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Table 3 Estimated odds ratios (OR) of death and 95% confidence interval using naive, propensity score matching, or IPTW approaches

From: Evaluation of the Propensity score methods for estimating marginal odds ratios in case of small sample size

Model Adjustment in the original set PS-matched sample IPT-Weighted sample
Covariates OR (95%CI) p-value No pairs OR (95%CI) p-value Sum of weights OR (95%CI) p-value
X1 = age 0.44 (0.14;1.42) p = 0.17 22 0.27 (0.06;1.23) p = 0.091 327.5 0.39 (0.11;1.32) p = 0.13
X2 = beta2micro 0.47 (0.15;1.47) p = 0.19 23 0.27 (0.05;1.41) p = 0.12 330.0 0.48 (0.14;1.65) p = 0.25
X3 = time to relapse 0.24 (0.07;0.84) p = 0.026 23 0.19 (0.05;0.65) p = 0.0088 349.1 0.27 (0.08;0.92) p = 0.039
X1 + X2 0.49 (0.15;1.57) p = 0.23 22 0.48 (0.09;2.58) p = 0.39 317.9 0.41 (0.12;1.36) p = 0.15
X1 + X3 0.22 (0.06;0.85) p = 0.028 18 0.20 (0.03;1.17) p = 0.073 456.0 0.23 (0.05;1.00) p = 0.052
X2 + X3 0.26 (0.07;0.93) p = 0.039 23 0.19 (0.05;0.68) p = 0.011 340.8 0.26 (0.08;0.86) p = 0.028
X1 + X2 + X3 0.24 (0.06;0.93) p = 0.040 20 0.41 (0.08;2.1) p = 0.28 432.1 0.21 (0.05;0.86) p = 0.031
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