Fig. 3From: Double-adjustment in propensity score matching analysis: choosing a threshold for considering residual imbalancePercentage of biased estimates according to the estimator in (a and c) the linear, additive scenario and (b and d) the non-linear, non-additive scenario. The double-robust estimator was adjusted for unbalanced covariates using standardized absolute mean difference (SMD) thresholdsBack to article page