Table 4.

Multivariate Linear Regression with Nap Duration (minutes) as the Outcome in LIFE-P Study for Nappers Only.^*

	Unit/Reference†	Unadjusted (N = 225)		Adjusted‡ (N = 225)		Fully adjusted model§ (N = 223)
		β	p-value	β	p-value	β	p-value
Age	Year	−.2	.62	––	––	−.07	.89
Race	White	−1.1	.82	−5.5	.26	−3.95	.44
Sex	Woman	12.2	.005*	9.4	.03*	9.00	.04*
Body Mass Index	1 SD¶ increase	.97	.003*	––	––	.81	.02*
MMSE score||	1 SD¶ decrease	1.4	.12	1.6	.09*	2.2	.03*
Diabetes (n=90)	None	16.2	.0001*	12.6	.004*	12.3	.005*

^*Only variables with a significance level of p ≤.10 in univariate, logistic regression, or linear regression models are shown here.

^†The reference group does not have the characteristic; Units for continuous variables approximate 1 standard deviation.

^‡Adjusted for sex, race, and clinical site.

^§Adjusted for sex, race, clinical site, body mass index (kg/m²), education, marital status, the Modified Mini-Mental State Examination score, Center for Epidemiologic Studies Depression score, the energy/fatigue score, the pain frequency score, and diagnosis of diabetes mellitus.

^||Mini-Mental State Exam

^¶Standard Deviation (SD)