Table 8.

Multivariate logistic regression for study variables impacting postoperative night time serum melatonin

Variable	Coefficient	p	R square	F	p
Estrogen receptors	0.7	0.8	0.22	2.6	0.026
Progesterone receptors	0.32	0.3
Her/neu receptors	0.04	0.04
Depression severity	0.06	0.8
Insomnia	−0.015	0.7
Sleepiness	−0.014	0.9
Chronotype	0.37	0.025

Note: Bold value indicate statistical significance.