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Table 4 Comparisons of pregnancy outcomes for single embryo transfers with expansion grade of 4

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

  Assisted Hatched (n = 680) Not Assisted Hatched (n = 62) RR (95% CI) P-value
Conception Rate 39.3% (267) 37.1% (23) 1.06 (0.76–1.48) 0.79
Implantation Rate 31.0% 25.8% 0.38
Clinical Pregnancy Rate 30.0% (204) 25.8% (16) 1.16 (0.75–1.80) 0.56
Clinical Pregnancy Loss Rate 28.8% (53) 15.4% (2) 1.87 (0.51–6.84) 0.52
Live Birth Rate 18.9% (125) 15.3% (9) 1.24 (0.67–2.31) 0.60