| Table 2. Baseline characteristics of study and control groups. | |||
| Study Group (double vitrification) |
Control Group (single vitrification) |
p-value | |
|---|---|---|---|
| Patients (n) | 252 | 450 | |
| Female patient mean age (at oocyte retrieval) |
33.3 (±5.7) | 32.1 (±6.7) | 0.007 |
| Transferred blastocysts (n) | 381 | 780 | |
| Good quality blastocysts | 304 (80%) | 680 (87%) | 0.001 |
| Mean number of embryos per ET | 1.51 (±0.59) | 1.73 (±0.51) | 0.028 |
| Newborns | 80 | 212 | |