Table 1.
Demographic Information of Patients with Live Birth Following Fresh versus Frozen Embryo Transfer (N=56,792)
| Variable | Fresh Embryo Transfer N=38,626 | Frozen Embryo Transfer N=18,166 | P-value |
|---|---|---|---|
| Maternal age | 33.4 +/- 3.9 | 34.4 +/- 4.1 | <0.001 |
| Prior gravidity | 0.96 +/- 1.3 | 1.30 +/- 1.3 | <0.001 |
| Prior full term birth | 48.5% | 61.7% | <0.001 |
| Number of prior ART cycles | 0.51 +/- 0.9 | 1.38 +/- 1.0 | <0.001 |
| Number of embryos transferred | 2.4 +/- 0.8 | 2.6 +/- 1.0 | <0.001 |
| Implantation rate | 62.6% | 51.3% | <0.001 |
| Infertility Diagnosis | |||
| Male factor | 39.4 | 37.4 | <0.001 |
| Endometriosis | 13.6 | 13.3 | NS |
| Polycystic Ovarian Syndrome | 19.0 | 20.6 | <0.001 |
| Diminished Ovarian Reserve | 5.8 | 6.3 | 0.033 |
| Tubal factor | 20.2 | 20.5 | NS |
| Unexplained | 14.2 | 12.1 | <0.001 |
| Other | 11.5 | 11.8 | NS |
| Pregnancy Plurality | |||
| Singleton | 63.2% | 76.3% | |
| Twin | 34.4% | 21.9% | OR 1.93 (1.85 – 2.02) <0.001 |
| HOMP (≥ triplet) | 2.4% | 1.8% | OR 1.59 (1.39 – 1.83) <0.001 |
| Gender of singleton infant | p=0.709 | ||
| Male | 49.6% | 49.8% | NS |
| Female | 48.8% | 48.6% | NS |
| Unknown | 1.7% | 1.5% | NS |