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Results of balance tests of explanatory variables before and after PSM
| Matching method | P-value | Pseudo R2 | LR Chi2 | Mean-bias | Med-bias |
|---|---|---|---|---|---|
| Unmatched | 0.000 | 0.079 | 1100.68 | 15.1 | 12.6 |
| K-nearest matching (K = 1) | 0.940 | 0.003 | 19.81 | 2.1 | 1.4 |
| K-nearest matching (K = 4) | 1.000 | 0.001 | 7.25 | 1.1 | 0.9 |
| Caliper matching (caliper = 0.01) | 1.000 | 0.000 | 1.34 | 0.5 | 0.4 |
| Kernel matching | 1.000 | 0.001 | 7.33 | 1.6 | 1.2 |
