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The correlation between nuclear maturation (NM) in GV, MI, and MII oocytes and zona pellucida birefringence intensity (ZP-BF)
| 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 |
Chi-squared value = 1.17 P = 0.55; Pearson's correlation coefficient r = 0.081
