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Table 1 The correlation between nuclear maturation (NM) in GV, MI, and MII oocytes and zona pellucida birefringence intensity (ZP-BF)

From: Evaluation of zona pellucida birefringence intensity during in vitro maturation of oocytes from stimulated cycles

Oocyte stage Score ZP-BF Score Total
  high/positive low/negative  
GV 48 (82.8%) 10 (17.2%) 58
MI 44 (75.9%) 14 (24.1%) 58
MII 48 (82.8%) 10 (17.2%) 58
  1. Chi-squared value = 1.17 P = 0.55; Pearson's correlation coefficient r = 0.081