Editorial summary. This is our text summary of an article published by campbell-collaboration. Charts, figures, and the author’s full voice are at the original — read it there .
Editorial verdict
Landmark systematic review. The core finding — that engineering controls and organizational-level interventions outperform individual-level approaches — is supported by 100 studies and over 31 million participants, though heterogeneity, methodological limitations, and publication bias concerns temper confidence in precise effect sizes.
Executive summary
This systematic review examines the effectiveness of workplace safety interventions in preventing occupational accidents. Conducted by researchers affiliated with the Campbell Collaboration, the review synthesizes 100 studies (16 RCTs, 30 controlled before-after studies, 54 interrupted time series) encompassing over 31 million participants across diverse industries and geographies, though predominantly Western contexts. The authors argue that group- and organizational-level interventions consistently outperform individually targeted approaches, with engineering controls demonstrating the strongest and most consistent effects — particularly passive controls that eliminate hazards independent of worker behavior. Safety climate interventions showed modest short-term results, behavioral and attitudinal approaches demonstrated limited standalone effectiveness, and physiological modifications showed negligible impact. Regulation and enforcement produced small but more consistent positive effects. Multifaceted interventions incorporating engineering or administrative controls alongside training showed moderate-to-strong effects, while those combining only attitudinal and behavioral components mirrored the weak results of single-component individual-level interventions. The review concludes that interventions aligned with the Public Health Hierarchy of Hazard Control — eliminating risks at source — yield the strongest outcomes. Significant heterogeneity, methodological weaknesses across included studies, and limited representation from Africa and Asia constrain generalizability.
Key insights
- 1Engineering controls, particularly passive controls that operate independently of human decision-making, demonstrated the strongest evidence of effectiveness in reducing workplace injuries, with meta-analytic effect sizes as strong as OR: 0.28 at short-term follow-up.
- 2Individual-level interventions — including safety campaigns, educational approaches, behavioral training, and physiological conditioning — consistently showed little to no significant impact on workplace accident rates across all intervention types examined.
- 3Multifaceted interventions produced more consistent outcomes when engineering or administrative control components were included; high heterogeneity (I²=94%) decreased substantially when such components were required, suggesting these components drive effectiveness in combined approaches.
Practical takeaways
- Interventions that eliminate hazards at the source or separate workers from hazardous conditions — consistent with the Public Health Hierarchy of Hazard Control — demonstrated more consistent injury reductions than approaches relying on modifying individual worker knowledge, attitudes, or behavior.
- Enforcement-based structural interventions showed more consistent positive findings than legislative interventions alone, particularly when penalties were imposed rather than consultations offered, though effect sizes remained modest across all structural approaches.
Frameworks mentioned
Theory of Reasoned Action
A social psychology model used to explain attitude-based safety interventions, positing that behavioral intentions are shaped by attitudes and subjective norms.
Theory of Planned Behavior
An extension of the Theory of Reasoned Action incorporating perceived behavioral control, applied here to explain attitudinal approaches to workplace safety.
KAP Model
Knowledge-Attitudes-Practices model, which posits that providing safety information alters beliefs and subsequently influences behavior; received limited empirical support in workplace accident prevention contexts.
References
- Lund and Aarø (2004).Conceptual framework for workplace safety intervention classification.
- Not specified (2002).Modified supervisory practices and minor injury reduction (Zohar).
- Not specified (1988).Goal-setting and feedback intervention (Mattila and Hyoedynamaa).
Source & Provenance
campbell-collaboration
Johnny Dyreborg, Hester Johnstone Lipscomb, Kent Nielsen, Marianne Törner, Kurt Rasmussen, Karen Bo Frydendall, Hans Bay, Ulrik Gensby, Elizabeth Bengtsen, Frank Guldenmund, Pete Kines
June 1, 2022
Meta-Analysis/Review
Global
Original source metadata is preserved. AI analysis is generated separately.
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