Table 3. Comparison of the presence of oocyte defects between the endometriosis and control groups
	Characteristics	Endometriosis (n=3172)	Other (n=24480)	P
Intra-cytoplasmic defects	Cytoplasmic granularity	14.35	14.25	0.875
	Cytoplasmic color	14.15	13.54	0.336
	Aggregates of smooth ERC	14.98	14.04	0.149
	Vacuoles in the ooplasm	14.70	15.44	0.272
	Retractile bodies	11.22	11.24	0.970
Extra-cytoplasmic defects	ZP abnormalities	22.13	18.27	< 0.001
	PVS granularity	47.91	45.70	0.017
	Large perivitelline space	28.80	24.28	< 0.001
	Fragmented PB	38.15	35.40	0.002
	Shape abnormalities	15.22	13.51	0.007
	Increased membrane resistance	15.29	14.03	0.053
	Non-resistant membrane	16.11	14.46	0.013
ERC: endoplasmic reticulum clusters, ZP: zona pellucida, PB: polar body. Chi-square and Student’s t-test. Values expressed as %.