Table 1.
Clinical features in cycles with and without the incidence of 0PN embryos
| Characteristic | Patients with 0PN | Patients without 0PN | χ 2/t | P value |
|---|---|---|---|---|
| Number of cycles | 1899 | 2525 | ||
| Age (years) | 31.44 ± 5.35 | 32.52 ± 5.77 | 6.39 | 0.00 |
| Basal FSH (IU/L) | 6.87 ± 2.79 | 7.39 ± 3.80 | 5.34 | 0.00 |
| BMI | 22.59 ± 2.86 | 22.54 ± 2.96 | −0.48 | 0.63 |
| Cause of infertility | ||||
| Male factor | 122 | 185 | 1.37 | 0.26 |
| Ovulation factor | 102 | 129 | 0.15 | 0.70 |
| Tubal factor | 997 | 1326 | 0.00 | 0.99 |
| Unexplained infertility | 85 | 107 | 0.15 | 0.70 |
| Combined factor | 589 | 774 | 0.07 | 0.80 |
| Other | 4 | 4 | 0.16 | 0.69 |
| Primary infertility | 831 | 1079 | 0.47 | 0.50 |
| Secondary infertility | 1068 | 1446 | 0.47 | 0.50 |
| No. of oocytes/cycle | 11.38 ± 6.52 | 8.84 ± 6.27 | 13.15 | 0.00 |
| Rate of 2pn (%) | 57.3 (12402/21628) | 70.0 (15621/22321) | 759.67 | 0.00 |
| Rate of top-quality embryos (%) | 55.7 (6905/12402) | 50.4 (7876/15621) | 76.66 | 0.00 |
| No. of embryo transferred | 2.05 ± 0.42 | 2.01 ± 0.46 | 2.84 | 0.01 |
| Clinical pregnancy rate (%) | 45.7 (558/1222) | 45.8 (728/1591) | 0.00 | 0.96 |
| Miscarriage rate (%) | 8.8 (108/1222) | 10.9 (174/1591) | 3.37 | 0.07 |
| Live-birth rate (%) | 36.7 (449/1222) | 34.7 (552/1591) | 1.27 | 0.26 |