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Machiavellianism is an antisocial interpersonal style involving the use of manipulative, deceptive, and coercive behaviors in the pursuit of self-interest. Although widely studied as a "dark" personality trait in adults, relatively little is known about the developmental correlates of Machiavellian tendencies earlier in life. The present study addressed this knowledge gap by examining associations between Machiavellian behavior and three theoretically relevant social–emotional domains—prosocial emotions, emotion recognition skills, and self-control—in a community sample of 7- and 11-year-old Canadian children (N = 300, 50% female). Of particular interest was the extent to which individual differences in social–emotional capacities were uniquely associated with Machiavellian behavior after controlling for aggression, a relatively well-studied antisocial behavior in childhood. Parents reported on children's Machiavellian behavior and aggression. Social–emotional correlates were assessed via parent and child reports, behavioral tasks, and physiological assessments. Machiavellian behavior and aggression were similarly associated with lower parent-reported prosocial emotions and self-control. Machiavellian (but not aggressive) behavior was associated with lower child-reported guilt (a prosocial emotion), higher resting skin conductance levels (reflecting a general tendency for higher arousal), and better anger recognition. Semipartial correlational analyses indicated that these patterns of association with Machiavellian behaviors held independent of aggression. These findings indicate that, by middle childhood, Machiavellian behavior constitutes a distinct form of antisocial conduct that is associated with a unique social–emotional risk profile. Public Significance Statement: By middle childhood, Machiavellian behaviors such as manipulation, deception, and coercion are distinct from aggression in terms of their occurrence and associations with other domains of social–emotional functioning (e.g., prosocial emotions, emotion recognition ability, self-control). This suggests that traditional prevention and intervention programs targeting aggressive and violent tendencies may be less effective at curbing more subtle and self-serving forms of antisocial conduct. [ABSTRACT FROM AUTHOR]

Preschool programs for socially vulnerable children are believed to affect school readiness and language development but infrequently include follow-up to adolescence; observational measurement of receptive vocabulary is rare. The purpose of this longitudinal cohort study (55 children and 41 parents) was to report the trajectory of receptive vocabulary development for socially vulnerable children of diverse ethnicities (Indigenous, other Canadian-born, and Immigrant) who participated in a two-generation preschool program. English receptive vocabulary scores were measured at 5-time points: (a) program intake, (b) program exit, (c) age 7 years, (d) age 10 years, and (e) adolescence, using the Peabody Picture Vocabulary Test – Third Edition (PPVT-III). For all children, PPVT-III scores increased the most between program intake and exit and positive changes were sustained until adolescence. When the sample was examined by gender, PPVT-III scores were higher for boys than girls at all time points. When the sample was examined by ethnicity, other Canadian-born children scored higher than Indigenous and Immigrant children at all time points. Immigrant children scored lowest until age 7 years, and at age 10 years and adolescence scored higher than Indigenous children. Using mixed-effects modeling, PPVT-III scores increased when English was the primary language spoken at home at intake. PPVT-III scores increased slightly as caregiver age and caregiver Adverse Childhood Experiences score increased. PPVT-III scores were lower for Immigrant girls and Indigenous boys than other sub-groups of children. Differential effects of the two-generation preschool program by gender and ethnicity suggest tailoring programming to increase equitability of receptive vocabulary development for immigrant girls and Indigenous boys. Children with intergenerational adversity may require additional support. [ABSTRACT FROM AUTHOR]

Objective: To describe shoulder-related injury rates (IRs), types, severity, mechanisms, and risk factors in youth ice hockey players during games and practices. Design: Secondary analysis of data from a 5-year prospective cohort study, Safe-to-Play (2013-2018). Setting: Canadian youth ice hockey. Participants: Overall, 6584 player-seasons (representing 4417 individual players) participated. During this period, 118 shoulder-related games and 12 practice injuries were reported. Assessment of Risk Factors: An exploratory multivariable mixed-effects Poisson regression model examined the risk factors of body checking policy, weight, biological sex, history of injury in the past 12 months, and level of play. Main Outcome Measures: Injury surveillance data were collected from 2013 to 2018. Injury rates with 95% confidence interval (CI) were estimated using Poisson regression. Results: The shoulder IR was 0.35 injuries/1000 game-hours (95% CI, 0.24-0.49). Two-thirds of game injuries (n = 80, 70%) resulted in.8 days of time-loss, and more than one-third (n = 44, 39%) resulted in >8 days of time-loss. An 83% lower rate of shoulder injury was associated with policy prohibiting body checking compared with leagues allowing body checking (incidence rate ratio [IRR], 0.17; 95% CI, 0.09-0.33). A higher shoulder IR was observed for those who reported any injury in the last 12-months compared with those with no history (IRR, 2.00; 95% CI, 1.33-3.01). Conclusions: Most shoulder injuries resulted in more than 1 week of time-loss. Risk factors for shoulder injury included participation in a body-checking league and recent history of injury. Further study of prevention strategies specific to the shoulder may merit further consideration in ice hockey. [ABSTRACT FROM AUTHOR]

This study investigates associations between initial levels and change in the quality of the relationships youth with intellectual disabilities (ID) share with their parents and teachers, and changes in their levels of depression over time. A sample of 395 youth with mild (48.3%) and moderate (51.7%) ID, aged between 11 and 22 (M = 15.69), were recruited in Canada (n = 142) and Australia (n = 253). Youth completed self-report measures of relationship quality and depression twice over a one-year period. Initial levels of warmth (β = −.109) and conflict (β = −.302) predicted decreases in depression. Increases in warmth predicted decreases in depression (β = −.179), while increases in conflict predicted increases in depression (β =.268). Discrepancies between youth relationships with their parents and teachers predicted decreases in depression (βwarmth = −.732; βconflict = −.608). [ABSTRACT FROM AUTHOR]

The article discusses a cross-sectional study conducted in Ontario which found a 139 percent increase in pediatric eating disorder hospitalizations from 2002 to 2019.