High sleep quality has been associated with beneficial outcomes across the life span. Intensive longitudinal studies suggest that these beneficial effects can also be observed on a day-to-day level. However, the dynamic interplay between subjective sleep quality and affective well-being in children's daily life has only rarely been investigated.…

The present study tests two predictions stemming from the hypothesis that a source of difficulty with rational numbers is interference from whole number magnitude knowledge. First, inhibitory control should be an independent predictor of fraction understanding, even after controlling for working memory. Second, if the source of interference is…

The goal of this study was to examine the unique associations of aggression with peer status in a non-Western context. The moderating effects of peer community and teacher closeness at the classroom level and gender and grade at the individual level were considered. Participants were 1954 third to sixth grade students (M[subscript age] = 9.60…

Data from 790 older school-age (M[subscript age] = 10.2 years, SD = 1.2 years) girls (N = 427) and boys from Barranquilla, Colombia (N = 449) and Montréal, Canada (N = 331) were used to replicate findings reported by Valdivia et al. (2005). This prior study revealed contextual variations in the association between two measures of social behavior,…

The present study aims to provide a systematic understanding of how perspective-taking ability contributes to primary-school students' cooperative behaviours and learning outcomes. The present study is frontline as we combined person-oriented (e.g., describing patterns of behaviours based on individual characteristics), process-oriented (e.g.,…

Taking the elementary students of grade 5 in Jiangsu Province as the object, the research is carried out on the family and peer factors that affect the academic pressure of elementary students. The results show that parent-child relationships and peer relationships are critical protective factors for elementary students' academic pressure. The…

This study examined the development of social skills across five measurement points from 4th through 7th grade, and the influence of child gender and school-related factors on the level and growth of social skills, in a large sample of normally developing children in Norway (N = 2,076). On average, children's social skills scores increased…

The authors, with Swedish elementary school students (N = 201), 9-12 years old, examined the potential significance to self-perceived academic competence of students' cross-ethnic friendship ties and prosocial behavior to better understand education's minority achievement gap. A crossed-lagged panel model was tested to investigate potential…

Many societies are encountering significant changes in their population structure as the number of older people is increasing while children and adolescents become fewer. This study examines pupils' attitudes towards elderly people in Germany. A total of 935 pupils (458 boys, 477 girls) participated in this study. Grade distribution was as…

Purpose: The purpose of this study was to determine the acute dose-response relationship of classroom exercise breaks with executive function and math performance in 9- to 12-year-old children by comparing 5-min, 10-min, or 20-min classroom exercise breaks to 10 min of sedentary classroom activity. Method: This study used a within-subjects…

The present study investigated whether salient preadolescent behaviors and experiences predicted parents' and teachers' underestimation of preadolescents' shyness. Participants included a community sample of 129 fifth and sixth graders, along with one parent and teacher per preadolescent. Preadolescents, parents, and teachers provided reports…

Background: Schools are an important environmental context in children's lives and are part of the complex web of factors that contribute to childhood obesity. Increasingly, attention has been placed on the importance of school climate (connectedness, academic standards, engagement, and student autonomy) as 1 domain of school environment beyond…

The purpose of this study was to examine adolescent's hostile attributions of mother's intent and emotional self-expectancies as contributors to expression of emotion between mothers and adolescents. Data were collected from 268 10- to 12-year-olds (133 girls, 135 boys) and their mothers. Each dyad was observed in a conversational activity that…

This study tests the predictive associations between externalizing behaviors and internalizing symptoms and examines the mediating roles of social competence, parent-child conflicts, and academic achievement. Using youth-, parent-, and teacher-reported longitudinal data on a sample of 523 boys and 460 girls from late childhood to early…

The present study examined the role of attachment toward mother and father as a predictor of eating pathology and weight gain among preadolescent boys and girls. Self-report questionnaires and adjusted body mass index (BMI) were administered from a community sample of 601 preadolescents (8-11 years; 48% female) at baseline and once again 1 year…