Table 2.
Characteristics among cleavage-stage patients according to predicted optimal day of transfer
| Predicted optimal day of transfer | p value | ||
|---|---|---|---|
| Cleavage-stage | Blastocyst | ||
| N | 269 | 562 | |
| Age (year) | 36.0 ± 4.7 | 37.8 ± 3.5 | <0.01 |
| Day 3 FSH (IU/L) | 6.9 ± 2.4 | 9.0 ± 4.2 | <0.01 |
| No. follicles ≥18 mm | 2.2 ± 1.1 | 2.6 ± 1.4 | <0.01 |
| Peak estradiol (pg/mL) | 1826 ± 752 | 1902 ± 761 | 0.18 |
| No. eggs retrieved | 11.2 ± 6.5 | 11.1 ± 6.9 | 0.88 |
| No. zygotes | 6.0 ± 3.6 | 6.1 ± 4.6 | 0.73 |
| No. GT8C embryosa | 3.3 ± 2.5 | 3.1 ± 3.2 | 0.40 |
| No. GT8CF1 embryosb | 2.4 ± 2.1 | 2.3 ± 2.5 | 0.72 |
Values represent mean ± SD. P values <0.05 are considered statistically significant and italicized
aGT8C = number of embryos with ≥8 cells on day 3
bGT8CF1 = number of embryos with ≥8 cells and fragmentation <10 % on day 3