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This study sought to appraise internationally published literature investigating bullying in its association with deliberate self-harm (DSH). A systematic review and series of meta-analyses using random effects models were conducted. A total of 68 effect sizes, analyzing data from 156,284 adolescents aged 11-19 years were examined. Results showed significant associations between both traditional bullying perpetration (OR 1.81, 95% CI 1.33, 2.47, p < .0001) and victimization (OR 2.34, 95% CI 1.89, 2.89, p < .0001) and DSH. Cyber-bullying victimization (OR 3.55, 95% CI 2.71, 4.65, p < .0001) and the co-occurrence of traditional and cyber-bullying victimization (OR 3.39, 95% CI 1.56, 7.37, p = .002) were also associated with DSH. Moderator analyses showed variation in results based on methodological- and sample-level variables. Findings suggested that exposure to bullying, either as perpetrators or victims, poses risks for DSH.
Heerde et al. (Wed,) studied this question.