Table 2.
Clinical characteristics of the first cycle
| Characteristic | <30 years n = 1375 | 30–<35 years n = 3862 | 35–<40 years n = 4279 | 40–42 years n = 1845 | P value |
|---|---|---|---|---|---|
| Fresh cycles | 1375 (100.0) | 3862 (100.0) | 4279 (100.0) | 1845 (100.0) | – |
| Manipulation | |||||
| ICSIa | 503 (36.6) | 1181 (30.6) | 1086 (25.4) | 369 (20.0) | <0.001 |
| Assisted hatching | 5 (0.4) | 32 (0.8) | 118 (2.8) | 190 (10.3) | <0.001 |
| Oocytes retrieveda | 13.3 ± 8.0 | 11.9 ± 6.9 | 10.2 ± 6.7 | 8.6 ± 5.9 | <0.001 |
| Embryos cryopreserveda | <0.001 | ||||
| 0 | 607 (48.2) | 1800 (51.1) | 2348 (64.1) | 1182 (81.7) | |
| 1–3 | 271 (21.5) | 735 (20.9) | 674 (18.4) | 136 (9.4) | |
| ≥4 | 381 (30.3) | 985 (28.0) | 641 (17.5) | 128 (8.9) | |
| Embryos transferredb | 1.8 ± 0.7 | 1.8 ± 0.7 | 2.0 ± 1.0 | 2.7 ± 1.5 | <0.001 |
Data are presented as mean ± standard deviation or n (%)
ICSI intracytoplasmic sperm injection
aCalculated only among fresh cycles
bCalculated among all cycles