Table 6. Blastocyst formation rate according to the female age group
  Blastocyst formation rate
Maturation stage of oocyte ≤ 34 years 35-39 years ≥ 40 years p-value*
MII 38.4% 37.5% 28.6% 0.030
Rescued MI-MII 8.5% 9.7% 6.6% 0.128

* Kendall correlation