How can I pool the odds ratios from 2 samples (2 subgroups of the same sample) into one odds ratio, for the general sample?

If I want to do a meta-analysis and one study reports the data on two subgroups of the same sample, is it possible to calculate a pooled odds ratio? Or am I forced to use 2 subgroups?

25 May 2020 1,408 2 View