Table 2.
Basic characteristics with EP
| IUP | EP | P value | |
|---|---|---|---|
| Total | 7,121 | 128 | |
| Age (y) | 30.39 ± 4.21 | 30.34 ± 4.12 | 0.91 |
| Body mass index (BMI) (kg/m2) | 23.08 ± 3.21 | 23.20 ± 3.39 | 0.68 |
| Basal FSH (IU/L) | 7.61 ± 75.88 | 7.10 ± 2.64 | 0.94 |
| E2 on hCG day (pg/mL) | 2876.79 ± 1375.70 | 2844.90 ± 1696.07 | 0.85 |
| P on the day before ET (ng/mL) | 98.05 ± 34.53 | 92.39 ± 34.82 | 0.13 |
| Infertility factors | |||
| Tubal factor | 3,449 (48.43%) | 82 (64.06%) | 0.00 |
| Polycystic ovary syndrome (PCOS) | 837 (11.75%) | 8 (6.25%) | 0.07 |
| Ovarian dysfunction | 208 (2.92%) | 1 (0.78%) | 0.28 |
| Male factor | 625 (8.78%) | 6 (4.69%) | 0.14 |
| Unexplained and others | 2,002 (28.11%) | 31 (24.22%) | 0.38 |
| Endometrial thickness (mm) | 12.54 ± 2.59 | 11.68 ± 2.66 | 0.00 |
| Fertilization method | 0.01 | ||
| IVF | 5,452 (76.56%) | 111 (86.72%) | |
| ICSI | 1,669 (23.44%) | 17 (13.28%) | |
| Stage of embryo transferred | 0.19 | ||
| day 3 embryo | 5,160 (72.46%) | 100 (78.13%) | |
| day 5 embryo | 1,961 (27.54%) | 28 (21.87%) | |
| The number of embryos transferred | 0.15 | ||
| 1 | 2,520 (35.39%) | 37 (28.91%) | |
| 2 | 4,601 (64.61%) | 91 (71.09%) | |
| The number of cycles | 1.00 | ||
| 1 | 6,425 (90.23%) | 115 (89.84%) | |
| ≥ 2 | 696 (9.77%) | 13 (10.16%) | |
| laboratory indicators | |||
| Egg count | 13.34 ± 5.60 | 13.13 ± 6.43 | 0.71 |
| MII rate | 0.83 ± 0.15 | 0.83 ± 0.15 | 0.81 |
| 2PN rate | 0.68 ± 0.18 | 0.65 ± 0.19 | 0.09 |
| High-quality embryo rate | 0.72 ± 0.24 | 0.71 ± 0.25 | 0.69 |
| Blastocyst formation rate | 0.53 ± 0.33 | 0.49 ± 0.33 | 0.11 |
FSH Follicle-stimulating hormone, IVF in vitro fertilization, ICSI Intracytoplasmic sperm injection. Bold: p < 0.05. P < 0.05 was considered to be statistically significant