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Meta-Analysis
. 2006 Nov;244(5):668-76.
doi: 10.1097/01.sla.0000225356.04304.bc.

Comparison of effects in randomized controlled trials with observational studies in digestive surgery

Satoru Shikata  1 , Takeo Nakayama, Yoshinori Noguchi, Yoshinori Taji, Hisakazu Yamagishi
Affiliations
Meta-Analysis

Comparison of effects in randomized controlled trials with observational studies in digestive surgery

Satoru Shikata et al. Ann Surg. 2006 Nov.

Abstract

Objectives: To compare the results of randomized controlled trials versus observational studies in meta-analyses of digestive surgical topics.

Summary background data: While randomized controlled trials have been recognized as providing the highest standard of evidence, claims have been made that observational studies may overestimate treatment benefits. This debate has recently been renewed, particularly with regard to pharmacotherapies.

Methods: The PubMed (1966 to April 2004), EMBASE (1986 to April 2004) and Cochrane databases (Issue 2, 2004) were searched to identify meta-analyses of randomized controlled trials in digestive surgery. Fifty-two outcomes of 18 topics were identified from 276 original articles (96 randomized trials, 180 observational studies) and included in meta-analyses. All available binary data and study characteristics were extracted and combined separately for randomized and observational studies. In each selected digestive surgical topic, summary odds ratios or relative risks from randomized controlled trials were compared with observational studies using an equivalent calculation method.

Results: Significant between-study heterogeneity was seen more often among observational studies (5 of 12 topics) than among randomized trials (1 of 9 topics). In 4 of the 16 primary outcomes compared (10 of 52 total outcomes), summary estimates of treatment effects showed significant discrepancies between the two designs.

Conclusions: One fourth of observational studies gave different results than randomized trials, and between-study heterogeneity was more common in observational studies in the field of digestive surgery.

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Figures

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FIGURE 1. Summary profile of search for meta-analyses of randomized controlled trials.
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FIGURE 2. Summary profile of search for observational studies.
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FIGURE 3. Comparison of primary outcomes between observational studies and randomized controlled trials. This figure is based on data from 13 review articles and 10 meta-analyses of observational studies by the authors. OR, odds ratio; RR, relative risk; CI, confidence interval. *Outcome reporting relative risk rather than odds ratio.
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