Table 4.

Association between current levels of sun exposure variables and measured serum 25(OH)D, controlling for the contribution of other dietary and demographic predictors of serum 25(OH)D, Rochester, New York, 2005–2007.

Variable	Variable type	Level	All subjects		Controls only
			β	p valuea	β	p valuea
Intercept	--	--	15.4		15.5
Sunbathing, past 4 wks	ordinal	--	2.8	0.01	2.7	0.04
Sun exposure, past 4 wks	categorical	0–2 hrs/wk	ref	0.01	ref	0.02
		3–5 hrs/wk	−2.8		−4.3
		6–8 hrs/wk	−1.4		−3.7
		>8 hrs/wk	1.2		−0.02
Tanning bed use, past 4 wks	yes/no	Yes	13.9	0.0004	11.7	0.006
Current daily multivitamin	yes/no	Yes	5.9	<0.0001	5.3	0.0002
Current milk servings per wk	ordinal	--	1.31	0.02	1.7	0.02
Current fatty fish servings per wk	categorical	0/wk	ref	0.02	ref	0.07
		<1/wk	3.8		3.5
		1–2/wk	−1.3		−2.6
		≥3/wk	1.9		−0.9
Current BMI	continuous	--	−0.2	0.005	−0.2	0.02
Race	categorical	White	ref	<0.0001	ref	0.03
		Black	−9.5		−7.5
		Other	−2.5		−1.3
Age	continuous	--	0.06	0.07	0.1	0.02
Season of blood draw	Ordinal (winter, ref; spring/fall, summer)	--	2.8	<0.0001	2.7	0.002

^aThe p values in the table above are the overall global p-value for each variable from multivariable linear regression models including all variables shown.