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Table 2 IVF cycle characteristics for pregnant versus non-pregnant patients

From: Lessons from elective in vitro fertilization (IVF) in, principally, non-infertile women

  Pregnant Not pregnant
Percent of total cycles 36.7 63.3
Age (years) 36.5 ± 5.3 37.0 ± 4.6
Embryos biopsied (n) 7.7 ± 3.7 7.0 ± 3.8
 ≤ 6 n (%) 20 (50.0) 35 (50.7)
 ≥ 7 n (%) 20 (50.0) 34 (49.3)
Euploid embryos (n) 1 4.5 ± 2.4 3.3 ± 2.2
 ≤ 3 n (%) 16 (40.0) 42 (60.9)
  % pregnant 27.6  
 ≥ 4 n (%) 24 (60.0) 27 (39.1)
  % pregnant 47.1  
Embryos transferred (n) 2.1 ± 0.7 1.6 ± 0.8
≥ 2 euploid embryos available 2   
 n (%) pregnant ET x 1 4/35 (11.4)  
 n (%) pregnant ET x 2 36/74 (48.6)  
  1. Pregnant and non-pregnant women neither differed in age nor in number of embryo biopsied. 1Logistic regression for pregnancy, adjusted for age and depending on whether ≥4 or ≤3 euploid embryo were present in cycle, adjusted by number of embryos biopsied and transferred, demonstrated over 3 fold pregnancy odds in women who had ≥ 4 euploid embryos (95% CI 1.224 to 9.201, Exp 3.356, P = 0.019). 2Logistic regression analysis, adjusted for age cycle number, euploid embryos and depending on whether ≤1 or ≥2 euploid embryo were transferred demonstrated 6.553-times the odds of pregnancy with transfer of ≥2 embryos (95 CI 1.979 to 21.695, Exp 6,553, P = 0.002).