9.6.5  Selection of study characteristics for subgroup analyses and meta-regression

Introductory text

9.6.5.1  Ensure that there are adequate studies to justify subgroup analyses and meta-regressions

9.6.5.2  Specify characteristics in advance

9.6.5.3  Select a small number of characteristics

9.6.5.4  Ensure there is scientific rationale for investigating each characteristic

9.6.5.5  Be aware that the effect of a characteristic may not always be identified

9.6.5.6  Think about whether the characteristic is closely related to another characteristic (confounded)