Table 6.

Multivariate logistic regression for study variables impacting the preoperative serum melatonin

Variable	Coefficient	p	R Square	F	P
Estrogen receptors	0.3	0.032	0.132	1.8	0.1
Progesterone receptors	0.1	0.95
Her/neu receptors	−0.06	0.39
Depression severity	0.34	−0.05
Insomnia	0.06	0.7
Sleepiness	0.02	0.9
Chronotype	0.27	0.12

Note: Bold value indicate statistical significance.