Journal Article10.1002/SIM.1301
Issues in the meta-analysis of cluster randomized trials
Allan Donner,Neil Klar +1 more
649
TL;DR: A review and comment on a selected number of issues, including problems of study heterogeneity, difficulties in estimating design effects from individual trials and the choice of statistical methods, including those raised by meta-analyses which include only individually randomized trials.
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Abstract: Meta-analyses involving the synthesis of evidence from cluster randomization trials are being increasingly reported. These analyses raise challenging methodologic issues beyond those raised by meta-analyses which include only individually randomized trials. In this paper we review and comment on a selected number of these issues, including problems of study heterogeneity, difficulties in estimating design effects from individual trials and the choice of statistical methods.
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TL;DR: For RCTs to ultimately benefit patients, the published report should be of the highest possible standard and should provide the reader with the ability to make informed judgments regarding the internal and external validity of the trial.
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