Reproducibility and clinical significance of pre-ovulatory serum progesterone level and progesterone/estradiol ratio on the day of human chorionic gonadotropin administration in infertile women undergoing repeated in vitro fertilization cycles

Table 3 Summary of multiple linear regression analysis for parameters associated with pre-ovulatory serum progesterone

Parameter	B	SE (B)	β	Sig.(p)
Age (years)	−0.010	0.007	−0.022	0.677
Body mass index (kg/m²)	0.000	0.011	−0.003	0.955
Number of gonadotropin ampoules used	0.003	0.003	0.076	0.234
Duration of stimulation (day)	0.025	0.021	0.069	0.244
Estradiol (pg/mL) on hCG day	6.995E-5	0.000	0.152	0.009
Number of oocytes retrieved	0.039	0.010	0.235	< 0.001
Endometrium thickness (mm)	−0.021	0.010	−0.098	0.043
R²	0.111
F	7.208*

ISSN: 1477-7827