Table 1 The results of the balance test before and after propensity score matching.
Variable | Unmatched | Mean | % Bias | % Reduct |bias| | t-test | ||
|---|---|---|---|---|---|---|---|
Mached | Treated | Control | t | p > |t| | |||
lnGDP | U | 6.823 | 6.547 | 16.100 | 70.600 | 2.200 | 0.028 |
M | 6.772 | 6.853 | −4.700 | −0.550 | 0.579 | ||
lnDTE | U | 4.548 | 4.903 | −47.300 | 93.900 | −7.690 | 0.000 |
M | 4.560 | 4.581 | −2.900 | −0.320 | 0.747 | ||
lnPAL | U | −2.687 | −1.651 | −70.400 | 96.000 | −13.430 | 0.000 |
M | −2.303 | −2.345 | 2.800 | 0.440 | 0.657 | ||
OPD | U | 100.690 | 77.629 | 36.600 | 99.600 | 7.340 | 0.000 |
M | 83.338 | 81.428 | −0.100 | −0.020 | 0.981 | ||
AML | U | 483.560 | 456.680 | 3.700 | 59.400 | 0.540 | 0.590 |
M | 506.670 | 517.590 | −1.500 | −0.170 | 0.864 | ||
