Assisted Hatched (n = 1986) | Non-Assisted Hatched (n = 179) | P-valueª | |
---|---|---|---|
Mean maternal age at retrieval | 33.8 ± 3.9 | 33.1 ± 3.7 | 0.03 |
Mean maternal age at transfer | 35.3 ± 4.0 | 34.6 ± 4.0 | 0.02 |
Cause of infertility | |||
Ovulatory disorder | 14.2% (283) | 17.9% (32) | 0.18 |
Tubal factor | 30.5% (606) | 32.3% (58) | 0.54 |
Endometriosis | 7.0% (139) | 7.3% (13) | 0.89 |
Male Factor | 34.5% (686) | 34.1% (62) | 0.97 |
Other | 30.4% (604) | 24.7% (45) | 0.16 |
Endometrial preparation protocol | |||
Natural Cycle | 11.2% (223) | 13.7% (25) | 0.31 |
Hormone Replacement Therapy | 88.8% (1764) | 86.0% (154) | 0.31 |
Number of embryos transferred per cycle | |||
1 | 74.1% (1474) | 69.8% (125) | 0.24 |
2 | 25.5% (506) | 30.2% (54) | 0.16 |
3 | 0.3% (6) | 0.0% (0) | 0.91 |
4 | 0.1% (2) | 0.0% (0) | 0.61 |
Previous transfers (Fresh & Vitrified-warmed) | |||
0 | 14.4% (287) | 13.7% (25) | 0.80 |
1 | 34.8% (692) | 34.6% (63) | 0.97 |
2 | 22.5% (444) | 17.2% (37) | 0.08 |
3 | 13.5% (269) | 13.7% (23) | 0.24 |
> 4 | 15.0% (296) | 16.8% (31) | 0.40 |