Table 1.
Absolute Standardized Mean Difference |
Binary Covariate |
Ordinal Covariate |
Continuous Covariate |
Missing Data Pattern |
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Before | After | Before | After | Before | After | Before | After | |
SMD ≤ 0.05 | 26.32% | 21.05% | 0.00% | 0.00% | 6.67% | 15.56% | 31.82% | 2.27% |
0.050 < SMD ≤ 0.100 | 10.53% | 21.05% | 0.00% | 0.00% | 8.89% | 11.11% | 31.82% | 6.82% |
0.100 < SMD ≤ 0.125 | 5.26% | 10.53% | 0.00% | 33.33% | 4.44% | 11.11% | 20.45% | 2.27% |
0.125 < SMD ≤ 0.175 | 15.79% | 10.53% | 0.00% | 0.00% | 11.11% | 15.56% | 6.82% | 0.00% |
SMD > 0.175 | 42.11% | 36.84% | 100.00% | 66.67% | 68.89% | 46.67% | 9.09% | 88.64% |
Variance Ratio | Binary Covariate |
Ordinal Covariate |
Continuous Covariate |
Missing Data Pattern |
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Before | After | Before | After | Before | After | Before | After | |
VR ≤ 0.50 | 0.00% | 15.79% | 0.00% | 0.00% | 0.00% | 4.44% | 0.00% | 34.09% |
0.50 < VR ≤ 0.80 | 21.05% | 15.79% | 0.00% | 33.33% | 11.11% | 28.89% | 27.27% | 27.27% |
0.80 < VR ≤ 1.25 | 47.37% | 52.63% | 66.67% | 33.33% | 57.78% | 44.44% | 47.73% | 18.18% |
1.25 < VR ≤ 2.00 | 31.58% | 15.79% | 33.33% | 33.33% | 28.89% | 22.22% | 11.36% | 15.91% |
VR > 2.00 | 0.00% | 0.00% | 0.00% | 0.00% | 2.22% | 0.00% | 13.64% | 4.55% |
Note. SMD is absolute standardized mean difference. VR is variance ratio. Before is before propensity score equating (pre-existing difference). After is after propensity score equating using the weighting by the odds method.