More intensive anti-bullying programs are more effective¶

Claim · All claims
Evidence · 1 study · quant-synthesis r? · q3
Currency · newest study 2011 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

Reading the evidence codes

q is the design tier, i the impact, n the sample, and the kind with its r the rigour judged within that kind: what each code means.

This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.

q3 i? Program intensity was associated with effectiveness: more intensive programs were more effective in reducing bullying and victimization. → Maria M. Ttofi 2011

Evidence¶

Maria M. Ttofi 2011¶

Maria M. Ttofi, David P. Farrington. (2011). Effectiveness of school-based programs to reduce bullying: a systematic and meta-analytic review. J Exp Criminol. https://doi.org/10.1007/s11292-010-9109-1

q3 · i? · quant-synthesis · r?

The meta-analysis pooled 44 program evaluations; the analysis of program elements, including intensity, covered only the 40 of those 44 whose coding researchers gave feedback on. It associates program features with effects across evaluations, so it does not isolate intensity as a cause. The review reports that "More intensive programs were more effective"; no effect size for the intensity moderator is printed.

"More intensive programs were more effective, as were programs including parent meetings, firm disciplinary methods, and improved playground supervision"

Discussion¶

Learner Variables¶

Safety — outcome: instruction changes it

Effectiveness of anti-bullying programs varies significantly across evaluations (heterogeneity) — a broader claim this one bears on
School-based anti-bullying programs reduce bullying perpetration and victimization globally — a broader claim this one bears on
School-based anti-bullying programs decrease victimization by 17-20% on average — a broader claim this one bears on
Parent meetings, firm disciplinary methods, and improved playground supervision are program elements associated with decreases in bullying and victimization — related
The Olweus Bullying Prevention Program produced the largest effect sizes for bullying perpetration, with effectiveness varying between Norway and USA evaluations — related
School-based anti-bullying programs are effective overall, decreasing bullying by 20-23% on average — related

Page metadata

Field	Value
`type`	`claim`
`id`	`more-intensive-anti-bullying-programs-more-effective`
`title`	`More intensive anti-bullying programs are more effective`
`description`	`More intensive anti-bullying programs are more effective`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2011`
`source_checked`	`2026-10-20`
`generated`	by `process:wiki-ingest` on `2026-10-15`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `maria-m-ttofi-2011`

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