Table 1.
Baseline patient clinical characteristics and embryo implantation potential of thawed embryos vitrified with a closed or open vitrification system in hormone-replacement cycles
| Closed vitrification | Open vitrification | P-value | |
|---|---|---|---|
| Age (years, mean ± SE) | 35.6 ± 0.2 (n = 313) | 36.0 ± 0.2 (n = 561) | 0.168 |
| Proportion of ICSI cycles | 61.3 % (n = 313) | 61.7 % (n = 561) | 0.923 |
| Mean no. of previous embryo transfer | 1.3 ± 0.1 (n = 313) | 1.5 ± 0.1 (n = 561) | 0.068 |
| Proportion of day-5 blastocysts | 76.5 % (n = 313) | 73.8 % (n = 561) | 0.397 |
| Blastocyst quality score | 19.8 ± 0.5 (n = 313) | 19.6 ± 0.4 (n = 561) | 0.678 |
| Survival rate after vitrification | 96.5 % (n = 313) | 96.1 % (n = 561) | 0.762 |
| Endometrial thickness (mm) | 11.0 ± 0.1 (n = 302) | 10.9 ± 0.1 (n = 539) | 0.138 |
| Implantationa | 49.7 % (n = 302) | 49.4 % (n = 539) | 0.889 |
a Implantation was determined by the detection of a single intrauterine gestational sac