Group I (< 40 years) (reference group) | Group II (≥ 40 years) | OR (95% CI) | |
---|---|---|---|
Fertilization rate | 3874/5042 (76.8%) | 1295/1719 (75.3%) | 0.92 (0.81 to 1.05) |
Embryo development rate | 3726/3874 (96.2%) | 1238/1295 (95.6%) | 0.86 (0.63 to 1.18) |
Blastulation rate | 1371/3726 (36.8%) | 398/1238 (32.1%) | 0.81 (0.71 to 0.93)# |