The selection of a summary statistic for use in meta-analysis depends on balancing three criteria (Deeks 2002). These give different pooled results in a meta-analysis, sometimes dramatically so. We can calculate the risk ratio of an event occurring or the risk ratio of no event occurring. A further complication is that there are in fact two risk ratios. The risk ratio (relative risk) and odds ratio are relative measures, while the risk difference and number needed to treat are absolute measures. The effect of intervention can be expressed as either a relative or an absolute effect. Summary statistics for dichotomous data are described in Section 9.2.2. 9.4.4.4 Which measure for dichotomous outcomes? For the current version, please go to /handbook/current or search for this chapter here. This is an archived version of the Handbook.
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