Addressing challenges in reviewing e-cigarette evidence: proposing a new ‘Test for Dominance’ in systematic reviews
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ID: 320404
2026
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Abstract
Abstract Background Current systematic review evidence on e-cigarettes as a smoking cessation tool is contested. Part of the reason for this is the difficulty of objectively assessing the limited and heterogeneous evidence base. The study aim was to develop a novel approach to testing the validity of systematic reviews and assessing the extent of the dominance of included primary studies. Methods Leave-one-out meta-analysis was used to measure dominance. The systematic review on e-cigarettes as a smoking cessation tool by Hanewinkel et al. was used as a proof of concept. Results The Hajek et al. study dominates the Hanewinkel et al. systematic review, exerting a disproportionate influence on the overall pooled effect. Conclusions This research has identified a gap in current approaches to validity testing in systematic reviews. The Test for Dominance could supplement existing testing, including tests for heterogeneity, sensitivity analysis, and subgroup analysis. When a single study dominates a systematic review, the findings of that review should be interpreted with caution and further randomised controlled trials undertaken to reduce such distortion.
| Reference Key |
openalex_W7167943926
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| Authors | Garth Reid, Glenna Nightingale, Nason Maani, Mike Smith, Mark Petticrew |
| Journal | turkish journal of public health |
| Year | 2026 |
| DOI |
10.1093/pubmed/fdaf149
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| URL | |
| Keywords | Keywords not found |
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