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Table 5 Comparison of pregnancy outcomes for single embryo transfers with expansion grade of ≤3

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

  Assisted Hatched (n = 755) Not Assisted Hatched (n = 61) aRRª (95% CI) P-value
Conception Rate 32.5% (245) 44.3% (27) 0.43 (0.23–0.84) 0.01
Implantation Rate 24.4% 34.4% 0.12
Clinical Pregnancy Rate 24.0% (181) 32.8% (20) 0.38 (0.17–0.87) 0.02
Clinical Pregnancy Loss Rate 17.9% (29) 11.8% (2) 2.54 (0.15–42.00) 1.00
Live Birth Rate 17.6% (130) 22.4% (13) 0.47 (0.16–1.40) 0.17
  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