A Meta-Analysis of School-Based Bullying Prevention Programs ’ Effects on Bystander Intervention Behavior

Abstract

This meta-analysis synthesized bullying prevention programs’ effectiveness at increasing bystander intervention in bullying situations. Evidence from 12 school-based programs, involving 12,874 students, indicated that overall the programs were successful (Hedges’s g .20, 95% confidence interval [CI] .11 to .29, p .001), with larger effects for high school… (More)

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