Table 1.
Comparison of basic characteristics.
| Before PSM | After PSM | |||||||
|---|---|---|---|---|---|---|---|---|
| Group A | Group B | t/χ2 | P value | Group A | Group B | t/χ2 | P value | |
| n | 924 | 1984 | 915 | 915 | ||||
| Female age | 31.45 ± 4.37 | 31.51 ± 4.43 | -0.302 | 0.762 | 31.47 ± 4.36 | 31.25 ± 4.46 | 1.066 | 0.287 |
| Male age | 33.49 ± 5.26 | 33.72 ± 5.30 | -1.088 | 0.277 | 33.49 ± 5.23 | 33.43 ± 5.34 | 0.234 | 0.815 |
| Infertile duration (years) | 4.44 ± 2.93 | 4.24 ± 2.89 | 1.784 | 0.075 | 4.43 ± 2.92 | 4.14 ± 2.84 | 2.19 | 0.029 |
| Infertile type | 0.831 | 0.362 | 0.179 | 0.673 | ||||
| Primary infertility | 509/55.09% | 1057/53.28% | 504/55.08% | 496/54.10% | ||||
| Secondary infertility | 415/44.91% | 927/46.72% | 411/44.92% | 420/45.90% | ||||
| Infertile factors | 21.568 | 0.001 | 10.97 | 0.052 | ||||
| Male factor | 190/20.56% | 404/20.36% | 188/20.55% | 171/18.69% | ||||
| Tubal/pelvic factor | 301/32.58% | 735/37.05% | 298/32.57% | 332/36.28% | ||||
| Endometriosis | 14/1.52% | 5/0.25% | 14/1.53% | 3/0.33% | ||||
| Ovulation disorder | 93/10.06% | 184/9.27% | 92/10.05% | 91/9.95% | ||||
| Mixed factors | 236/25.54% | 452/22.78% | 234/25.57% | 218/23.83% | ||||
| Unexplained | 90/9.74% | 204/10.28% | 89/9.73% | 100/10.93% | ||||
| BMI (kg/m2) | 22.37 ± 3.42 | 22.28 ± 3.26 | 0.68 | 0.496 | 22.36 ± 3.40 | 22.20 ± 3.22 | 1.08 | 0.28 |
| AMH (ng/ml) | 5.59 ± 4.13 | 5.22 ± 3.72 | 2.459 | 0.014 | 5.59 ± 4.13 | 5.48 ± 3.89 | 0.559 | 0.576 |
| Basal FSH level (IU/L) | 6.11 ± 2.39 | 5.91 ± 2.11 | 2.247 | 0.025 | 6.07 ± 2.29 | 6.03 ± 2.28 | 0.423 | 0.672 |
| AFC (n) | 22.97 ± 10.17 | 22.20 ± 9.48 | 1.944 | 0.047 | 22.97 ± 10.17 | 22.99 ± 10.28 | -0.053 | 0.958 |
| Source of sperm | 0.624 | 0.43 | 1.028 | 0.311 | ||||
| Husband’s | 895/96.86% | 1932/97.38% | 887/96.94% | 894/97.70% | ||||
| Sperm bank | 29/3.14% | 52/2.62% | 28/3.06% | 21/2.30% | ||||
PSM, propensity score matching; BMI, body mass index; AMH, anti-Mullerian hormone; FSH, follicular stimulating hormone; AFC, antral follicle counting.