Assessment of School Anti-Bullying Interventions: A Meta-analysis of Randomized Clinical Trials.

Importance: Bullying is a prevalent and modifiable risk factor for mental health disorders. Although previous studies have supported the effectiveness of anti-bullying programs; their population impact and the association of specific moderators with outcomes are still unclear.

Objective: To assess the effectiveness of school anti-bullying interventions, their population impact, and the association between moderator variables and outcomes.