Table 4.

Results of multiple regression analyses of testosterone and cortisol with sleep parameters.

	Slept hours		Hours in bed		Sleep efficacy (%)		Sleep quality
	Standardized-beta#	p	Standardized-beta#	p	Standardized-beta#	p	Standardized-beta#	p
Model 1
Testosterone (ng/dL)	0.13	0.081	−0.15	0.034	0.15	0.047	−0.09	0.16
Cortisol (μg/dL)	−0.12	0.15	−0.24	0.001	0.10	0.205	0.09	0.18
Model 2
Testosterone (ng/dL)	0.09	0.26	−0.02	0.73	0.08	0.30	−0.08	0.27
Cortisol (μg/dL)	−0.15	0.071	−0.14	0.042	0.05	0.55	0.10	0.15
Testosterone × Cortisol	−0.14	0.12	0.40	<0.001	−0.22	0.012	0.05	0.51
Model 3
Testosterone (ng/dL)	0.17	0.12	−0.23	0.013	0.19	0.057	−0.07	0.46
Model 4
Testosterone (ng/dL)	0.14	0.26	0.10	0.42	0.05	0.70	−0.07	0.49

# Standardized-beta was adjusted for age, body mass index, marital status, night shift, sleep disordered breathing, job demand, job control, support from supervisor, support from coworkers, and depressive symptoms.

Model 1: sleep measure is an outcome and testosterone and cortisol are explanation variables adjusted for covariates.

Model 2: sleep measure is an outcome and testosterone, cortisol, and testosterone × cortisol are explanation variables adjusted for covariates.

Model 3: sleep measure is an outcome and testosterone is an explanation variable adjusted for covariates in the low cortisol group.

Model 4: sleep measure is an outcome and testosterone is an explanation variable adjusted for covariates in the high cortisol group.