School-Based Programs to Reduce Bullying and Victimization: A Systematic Review

BACKGROUND School bullying has serious short-term and long-term effects on children’s physical and mental health. Various anti-bullying programs have been implemented world wide and, more rarely, evaluated. Previous narrative reviews, summarizing the work done on bullying prevention, as well as previous meta-analyses of anti-bullying programs, are limited. The definition of school bullying includes several key elements: physical, verbal, or psychological attack or intimidation that is intended to cause fear, distress, or harm to the victim; an imbalance of power (psychological or physical), with a more powerful child (or children) oppressing less powerful ones; and repeated incidents between the same children over a prolonged period. School bullying can occur in school or on the way to or from school. It is not bullying when two persons of the same strength (physical, psychological, or verbal) victimize each other. OBJECTIVES This report presents a systematic review and meta-analysis of the effectiveness of programs designed to reduce school bullying perpetration and victimization (i.e. being bullied). The authors indicate the pitfalls of previous reviews and explain in detail how the present systematic review and meta-analysis addresses the gaps in the existing literature on bullying prevention. SELECTION CRITERIA Studies were included in this review if they evaluated the effects of an anti-bullying program by comparing an experimental group who received the intervention with a control group who did not. The word ‘experimental’ here refers to students who received the program and does not necessarily imply randomization. Four types of research design were included: a) randomized experiments, b) experimental-control comparisons with before and after measures of bullying, c) other experimental-control comparisons and d) quasi-experimental age-cohort designs, where students of age X after the intervention were compared with students of the same age X in the same school before the intervention. Both published and unpublished (e.g. PhD theses) reports were included. 4 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice.

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