2-9 Reviews of fair comparisons should be systematic

Reviews that do not use systematic methods may result in biased or imprecise estimates of the effects of treatments because the selection of studies for inclusion may be biased or the methods may result in some studies not being found. In addition, the appraisal of some studies may be biased, or the synthesis of the results of the selected studies may be inadequate or inappropriate.

Whenever possible, use systematic reviews of fair comparisons rather than non-systematic reviews of fair comparisons of treatments to inform your decisions.

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Another example of unnecessary research, yet again because the results of preceding studies had not been gathered together and analyzed, […]

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