Fig. 1From: How to perform prespecified subgroup analyses when using propensity score methods in the case of imbalanced subgroupsComparison of strategies according to the PS model in Scenario 1. Comparison of “across subsets” or “within subsets” strategy in terms of the mean absolute bias (A), variance (B) and the coverage of the 95% CI (C) according to the PS model. S1 = subset 1; S2 = subset 2Back to article page