| Table 3. Demographic and clinical data. | |||
| Study Group (double vitrification) |
Control Group (single vitrification) |
p-value | |
|---|---|---|---|
| Transferred blastocysts (n) | 381 | 780 | |
| Embryo transfers (n) | 252 | 450 | |
| Positive βHCG | 46% (116/252) |
63.3% (285/450) |
0.016 |
| Clinical pregnancy rate | 34.9% (88/252) |
52.2% (235/450) |
0.006 |
| Ongoing pregnancy rate | 31.3% (79/252) |
47.3% (213/450) |
0.012 |
| Live birth rate | 30.2% (76/252) |
45.6% (205/450) |
0.021 |
| Biochemical pregnancy rate | 24.1% (28/116) |
17.9% (51/285) |
0.248 |
| Miscarriage rate | 10.2% (9/88) |
9.4% (22/235) |
0.894 |
| Newborns (n) | 80 | 212 | |
| Mean birthweight (gr) | 2950 | 2837 | 0.459 |