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Table 4 Neonatal outcome of open and closed vitrification for singletons and twins respectively

From: Neonatal outcomes after the transfer of vitrified blastocysts: closed versus open vitrification system

  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
  1. Values are mean ± SD or n/total (%).