Table 3.

Logistic regression analysis for sleep duration.

Independent variables		Odds ratio	95% CI	P valuea
Sex		1.78	1.22-2.59	<.001
Age		1.03	1.01-1.04	<.001
Sleep duration, hours
	≤6	Reference
	7	1.10	0.71-1.71	.68
	8	1.22	0.75-2.00	.43
	≥9	0.57	0.18-1.81	.34

^a Statistical significance (P<.05).