Parameter | synchronous (n = 225) (40.3%) | Unsynchronized (n = 130) (23.3%) | Mixed (n = 203) (36.4%) | P |
Women’s age (years) (mean ± SD) | 30.8 ± 5.5 | 30.2 ± 5.4 | 29.9 ± 5.1 | NS |
Primary infertility (%) | 123 (55.2%) | 69 (53.1%) | 125 (61.9%) | NS |
Cryopreservation of day 2 embryos (%) | 202 (90.6%) | 10 (7.7%) | 128 (63.4%) | P < 0.0001 (S vs U) P < 0.0001 (S vs M) P < 0.0001 (U vs M) P < 0.0001 |
Number of cryopreserved/thawed embryo per cycle (mean ± SD) | 2.7 ± 1 | 3.0 ± 1.2 | 3.5 ± 1.2 | P < 0.0001 (S vs U) P < 0.026 (S vs M) P < 0.0001 (U vs M) P < 0.0001 |
Number of transferred embryos (mean ± SD) | 2.0 ± 0.8 | 2.2 ± 1 | 2.5 ± 0.9 | P < 0.0001 (S vs U) NS (S vs M) P < 0.0001 (U vs M) P < 0.01 |