Table 2.
The logistic regression result of factors may affect cumulate live birth rate.
| Variable | B | OR | 95% CI | P |
| Female age (years) | –0.055 | 0.947 | 0.935–0.958 | <0.001 |
| Male age (years) | –0.002 | 0.998 | 0.989–1.007 | 0.679 |
| BMI of female (kg/m2) | –0.017 | 0.983 | 0.974–0.993 | 0.001 |
| Average duration of infertility (years) | –0.010 | 0.990 | 0.980–1.000 | 0.048 |
| Classification of infertility | ||||
| Tubal factor | Ref | Ref | – | <0.001 |
| Ovulatory dysfunction | –0.295 | 0.745 | 0.614–0.903 | 0.003 |
| Endometriosis | 0.216 | 1.241 | 0.927–1.663 | 0.147 |
| Confounding factor in female | –0.219 | 0.803 | 0.702–0.920 | 0.002 |
| Other female factor | –0.270 | 0.764 | 0.567–1.029 | 0.076 |
| Cofounding factor in the couple | –0.249 | 0.780 | 0.707–0.860 | <0.001 |
| Male factor only | –0.054 | 0.947 | 0.869–1.032 | 0.218 |
| Unexplained infertility | –0.109 | 0.896 | 0.780–1.029 | 0.121 |
| Duration of stimulation (days) | 0.046 | 1.047 | 1.027–1.068 | <0.001 |
| Number of gonadotropin units used | 0.000 | 1.000 | 1.000–1.000 | <0.001 |
| COH protocol | ||||
| Long protocol | Ref | Ref | – | <0.001 |
| Ultra-long protocol | 0.007 | 1.007 | 0.911–1.114 | 0.888 |
| Short protocol | –0.429 | 0.651 | 0.572–0.741 | <0.001 |
| Antagonist protocol | –0.227 | 0.797 | 0.725–0.876 | <0.001 |
| Number of oocytes retrieved | ||||
| <5 | Ref | Ref | – | <0.001 |
| 5–15 | 0.675 | 1.965 | 1.721–2.243 | <0.001 |
| >15 | 0.343 | 1.410 | 1.209–1.643 | <0.001 |
| Number of transferrable embryos | 0.141 | 1.151 | 1.140–1.162 | <0.001 |
| Constant | 1.262 | 3.533 | – | <0.001 |
BMI: Body mass index; CI: Confidence interval; COH: controlled ovarian hyperstimulation; OR: Odds ratio.