Risk factors for vitamin D deficiency among veterans with and without HIV infection

Abstract

Objectives: We aimed to describe and compare the prevalence of vitamin D deficiency between HIV-negative and HIV-infected veterans in the southern United States, and to determine risk factors for vitamin D deficiency for HIV infected patients. Methods: Cross-sectional, retrospective study including all patients followed at the Atlanta VA Medical Center with the first 25-hydroxyvitamin D [25(OH)D] level determined between January 2007 and August 2010. Multivariate logistic regression analysis was used to determine risk factors associated with vitamin D deficiency (< 20 ng/ml). Results: There was higher prevalence of 25(OH)D deficiency among HIV-positive compared to HIV-negative patients (53.2 vs. 38.5%, p <0.001). Independent risk factors for vitamin D deficiency in HIV + patients included black race (OR 3.24, 95% CI 2.28-4.60), winter season (OR 1.39, 95% CI 1.05-1.84) and higher GFR (OR 1.01, CI 1.00-1.01); increasing age (OR 0.98, 95% CI 0.95-0.98), and tenofovir use (OR 0.72, 95% CI 0.54-0.96) were associated with less vitamin D deficiency. Conclusions: Vitamin D deficiency is a prevalent problem that varies inversely with age and affects HIV-infected patients more than other veterans in care. In addition to age, tenofovir and kidney disease seem to confer a protective effect from vitamin D deficiency in HIV-positive patients.