I was trying to do meta analysis o effect of ART on congenital anomalies. I was trying  to do subgroup analysis. I am getting data for subgroups  (ART, PI, NRTI, NNRTI) from one study. Can I take and put them together in Rev man. When i didthe author may appear 2 times in the pooled analysis. Did any one has information how to inter this type of data in Revman or Stata.

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