Bullying is grounded in the interactions between an individual and complex social-ecological systems. Therefore, bullying involvement is not just confined to the classroom or school. Recent research suggests that sibling aggression may be a predictor for peer-level aggression. These findings may be more relevant for students with disabilities…

Introduction: This study assessed the influence of exposure to pro-tobacco advertisements on experimentation with emerging tobacco products among U.S. adolescents aged =9 years, in Grades 6 to 12. Method: Data were obtained from the 2011 National Youth Tobacco Survey. Multivariate logistic regression was used to measure the association between…

Evidence is building regarding the association between inadequate amounts of sleep and the risk of obesity, especially in younger children. Less is known about the relationship between change in sleep and change in weight during adolescence. The objective of this study was to examine the longitudinal relationship between change in sleep duration…

This study extends previous research on the long-term connections between motivation constructs in expectancy-value theory and achievement outcomes. Using growth mixture modelling, we examined trajectories of change for 421 students from 4th grade through college in their self-concept of ability (SCA) in math, interest in math, and perceived…

Research on bullying is an important avenue for understanding the social integration of students in special education. Focused on 3,305 students who self-reported victimization of two to three times per month or more, this study compared the pattern of verbal, relational, and physical bullying among students in general education and special…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…

The present study examined age-group differences in students' self-reports of metacognitive activity in physical education settings. Five hundred and ten students of public elementary, junior and senior high school provided self-reports concerning the metacognitive processes they use during physical education lessons, their goal orientations and…