Table 3. Association of oocyte dimorphisms risk with letrozole group compared to control group (as reference, OR 1.0)
Parameters	OR	CI 95%	p value*
Increased Perivitelline Space	1.4	1.1 - 1.7	0.007
Irregular ZP	3.7	2.4 - 5.5	< 0.001
Refractile Bodies	1.4	1.2 - 1.8	< 0.001
Dark Ooplasm	2.3	1.8 - 2.9	< 0.001
Granular Ooplasm	1.7	1.4 - 2.2	< 0.001
Irregular Ooplasm	9.8	5.6 - 17.2	< 0.001
Dense Central Granulation	2.1	1.3 - 3.3	< 0.001
OR, Odds Ratio; CI, confidence interval;ZP, Zona pellucida;ER, Endoplasmic Reticle. * Significantly different if p<0.05 (Logistic regression)