Gender Differences in the Association between Sleep Duration and Body Composition: The Cardia Study

Table 3

Multivariate models for predictors of body mass index in the CARDIA study stratified by gender (𝛽,95%CI)¹.

Variable	Men			Women
	Model 1	Model 2	Model 3	Model 1	Model 2	Model 3
Sleep (h)	−0.20	−0.20	−0.14	−0.33	−0.29	−0.17
	(−0.40,0.002)	(−0.41,0.01)	(−0.34,0.07)	(−0.53,−0.13)^∗	(−0.50,−0.09)^∗	(−0.37,0.02)
Age (yrs)	0.003	0.004	−0.02	0.12	0.13	0.12
	(−0.06,0.07)	(−0.07,0.07)	(−0.09,0.05)	(0.05,0.20)^∗	(0.06,0.20)^∗	(0.05,0.19)^∗
Race	−0.72	−1.17	−1.40	−4.49	−3.28	−3.14
(White versus Black)	(−1.23,−0.22)^∗	(−1.72,−0.62)^∗	(−1.94,−0.86)	(−5.03,−3.94)^∗	(−3.88,−2.68)^∗	(−3.72,−2.57)^∗
Current smoker		−1.54	−1.54		−0.47	−0.50
(Yes versus No)		(−2.18,−0.89)^∗	(−2.17,−0.91)^∗		(−1.17,0.23)	(−1.17,0.18)
Number		−0.06	−0.06		−0.09	−0.06
drinks/week		(−0.10,−0.03)^∗	(−0.09,−0.02)^∗		(−0.15,−0.03)^∗	(−0.11,0.0005)
Education (yrs)		−0.12	−0.15		−0.32	−0.30
		(−0.23,−0.009)^∗	(−0.26,−0.04)^∗		(−0.44,−0.19)^∗	(−0.42,−0.18)^∗
Income		0.20	0.21		−0.33	−0.25
(ordinal 1–9)		(0.04,0.35)^∗	(0.06,0.36)		(−0.47,−0.18)^∗	(−0.40,−0.11)^∗
Work full-time		−0.06	0.18		0.65	0.71
(Yes versus No)		(−0.83,0.71)	(−0.57,0.93)		(0.08,1.21)^∗	(0.17,1.25)
Physical activity			−1.04			−1.57
			(−1.27,−0.81)^∗			(−1.80,−1.33)^∗

1Beta (β) coefficients reported are unstandardized estimated regression coefficients calculated using predictor variables after they have been transformed and then rescaled via linear transformations to their original mean and variance.
^∗𝑃<.05.