TABLE 4.

Comparison of Effect Sizes Across Different Propensity Score Methods

Propensity Score Method	Absolute Risk Difference (95% Confidence Interval)	Relative Risk (95% Confidence Interval)
Propensity score matching	0.0185 (−0.018, 0.055)	0.88 (0.69, 1.13)
Stratification on the propensity score—5 strata	0.035 (0.006, 0.063)	0.75 (0.59, 0.96)
Stratification on the propensity score—10 strata	0.027 (−0.002, 0.056)	0.80 (0.63, 1.03)
Weighting—first estimator	0.020 (−0.008, 0.047)	0.86 (0.66, 1.01)
Weighting—doubly robust estimator	0.025 (−0.002, 0.052)	0.82 (0.66, 1.03)
Covariate adjustment using the propensity score	0.023 (−0.005, 0.052)	0.84 (0.68, 1.04)