Vitamin D insufficiency among African-Americans in the southeastern United States: implications for cancer disparities (United States).

Egan KM, Signorello LB, Munro HM, Hargreaves MK, Hollis BW, Blot WJ
Cancer Causes Control. 2008 19 (5): 527-35

PMID: 18219582 · DOI:10.1007/s10552-008-9115-z

OBJECTIVE - To determine the prevalence and predictors of vitamin D insufficiency among black and white adult residents of the southern US.

METHODS - A cross-sectional analysis of serum 25(OH)D levels using baseline blood samples from 395 Southern Community Cohort Study (SCCS) participants. Participants were African-American and white adults aged 40-79 who enrolled in the study from 2002-2004. We defined hypovitaminosis D as serum 25(OH)D levels < or = 15 ng/ml.

RESULTS - Hypovitaminosis D prevalence was 45% among blacks and 11% among whites. Vitamin D intake from diet and supplements was associated with modest increases in circulating 25(OH)D (0.5-0.7 ng/ml per 100 IU increment), but hypovitaminosis D was found for 32% of blacks with intake > or = 400 IU/day. Body mass index (BMI) was a strong predictor of risk for hypovitaminosis D among black women (OR = 6.5, 95% CI 1.7-25.1 for BMI > or = 30 kg/m(2) vs. 18-24.9 kg/m(2)). UVR exposure estimated by residential location was positively associated with 25(OH)D levels among all groups except white women.

CONCLUSIONS - Hypovitaminosis D was present in a substantial proportion of the African-American population studied, even in the South and among those meeting recommended dietary guidelines. Vitamin D should continue to be a studied target for ameliorating racial cancer disparities in the US.

MeSH Terms (14)

Adult African Americans Aged Cross-Sectional Studies Female Humans Linear Models Male Middle Aged Neoplasms Prevalence Prospective Studies United States Vitamin D Deficiency

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