The need for large-scale randomized evidence.
The reliable detection of moderate differences in major health outcomes that arise as a result of treatment requires large-scale randomized evidence (and the appropriate interpretation of this evidence once it has been generated). This may take the form of a single mega-trial or, exceptionally, a meta-analysis of many smaller randomized trials may provide worthwhile information. Small or non-randomized studies cannot generally be trusted to distinguish reliably between a moderate benefit, a m...Expand abstract
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