Two observers independently coded the effect sizes from the articles. Data were pooled using a random effects model. MAIN OUTCOMES AND MEASURES This study focused on suicidal ideation and suicide attempts. Peer victimization was hypothesized to be related to suicidal ideation and suicide attempts. RESULTS Peer victimization was found to be related to both suicidal ideation (odds ratio, 2.23 [95% CI, 2.10-2.37]) and suicide attempts (2.55 [1.95 -3.34]) among children and adolescents. Analyses indicated that these results were not attributable to publication bias. Results were not moderated by sex, age, or study quality. Cyberbullying was more strongly related to suicidal ideation compared with traditional bullying. CONCLUSIONS AND RELEVANCE Peer victimization is a risk factor for child and adolescent suicidal ideation and attempts. Schools should use evidence-based practices to reduce bullying.

Studies have shown that both Big Five and Dark Triad (Machiavellianism, narcissism, psychopathy) personality traits are related to traditional bullying and cyberbullying behaviors in adolescents as well as in adults. Increasingly, scholars call for sadism as an addition to the Dark Triad in the study of antisocial and delinquent behaviors. In the current study we analyze whether the Big Five, Dark Triad and sadism predict traditional bullying and cyberbullying. The sample consisted of 1,568 participants (61.9 % female), ranging in age from 16 to 21 years. Using hierarchical linear regression analyses, controlling for age and gender, it was found that agreeableness, Machiavellianism, psychopathy and sadism were significantly related to traditional bullying, and agreeableness and sadism were related to cyberbullying. Taken together, the results more firmly establish that sadism could be a predictor of antisocial behaviors, by establishing its relations with bullying and cyberbullying.

Research suggests that overweight and obese youths are stigmatized in contemporary society, and are more likely than normal-weight youths to become the victims of bullying. In the current study, meta-analyses were performed to analyze to what extent overweight and obese youths are more likely than normal-weight youths to be the victims of bullying. The databases Psychinfo, ERIC and Medline were searched for relevant articles. Retrieved articles were scanned to find further articles. Language was not used as an exclusion criterion. A total of 14 articles (N=55 231) were included in a meta-analysis on bullying and overweight youths, and a total of 16 articles (N=58 520) were included in a meta-analysis on bullying and obese youths. The results suggested that both overweight and obese youths were more likely to be victims of bullying. The results were not moderated by gender, overweight and obese boys and girls were equally likely to be victimized. Results remained significant after adjustment for publication bias. Both overweight and obesity are risk factors for being a victim of bullying.

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Involvement in bullying as a victim, bully, or bully-victim is related to weapon carrying.