Whether high quantities of center-based care cause behavior problems is a controversial question. Studies using covariate adjustment for selection factors have detected relations between center care and behavior problems, but studies with stronger internal validity less often find such evidence. We examined whether within-child changes in hours in…

This study examined bidirectional associations between cross-racial friendships and children's social and academic adjustment. Participants were 583 elementary school-age children in western Canada, or the midwestern United States (4-10 years; 279 girls; 143 Asian, 88 Black, 65 Hispanic or Latinx, 171 White, 116 mixed). Children's adjustment…

We examined developmental trajectories of attention-deficit/hyperactivity disorder (ADHD) symptoms, standardized achievement, and school performance for adolescents with and without ADHD who did and did not enroll in postsecondary education (PSE; N = 749; 79% boys; 63% White, 17% non-Hispanic Black, 10% Hispanic, and 10% other ethnicities). In a…

This study explored cyberbullying and cybervictimization (CBCV), for adolescents aged 11-15 from Tanzania (N = 426) and Canada (N = 592). Measurement invariance and model invariance was found for CBCV. In addition, multigroup structural equation modeling was used to explore several variables: age, gender, average hours online each day, accessing…

This study examined the associations between intrinsic motivation and achievement in mathematics in a sample of 1,478 Canadian school-age children followed from Grades 1 to 4 (ages 7-10). Children self-reported their intrinsic motivation toward mathematics, whereas achievement was measured through direct assessment of mathematics abilities.…

Using a genetic design of 840 60-month-old twins, this study investigated the genetic and environmental contributions to (a) individual differences in four components of cognitive school readiness, (b) the general ability underlying these four components, and (c) the predictive association between school readiness and school achievement. Results…

Examined contributions of attachment, maternal-reported stress, and mother-child interaction to the prediction of teacher-reported behavior problems in 121 French-Canadian children. Security of attachment significantly predicted likelihood of behavior problems: insecure children labeled controlling or other were most at risk for…

Accuracy-disabled and rate-disabled young Canadian readers were compared to children who were "fluent normal" readers. Children in the latter group decoded at the same level of accuracy as the rate-disabled subjects but at a significantly faster rate. Specific deficiencies of each of the disabled groups were identified. (Author/RH)

The accuracy of a risk index based on reproductive and demographic factors for predicting subsequent development was tested with 51 full-term and 53 preterm infants. In addition, the possibility that scores on the Home Observation for Measurement of the Environment scale might contribute significantly to the prediction of subsequent development…

Predictive links between social difficulties in early childhood and problems in middle childhood were examined. Peer, teacher, and self-assessments of behaviors and difficulties were obtained. Early peer rejection and aggression predicted later externalizing difficulties. Early poor peer acceptance, social isolation, and social incompetence…