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Table 4 Neonatal outcome of open and closed vitrification for singletons and twins respectively
| Singletons | Twins | |||||
|---|---|---|---|---|---|---|
| Open vitrification (n = 30) | Closed vitrification (n = 60) | P value | Open vitrification (n = 11) | Closed vitrification (n = 10) | P value | |
| Gestational age (wks) | 38.3 ± 1.3 | 37.9 ± 1.5 | 0.175 | 37.2 ± 1.4 | 37.4 ± 1.5 | 0.844 |
| GA < 37 weeks | 2/30 (6.7) | 9/60 (15.0) | 0.426 | 4/11 (36.4) | 4/10 (40) | 1.000 |
| GA ≥ 42 weeks | 1/30 (3.3) | 2/60 (3.3) | 1.000 | 0 | 0 | |
| Birth weight (g) | 3248 ± 408 | 3163 ± 481 | 0.410 | 2800 ± 380 | 2598 ± 364 | 0.091 |
| <2500 g | 1/30 (3.3) | 5/60 (8.3) | 0.654 | 3/11 (27.3) | 4/10 (40) | 0.659 |
| ≥4000 g | 3/30 (10.0) | 7/60 (11.7) | 0.813 | 0 | 0 | |
| Birth length (cm) | 49.7 ± 1.6 | 50.4 ± 1.3 | 0.086 | 48.8 ± 1.6 | 48.9 ± 1.7 | 0.858 |
