Table 2.

A model to predict clinical vs biochemical pregnancy outcome depending on women’s parameters.

Variable	Odds ratio	95% Confidence interval	P-value
Body mass index, kg/m2	1.1	1.01–1.271	0.023
Last measured estradiol, pg/mL	1	0.999–1.0	0.35
Age, years	0.996	0.908–1.093	0.93
Endometrial thickness, mm (last measurement)	1.07	0.803–1.401	0.64
First β-hCG, mIU/mL	1.02	1.006–1.018	<0.001
2-day Δ β-hCG	4.29	2.04–9.05	<0.001