Fig. 5

Forest plot of all studies included in the subgroup meta-analyses for known-groups validity. ^aGroup numbers (i.e. “Total”) for both groups have been divided by the number of times each group has been included in the specific subgroup meta-analysis. ^bGroup number (i.e. “Total”) for the control group only has been divided by the number of times the group has been included in the specific subgroup meta-analysis