Table 1.
Characteristics of infertility patients who conducted IVF/ICSI.
| Variable | Live birth (n = 8928) | Non-live birth (n = 9050) | Total (n = 17,978) | P |
| Female age (years) | 30.81 ± 4.05 | 33.09 ± 5.13 | 31.96 ± 4.76 | <0.001 |
| Male age (years) | 32.50 ± 5.08 | 34.65 ± 6.03 | 33.58 ± 5.68 | <0.001 |
| BMI of female (kg/m2) | 22.33 ± 3.35 | 22.75 ± 3.61 | 22.54 ± 3.48 | <0.001 |
| Average duration of infertility (years) | 4.22 ± 3.11 | 5.06 ± 4.08 | 4.65 ± 3.66 | <0.001 |
| Classification of infertility | <0.001 | |||
| Tubal factor | 3505 | 3014 | 6519 | |
| Ovulatory dysfunction | 247 | 401 | 648 | |
| Endometriosis | 126 | 115 | 241 | |
| Confounding factor in female | 585 | 747 | 1332 | |
| Other female factor | 82 | 147 | 229 | |
| Cofounding factor in the couple | 1363 | 1839 | 3202 | |
| Male factor only | 2476 | 2175 | 4651 | |
| Unexplained infertility | 544 | 612 | 1156 | |
| Preliminary gonadotropin used | <0.001 | |||
| FSH + HMG | 3397 | 4527 | 7924 | |
| FSH | 5440 | 4282 | 9722 | |
| HMG | 91 | 241 | 332 | |
| Duration of stimulation (days) | 12.07 ± 2.48 | 12.02 ± 2.67 | 12.05 ± 2.58 | 0.267 |
| Number of gonadotropin units used | 2597.86 ± 1141.70 | 3165.42 ± 1456.20 | 2883.44 ± 1339.79 | <0.001 |
| COH protocol | <0.001 | |||
| Long protocol | 4713 | 4177 | 8890 | |
| Ultra-long protocol | 1240 | 1311 | 2551 | |
| Short protocol | 755 | 1252 | 2007 | |
| Antagonist protocol | 2220 | 2310 | 4530 | |
| Number of oocytes retrieved | 15.35 ± 7.98 | 11.35 ± 7.60 | 13.34 ± 8.04 | <0.001 |
| Number of transferrable embryos | 6.66 ± 5.19 | 3.62 ± 3.51 | 10.18 ± 4.35 | <0.001 |
Data are presented as n or mean ± standard deviation. BMI: Body mass index; COH: Controlled ovarian hyperstimulation; FSH: Follicle-stimulating hormone; HMG: Human menopausal gonadotropin; ICSI: Intracytoplasmic sperm injection; IVF: In vitro fertilization.