Frank Vitaro

TL;DR: The Preschool Behaviour Questionnaire has been used widely to assess children's aggressive, anxious, and hyperactive behaviour as discussed by the authors, and items from the prosocial behaviour questionnaire were added to create a prosocial scale.

TL;DR: It is found that behavioural consistency over middle childhood varied across trajectory groups and across dimensions, and sex differences in the distribution of children in the different trajectory groups that may reflect gender-specific risks for psychopathology are identified.

TL;DR: Inhibition and social withdrawal, although behaviorally similar, present different risks for later outcomes and, therefore, should be differentiated conceptually and empirically.

TL;DR: This paper investigated whether friendships with deviant peers, in addition to being related to adolescents' behavioral adjustment problems, would also be negatively related with adolescents' emotional adjustment, and found that adolescents who had either no mutual friends, nondeviant friends, or deviant friends were more delinquent than the other 2 groups.

TL;DR: Early childhood preventive interventions should target parenting skills and child behaviors, particularly within families with insufficient income.