Table 4. Adjusted binary logistic regression model for the phenomenon of premature partial ovulation (PPO). Confounding factors in the first half table are serum E2 and P4 levels on the triggering day, as well as triggering with GnRH-a vs. hCG or hCG and GnRH-a; in the second half table are serum E2 levels, P4 levels ≥ 1.5 ng/ml vs. levels below this cut-off and triggering with GnRh-a. *p=0.05 was considered statistically significant. hCG = human chorionic gonadotropin. GnRH-a = gonadotropin releasing hormone agonist. E2 = estradiol. P4 = progesterone. CI = confidence interval.
	Adjusted	95% CI	p value
Odds Ratio (OR)
E2 levels triggering day	1.000	0.999 – 1.000	0.002*
P4 levels triggering day	1.940	1.297 – 2.902	0.001*
GnRH-a (vs. hCG or hCG+GnRH-a)	2.624	1.293 – 5.325	0.008*
	Adjusted Odds Ratio (OR)	95% CI	p value
E2 levels triggering day	1.000	0.999 – 1.000	0.002*
P4 ≥ 1.5 ng/ml on the triggering day (vs. P4 < 1.5 ng/ml)	4.095	1.812 – 9.256	0.001*
GnRH-a (vs. hCG or hCG+GnRH-a)	2.458	1.199 – 5.040	0.014*