Table 1 Characteristics of basic clinical data.
≤ 35 years of age | ≥ 36 years of age | Statistic | P value | OR (95% CI) | |
|---|---|---|---|---|---|
No. of stimulation cycle, n (%) | 14,567 (81.2%) | 3364 (18.8%) | |||
Age–the time of oocytes retrieval (meanII ± SD) | 29.9 ± 3.0 | 38.8 ± 2.6 | − 172.26 | < 0.001 | |
D3 FSH level (IU/L) (mean ± SD) | 7.1 ± 2.6 | 8.4 ± 3.4 | − 18.841 | < 0.001 | |
D3 E2 level (ng/L) (mean ± SD) | 41.0 ± 28.2 | 43.0 ± 27.4 | − 3.597 | < 0.001 | |
D3 LH level (IU/L) (mean ± SD) | 4.8 ± 4.5 | 4.3 ± 4.7 | 4.982 | < 0.001 | |
Infertility factor, n (%) | 384.92 | < 0.001 | |||
Tubal factor | 9384 (64.4%) | 2260 (67.2%) | 0.884 (0.817–0.958) | ||
Endometriosis | 675 (4.6%) | 102 (3.0%) | |||
Ovulatory disorder | 630 (4.3%) | 49 (1.5%) | |||
Diminished ovarian reserve | 532 (3.7%) | 358 (10.6%) | |||
Male factor | 2463 (16.9%) | 418 (12.4%) | |||
Unexplained | 883 (6.1%) | 177 (5.3%) | |||
Duration of infertility (years) (mean ± SD) | 3.3 ± 2.3 | 5.0 ± 4.0 | − 22.371 | < 0.001 | |
Stimulation protocol, n (%) | 1759.592 | < 0.001 | |||
Long protocol | 8295 (56.9%) | 881 (26.2%) | 3.727 (3.429–4.052) | ||
Short protocol | 1625 (11.2%) | 764 (22.7%) | |||
Ultralong protocol | 1380 (9.5%) | 241 (7.2%) | |||
Micro-stimulation protocol | 771 (5.3%) | 751 (22.3%) | |||
Others | 2496 (17.1%) | 727 (21.6%) | |||
Duration of stimulation (day) (mean ± SD) | 9.8 ± 2.0 | 8.7 ± 2.7 | 21.851 | < 0.001 |
