Table 3.

Multivariate logistic analysis of factors related to premature ovulation

Factor	OR [95% CI]	P value
Age – year	0.990(0.949–1.032)	0.637
Baseline FSH (mIU/mL)	1.016(0.983–1.049)	0.353
Premature LH surge	3.157(1.983–5.025)	< 0.001
Pre-ovulatory E2/−1E2 ratio	23.283 (10.348–52.389)	< 0.001