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Table 3 Comparisons of pregnancy outcomes for vitrified-warmed blastocyst transfers

From: Assisted hatching of vitrified-warmed blastocysts prior to embryo transfer does not improve pregnancy outcomes

  Assisted Hatched (n = 1986) Non-Assisted Hatched
(n = 179)
aRRª (95% CI) P-value
Conception Rate 38.7% (768) 42.1% (75) 0.90 (0.59–1.36) 0.35
Implantation Rate 26.2% 27.3% 0.76
Clinical Pregnancy Rate 29.1% (576) 30.3% (54) 0.93 (0.54–1.60) 0.34
Clinical Pregnancy Loss Rate 24.0% (121) 17.8% (8) 1.39 (0.34–5.66) 0.34
Live Birth Rate 19.9% (383) 20.5% (35) 0.98 (0.49–1.96) 0.46
Monozygotic Twinning Rate 2.1% (8) 2.9% (1) 0.49 (0.004–55.76) 0.55
  1. ªThe adjusted RRs were from generalized estimated equations (GEE) adjusted for patient clinical characteristics and woman cluster-level (multiple rounds of embryo transfer in the same patient) variation