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Table 2 Status on maturation, fertilization and development of failed-matured oocytes that survived cryopreservation

From: Cryopreservation of human failed-matured oocytes followed by in vitro maturation: vitrification is superior to the slow freezing method

  Viable GV Oocytes Viable MI Oocytes
  Slow-freezing Vitrification Slow-freezing Vitrification
No. of oocytes matured in vitro (%) 31 (21.2) total 102 (54.0)* total
  10 (16.7) 21 (24.4) 30 (50.8) 72 (55.4)
No. of fertilized (%) 4 (12.9) total 60 (58.8)* total
  0 (0.0) 4 (19.0) 12 (36.0) 44 (61.1)
No. of cleaved (%) 0 (0.0) total 24 (40.0) total
  0 (0.0) 0 (0.0) 2 (16.7) 22 (50.0)**
No. of blastocysts formed (%) 0 (0.0) total 5 (20.8) total
  0 (0.0) 0 (0.0) 0 (0.0) 5 (22.7)
  1. *Significantly different between the GV and MI oocytes that survived (P < 0.01)
  2. ** Significantly different between the slow-freezing and vitrification groups (P < 0.05)