Rebeccah A McKibben1, Di Zhao1, Pamela L Lutsey1, Andrea L C Schneider1, Eliseo Guallar1, Thomas H Mosley1, Erin D Michos1. 1. Department of Medicine (R.A.M., E.D.M.), Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287; Department of Epidemiology (D.Z., A.L.C.S., E.G., E.D.M.), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205; Division of Epidemiology and Community Health (P.L.L.), School of Public Health, University of Minnesota, Minneapolis, Minnesota 55455; and Department of Medicine (T.H.M.), University of Mississippi Medical Center, Jackson, Mississippi 39216.
Abstract
CONTEXT: A single measurement of 25-hydroxyvitamin D (25 [OH] D) may not accurately reflect long-term vitamin D status. Little is known about change in 25(OH)D levels over time, particularly among blacks. OBJECTIVE: The objective of the study was to determine the longitudinal changes in 25(OH)D levels among Atherosclerosis Risk in Communities (ARIC) study participants. DESIGN: This was a longitudinal study. SETTING: The study was conducted in the general community. PARTICIPANTS: A total of 9890 white and 3222 black participants at visit 2 (1990-1992), 888 whites and 876 blacks at visit 3 (1993-1994), and 472 blacks at the brain visit (2004-2006) participated in the study. MAIN OUTCOME MEASURE: The 25(OH)D levels were measured, and regression models were used to assess the associations between clinical factors and longitudinal changes in 25(OH)D. RESULTS: Vitamin D deficiency (<50 nmol/L [<20 ng/mL]) was seen in 23% and 25% of whites at visits 2 and 3, and in 61%, 70%, and 47% of blacks at visits 2, 3, and the brain visit, respectively. The 25(OH)D levels were correlated between visits 2 and 3 (3 y interval) among whites (r = 0.73) and blacks (r = 0.66). Among blacks, the correlation between visit 2 and the brain visit (14 y interval) was 0.33. Overall, increases in 25(OH)D levels over time was associated with male gender, use of vitamin D supplements, greater physical activity, and higher high-density lipoprotein-cholesterol (P < .001). Decreases in 25(OH)D levels over time were associated with current smoking, higher body mass index, higher education, diabetes, and hypertension (all P < .05). CONCLUSIONS: Among US blacks and whites, 25(OH)D levels remained relatively stable over time. Certain modifiable lifestyle factors were associated with change in 25(OH)D levels over time.
CONTEXT: A single measurement of 25-hydroxyvitamin D (25 [OH] D) may not accurately reflect long-term vitamin D status. Little is known about change in 25(OH)D levels over time, particularly among blacks. OBJECTIVE: The objective of the study was to determine the longitudinal changes in 25(OH)D levels among Atherosclerosis Risk in Communities (ARIC) study participants. DESIGN: This was a longitudinal study. SETTING: The study was conducted in the general community. PARTICIPANTS: A total of 9890 white and 3222 black participants at visit 2 (1990-1992), 888 whites and 876 blacks at visit 3 (1993-1994), and 472 blacks at the brain visit (2004-2006) participated in the study. MAIN OUTCOME MEASURE: The 25(OH)D levels were measured, and regression models were used to assess the associations between clinical factors and longitudinal changes in 25(OH)D. RESULTS:Vitamin D deficiency (<50 nmol/L [<20 ng/mL]) was seen in 23% and 25% of whites at visits 2 and 3, and in 61%, 70%, and 47% of blacks at visits 2, 3, and the brain visit, respectively. The 25(OH)D levels were correlated between visits 2 and 3 (3 y interval) among whites (r = 0.73) and blacks (r = 0.66). Among blacks, the correlation between visit 2 and the brain visit (14 y interval) was 0.33. Overall, increases in 25(OH)D levels over time was associated with male gender, use of vitamin D supplements, greater physical activity, and higher high-density lipoprotein-cholesterol (P < .001). Decreases in 25(OH)D levels over time were associated with current smoking, higher body mass index, higher education, diabetes, and hypertension (all P < .05). CONCLUSIONS: Among US blacks and whites, 25(OH)D levels remained relatively stable over time. Certain modifiable lifestyle factors were associated with change in 25(OH)D levels over time.
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