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Children who show elevated levels of indirect aggression (IA) from childhood to adolescence are at increased risks of experiencing detrimental outcomes. Some studies suggest that psychopathic traits could act as a predisposing vulnerability in the development of IA, but the contributions of all three dimensions of psychopathic traits in explaining developmental trajectories of IA from childhood to adolescence remain unclear. This study aimed to determine if the three dimensions of psychopathic traits during childhood (i.e., callous-unemotional, narcissism-grandiosity, and impulsivity-irresponsibility at 6-9 years old) increase the risk of following a high IA trajectory across preadolescence, and whether sex moderated these associations. Participants were 744 children (47% girls; 93% born in Quebec, Canada, and over 50% from low socioeconomic backgrounds) assessed annually over 5 years. Approximately half of them (n = 370; 40.3% girls) were referred to school-based services for conduct problems (CP) at study intake. Latent class growth analyses revealed four developmental trajectories of IA, which were regressed on psychopathic traits dimensions using a three-step approach. After adjusting for demographic confounders, CP, and other dimensions of psychopathic traits, only narcissism-grandiosity traits significantly predicted memberships to a high and stable trajectory of IA use. The associations between the other dimensions of psychopathic traits and IA trajectories were not significant when considering confounders. No moderating effects by child sex were observed. These results suggest that narcissism-grandiosity traits could be of use for clinicians aiming to detect children most at risk of showing high and persistent levels of IA.

Classroom placement of twins is an ongoing issue for educational policy. Many educational jurisdictions have standard policy most commonly founded in the belief that separation supports individual identity, personal development and academic opportunity. This study examined the effects of classroom placement in a sample of 560 twin pairs whose behaviors were assessed from ages 5 to 12 years. We found no detrimental effect of classroom sharing on twins' social development. In contrast, this study provides evidence that educating twins together is associated with modest positive twins' behaviors and social functioning at school. Implications for educational policies are further discussed.

School dropout can be an ongoing process of academic failure and disengagement starting as early as elementary school. Given the importance of early identification of risk factors, the present study examines (a) whether early conduct problems and depressive symptoms predict a higher risk of school dropout, (b) whether depressive symptoms moderate the association between conduct problems and risk of school dropout, and (c) the sex differences in these associations. Using data from a longitudinal study on 744 children aged 6-9 (T1), a multiple linear regression was performed to test for the effect of conduct problems and depressive symptoms (T1) and the interaction between them on the risk of school dropout (T8), as well as for sex differences in these associations. Results showed that conduct problems significantly predicted a higher risk of school dropout 7 years later, while depressive symptoms did not. Depressive symptoms significantly moderated the effect of conduct problems on the risk of dropout, with conduct problems having a stronger effect in children with higher depressive symptoms. No sex differences were found. These results suggest that recognizing and treating depressive symptoms in children with conduct problems may be an important step in reducing their risk of dropout.

This study examined the longitudinal contribution of four different childcare arrangements attended during the preschool years to social behaviors and academic achievement up to age 15 years. Children participating in a Canadian longitudinal survey with available information on childcare attendance between ages 3 and 5 years (N = 6,852) were measured on multiple social behaviors (hyperactivity/inattention, depression/anxiety, disruptive behaviors) and academic outcomes (mathematic skills, academic achievement) across both childhood and adolescence. We conducted a propensity score matching analysis to control the selection bias for childcare attendance and performed generalized estimating equation models for panel data among matched groups. Our results showed no clear social or academic long-term advantage for Canadian children of attending any childcare arrangement in comparison to children being exclusively cared for by their parents. In contrast, children attending daycare centers had higher levels of hyperactivity/inattention until the age of 15 years. Children also had lower mathematic skills if attending daycare centers or informal childcare at preschool age, but this effect dissipated from childhood to adolescence. Interestingly, children from low-income families had higher levels of depression/anxiety if being cared for at home by someone other than their parents or relatives. This finding supports the dual-risk hypothesis suggesting that children from already impoverished families and attending informal childcare in their own home are at greater risk for internalizing difficulties.