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Systematic Review: Why sources of heterogeneity in meta-analysis should be investigated
Open accessAbstract
Although meta-analysis is now well established as a method of reviewing evidence, an uncritical use of the technique can be very misleading. One common problem is the failure to investigate appropriately the sources of heterogeneity, in particular the clinical differences between the studies included. This paper distinguishes between the concepts of clinical and statistical heterogeneity and exemplifies the importance of investigating heterogeneity by using published meta-analyses of epidemiological studies of serum cholesterol concentration and clinical trials of its reduction. Although not without some dangers of speculative conclusions, prompted by overzealous inspection of the data to hand, a sensible investigation of sources of heterogeneity should increase both the scientific and the clinical relevance of the results of meta-analyses.
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Metadata
- Authors
- Thompson, S. G.
- Affiliations
- London School of Hygiene & Tropical Medicine (GB)
- Corresponding author
- Thompson, S G
- ORCID
- Thompson, S G
- Venue
- BMJ
- Publisher
- BMJ
- Published
- 1994-11-19
- Volume
- 309
- Issue
- 6965
- Pages
- 1351-1355
- ISSN
- 0007-1447 (ISSN-L)
- 0959-8138
- 1468-5833
- PMC
- PMC2541868
- OpenAlex
- W1511524925
- Cited by
- 1,017
- References
- 32
- Citations by year
- 2026: 23 · 2025: 35 · 2024: 38 · 2023: 29 · 2022: 30 · 2021: 47 · 2020: 38 · 2019: 32 · 2018: 36 · 2017: 26 · 2016: 24 · 2015: 24 · 2014: 31 · 2013: 48 · 2012: 51
- FWCI
- 3.70
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- www.bmj.com/company/legal-information/terms-conditions/legal-information/tdm-licencepolicy (tdm)
- Locations
- BMJ (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Epidemiology
- Social Sciences › Sociology and Political Science › Delphi Technique in Research
- Keywords
- meta-analysis heterogeneity, clinical heterogeneity, statistical heterogeneity, serum cholesterol, cholesterol lowering, meta-analysis methodology, overfitting
- MeSH terms
- Adult, Aged, Aging, Cholesterol, Clinical Trials as Topic, Humans, Middle Aged, Neoplasms, Research Design, Meta-Analysis as Topic, Randomized Controlled Trials as Topic, Risk Assessment
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