Table 3.
Comparison of the clinical outcomes from 1 high-quality plus 1 fair-quality embryo per transfer.
| ≤35 years (average age 29.92 years) | 36–37 years (average age 36.44 years) | ≥38 years (average age 40.36 years) | P value | |
| Embryo transfer cycles | 1576 | 126 | 189 | |
| Duration of infertility (yrs) | 3.9 ± 0.2 | 5.7 ± 0.9 | 8.1 ± 1.4 | <.001 |
| Embryos from ICSI | 556 (35.3%) | 45 (35.7%) | 69 (36.5%) | .944 |
| Endometrium thickness (mm) | 9.4 ± 0.0 | 9.2 ± 0.2 | 9.1 ± 0.1 | .018 |
| Pregnancy rate per cycle | 963 (61.1%) | 61 (48.4%) | 67 (35.4%) | <.001 |
| Implantation rate per cycle | 1230 (39.0%) | 76 (30.8%) | 86 (22.8%) | <.001 |
| Live birth rate per cycle | 867/1576 (55.0%) | 55/126 (43.7%) | 57/189 (30.2%) | <.001 |
| Multi pregnancy rate (%) | 236/867 (27.2%) | 14/55 (25.5%) | 10/57 (17.5%) | .272 |
| Gestational days (d) | 263.7 ± 1.3 | 265.3 ± 2.5 | 268.7 ± 4.2 | .68 |
| Neonatal weight (g) | 3077.2 ± 26.9 | 3101.7 ± 140.7 | 3094.0 ± 131.8 | .005 |
| Preterm birth (<37 wks) | 108/867 (12.5%) | 8/55 (14.5%) | 14/57 (24.6%) | .032 |
ICSI = intracytoplasmic sperm injection.