. Author manuscript; available in PMC: 2014 Jul 1.

Published in final edited form as: Arthritis Rheum. 2013 Jul;65(7):1865–1871. doi: 10.1002/art.37953

Table 3.

Mean 25-Hydroxy Vitamin D and Proportion with low 25-Hydroxy Vitamin D at the First Assessment, by Demographic Characteristics.

Characteristic	Mean (SD) Vitamin D	P-value	Number (%) with Vitamin D below 40 ng/mL	P-value
Overall	29.8 (14.8)		763 (76%)
Sex
Female (n=920)	29.7 (15.0)	0.50	698 (76%)	0.95
Male (n=86)	30.8 (13.2)		65 (76%)
Race
White (n=545)	33.2 (13.7)	<0.0001	382 (70%)	<0.0001
Black (n=377)	24.4 (14.5)	<0.0001	321 (85%)	<0.0001
Other (n=84)	32.1 (16.3)		60 (71%)
Age Group
<30 (n=157)	31.1 (16.1)	0.0042	109 (69%)
30–44 (n=349)	28.4 (14.8)	0.0042	273 (78%)	0.0070
45–49 (n=364)	29.2 (14.1)		289 (79%)
60+ (n=136)	33.5 (14.6)		92 (68%)