Table 4. Influence of the morphological quality of the blastocyst on the risk of embryonic aneuploidy
  Type Euploid Group % (N) Aneuploid Group % (N) p* OR p
Degree of expansion 2 45.4% (124) 54.6% (149) 0.215  
3 49.3% (69) 50.7% (71)
4 77.7% (7) 22.2% (2)
Trophectoderm A 63.5% (54) 36.5% (31) <0.001 2.5 (1.5-4.1)
4.0 (2.1-7.4)
<0.001
<0.001
B 48.9% (116) 51.1% (121)
C 30.3% (30) 69.7% (69)
Inner cell mass A 54.1% (72) 45.9% (61) 0.117 1.7 (1.1-3.0) 0.048‡
B 45.9% (95) 54.1% (112)
C 40.2% (33) 59.8% (49)
Biopsy day D5 51.7% (76) 48.3% (71) 0.247  
D6 45.1% (123) 54.9% (150)

*Chi-squared test
Risk of aneuploidy: (TYPE A + TYPE B) x (TYPE C)
Risk of aneuploidy: (TYPE A) x (TYPE C)