Caution should be used in applying propensity scores estimated in a full cohort to adjust for confounding in subgroup analyses: commentary on "Applying propensity scores estimated in a full cohort to adjust for confounding in subgroup analyses": Commentary on "Applying propensity scores estimated in a full cohort to adjust for confounding in subgroup analyses"
Pharmacoepidemiol Drug Saf. 2012 Jul;21(7):710-712.
doi: 10.1002/pds.3202.
Epub 2012 May 30.