| Table 2. Blastocyst formation rates depending on number of embryo blastomeres at day three. | ||||||
| Number of blastomeres | <6 | 6 | 7 | 8 | 9 | ≥10 |
| Number of embryos | 668 | 555 | 379 | 1043 | 51 | 55 |
| Blastocyst formation rate | 0.66% (a) | 20.4 % (b) | 37.9% (c) | 45.6% (d) | 50.9 % (e) | 40.0 % (f) |
a versus b p<0.00001; 95% CI 16.3 to 23.1
b versus c p<0.00001; 95% CI 11.6 to 23.4
c versus d p=0.0122; 95% CI 1.96 to 13.4
d versus e and e versus f NS
Χ2 test