Table 3 Analysis of propensity score
Factor | β (CI95%) | OR (CI95%) | t | P | VIF |
|---|---|---|---|---|---|
Before | |||||
 Intercept | 0.61 (−1.69,2.90) | 1.84 (0.18,18.26) | 0.520 | 0.610 | – |
 Age | 0.02 (0.01,0.04) | 1.02 (1.01,1.04) | 2.870 | <0.001 | 2.450 |
 Sex | −1.64 (− 1.90,-1.38) | 0.19 (0.15,0.25) | −12.360 | <0.001 | 1.050 |
 Ethnic | −0.15 (− 0.39,0.09) | 0.86 (0.68,1.10) | −1.190 | 0.230 | 1.030 |
 Educational level | − 0.03 (− 0.14,0.09) | 0.97 (0.87,1.09) | − 0.480 | 0.630 | 1.270 |
 Working years | 0.03 (0.02,0.05) | 1.03 (1.02,1.05) | 5.150 | <0.001 | 2.550 |
 Sign labor contract | −1.62 (−3.70,0.45) | 0.20 (0.02,1.58) | − 1.530 | 0.130 | 1.000 |
 Professional title | −0.02 (− 0.09,0.05) | 0.98 (0.92,1.05) | − 0.560 | 0.580 | 1.040 |
 Work shift | 0.07 (−0.03,0.16) | 1.07 (0.97,1.17) | 1.410 | 0.160 | 1.230 |
 Working time per day | 0.05 (−0.15,0.24) | 1.05 (0.86,1.27) | 0.460 | 0.640 | 1.160 |
 Working days per week | 0.05 (−0.14,0.24) | 1.05 (0.87,1.27) | 0.510 | 0.610 | 1.030 |
 Marital status | 0.18 (−0.04,0.40) | 1.20(0.96,1.49) | 1.630 | 0.100 | 1.090 |
 Monthly income | −0.09 (− 0.22,0.03) | 0.91 (0.80,1.03) | −1.460 | 0.140 | 1.160 |
After | |||||
 Intercept | −13.26 (− 649.75,623.23) | 0.00 (0.00,4.6e+ 270) | − 0.040 | 0.970 | – |
 Age | 0.02 (0.00,0.04) | 1.02 (1.00,1.05) | 2.190 | 0.030 | 2.770 |
 Sex | 0.12 (−0.24,0.47) | 1.13 (0.79,1.60) | 0.650 | 0.520 | 1.050 |
 Ethnic | −0.01 (− 0.29,0.28) | 0.99 (0.75,1.32) | −0.050 | 0.960 | 1.020 |
 Educational level | 0.01 (−0.12,0.14) | 1.01 (0.89,1.15) | 0.130 | 0.900 | 1.260 |
 Working years | −0.01 (− 0.03,0.01) | 0.99 (0.97,1.01) | −1.100 | 0.270 | 2.780 |
 Sign labor contract | 12.6 (−623.89,649.08) | 296,558.57 (0.00,7.83e+ 281) | 0.040 | 0.970 | 1.000 |
 Professional title | 0 .00(−0.08,0.08) | 1.00 (0.93,1.08) | 0.080 | 0.940 | 1.030 |
 Work shift | 0.04 (−0.06,0.15) | 1.04 (0.94,1.16) | 0.800 | 0.420 | 1.220 |
 Working time per day | 0.02 (−0.21,0.24) | 1.02 (0.81,1.27) | 0.140 | 0.890 | 1.150 |
 Working days per week | 0.01 (−0.21,0.23) | 1.01 (0.81,1.25) | 0.090 | 0.930 | 1.030 |
 Marital status | −0.23 (− 0.47,0.02) | 0.79 (0.62,1.02) | −1.810 | 0.070 | 1.050 |
 Monthly income | 0.02 (−0.13,0.16) | 1.02 (0.88,1.18) | 0.220 | 0.820 | 1.110 |