Cathy A; Ostroff, Jack H; Gillen, Daniel L; Harrell, Frank E; Trost, Donald C

2008-05-30

Pharmaceutical safety has received substantial attention in the recent past; however, longitudinal clinical laboratory data routinely collected during clinical trials to derive safety profiles are often used ineffectively. For example, these data are frequently summarized by comparing proportions (between treatment arms) of participants who cross pre-specified threshold values at some time during follow-up. This research is intended, in part, to encourage more effective utilization of these data by avoiding unnecessary dichotomization of continuous data, acknowledging and making use of the longitudinal follow-up, and combining data from multiple clinical trials. However, appropriate analyses require careful consideration of a number of challenges (e.g. selection, comparability of study populations, etc.). We discuss estimation strategies based on estimating equations and maximum likelihood for analyses in the presence of three response history-dependent selection mechanisms: dropout, follow-up frequency, and treatment discontinuation. In addition, because clinical trials' participants usually represent non-random samples from target populations, we describe two sensitivity analysis approaches. All discussions are motivated by an analysis that aims to characterize the dynamic relationship between concentrations of a liver enzyme (alanine aminotransferase) and three distinct doses (no drug, low dose, and high dose) of an nk-1 antagonist across four Phase II clinical trials.

Experimental and Theoretical Investigations of Phonation Threshold Pressure as a Function of Vocal Fold Elongation

PubMed Central

Tao, Chao; Regner, Michael F.; Zhang, Yu; Jiang, Jack J.

2014-01-01

Summary The relationship between the vocal fold elongation and the phonation threshold pressure (PTP) was experimentally and theoretically investigated. The PTP values of seventeen excised canine larynges with 0% to 15% bilateral vocal fold elongations in 5% elongation steps were measured using an excised larynx phonation system. It was found that twelve larynges exhibited a monotonic relationship between PTP and elongation; in these larynges, the 0% elongation condition had the lowest PTP. Five larynges exhibited a PTP minimum at 5% elongation. To provide a theoretical explanation of these phenomena, a two-mass model was modified to simulate vibration of the elongated vocal folds. Two pairs of longitudinal springs were used to represent the longitudinal elastin in the vocal folds. This model showed that when the vocal folds were elongated, the increased longitudinal tension would increase the PTP value and the increased vocal fold length would decrease the PTP value. The antagonistic effects contributed by these two factors were found to be able to cause either a monotonic or a non-monotonic relationship between PTP and elongation, which were consistent with experimental observations. Because PTP describes the ease of phonation, this study suggests that there may exist a nonzero optimal vocal fold elongation for the greatest ease for phonation in some larynges. PMID:25530744

Participation Dynamics in Population-Based Longitudinal HIV Surveillance in Rural South Africa

PubMed Central

Larmarange, Joseph; Mossong, Joël; Bärnighausen, Till; Newell, Marie Louise

2015-01-01

Population-based HIV surveillance is crucial to inform understanding of the HIV pandemic and evaluate HIV interventions, but little is known about longitudinal participation patterns in such settings. We investigated the dynamics of longitudinal participation patterns in a high HIV prevalence surveillance setting in rural South Africa between 2003 and 2012, taking into account demographic dynamics. At any given survey round, 22,708 to 30,495 persons were eligible. Although the yearly participation rates were relatively modest (26% to 46%), cumulative rates increased substantially with multiple recruitment opportunities: 68% of eligible persons participated at least once, 48% at least twice and 31% at least three times after five survey rounds. We identified two types of study fatigue: at the individual level, contact and consent rates decreased with multiple recruitment opportunities and, at the population level, these rates also decreased over calendar time, independently of multiple recruitment opportunities. Using sequence analysis and hierarchical clustering, we identified three broad individual participation profiles: consenters (20%), switchers (43%) and refusers (37%). Men were over represented among refusers, women among consenters, and temporary non-residents among switchers. The specific subgroup of persons who were systemically not contacted or refusers constitutes a challenge for population-based surveillance and interventions. PMID:25875851

Enhanced understanding of the relationship between erection and satisfaction in ED treatment: application of a longitudinal mediation model.

PubMed

Bushmakin, A G; Cappelleri, J C; Symonds, T; Stecher, V J

2014-01-01

To apportion the direct effect and the indirect effect (through erections) that sildenafil (vs placebo) has on individual satisfaction and couple satisfaction over time, longitudinal mediation modeling was applied to outcomes on the Sexual Experience Questionnaire. The model included data from weeks 4 and 10 (double-blind phase) and week 16 (open-label phase) of a controlled study. Data from 167 patients with erectile dysfunction (ED) were available for analysis. Estimation of statistical significance was based on bootstrap simulations, which allowed inferences at and between time points. Percentages (and corresponding 95% confidence intervals) for direct and indirect effects of treatment were calculated using the model. For the individual satisfaction and couple satisfaction domains, direct treatment effects were negligible (not statistically significant) whereas indirect treatment effects via the erection domain represented >90% of the treatment effects (statistically significant). Week 4 vs week 10 percentages of direct and indirect effects were not statistically different, indicating that the mediation effects are longitudinally invariant. As there was no placebo arm in the open-label phase, mediation effects at week 16 were not estimable. In conclusion, erection has a crucial role as a mediator in restoring individual satisfaction and couple satisfaction in men with ED treated with sildenafil.

Orbitofrontal gray matter deficits as marker of Internet gaming disorder: converging evidence from a cross-sectional and prospective longitudinal design.

PubMed

Zhou, Feng; Montag, Christian; Sariyska, Rayna; Lachmann, Bernd; Reuter, Martin; Weber, Bernd; Trautner, Peter; Kendrick, Keith M; Markett, Sebastian; Becker, Benjamin

2017-10-23

Internet gaming disorder represents a growing health issue. Core symptoms include unsuccessful attempts to control the addictive patterns of behavior and continued use despite negative consequences indicating a loss of regulatory control. Previous studies revealed brain structural deficits in prefrontal regions subserving regulatory control in individuals with excessive Internet use. However, because of the cross-sectional nature of these studies, it remains unknown whether the observed brain structural deficits preceded the onset of excessive Internet use. Against this background, the present study combined a cross-sectional and longitudinal design to determine the consequences of excessive online video gaming. Forty-one subjects with a history of excessive Internet gaming and 78 gaming-naive subjects were enrolled in the present study. To determine effects of Internet gaming on brain structure, gaming-naive subjects were randomly assigned to 6 weeks of daily Internet gaming (training group) or a non-gaming condition (training control group). At study inclusion, excessive Internet gamers demonstrated lower right orbitofrontal gray matter volume compared with Internet gaming-naive subjects. Within the Internet gamers, a lower gray matter volume in this region was associated with higher online video gaming addiction severity. Longitudinal analysis revealed initial evidence that left orbitofrontal gray matter volume decreased during the training period in the training group as well as in the group of excessive gamers. Together, the present findings suggest an important role of the orbitofrontal cortex in the development of Internet addiction with a direct association between excessive engagement in online gaming and structural deficits in this brain region. © 2017 Society for the Study of Addiction.