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"Bullying is a ubiquitous form of aggression in schools worldwide. Intervention and prevention programs targeting school bullying perpetration and victimization are effective, yet more research is needed to understand variability in effectiveness.
The main findings of our review are that anti-bullying programs were effective in reducing bullying perpetration outcomes by roughly 18-19% and bullying victimization by roughly 15-16%. There are substantial variations in effects, and the reasons for these variations require further research."