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Abstract Title:

Prospective study of serum 25-hydroxyvitamin D level, cardiovascular disease mortality, and all-cause mortality in older U.S. adults.

Abstract Source:

J Am Geriatr Soc. 2009 Sep;57(9):1595-603. Epub 2009 Jun 22. PMID: 19549021

Abstract Author(s):

Adit A Ginde, Robert Scragg, Robert S Schwartz, Carlos A Camargo

Article Affiliation:

Department of Emergency Medicine, School of Medicine, University of Colorado Denver, 12401 E. 17th Avenue, B-215, Aurora, CO 80045. adit.ginde@ucdenver.edu

Abstract:

OBJECTIVES: To evaluate the association between serum 25-hydroxyvitamin D (25(OH)D) levels and mortality in a representative U.S. sample of older adults.

DESIGN: Prospective cohort from the Third National Health and Nutrition Examination Survey (NHANES III) and linked mortality files.

SETTING: Noninstitutionalized U.S. civilian population.

PARTICIPANTS: Three thousand four hundred eight NHANES III participants aged 65 and older enrolled from 1988 to 1994 and followed for mortality through 2000.

MEASUREMENTS: Primary exposure was serum 25(OH)D level at enrollment. Primary and secondary outcomes were all-cause and cardiovascular disease (CVD) mortality, respectively.

RESULTS: During the median 7.3 years of follow-up, there were 1,493 (44%) deaths, including 767 CVD-related deaths. Median 25(OH)D level was 66 nmol/L. Adjusting for demographics, season, and cardiovascular risk factors, baseline 25(OH)D levels were inversely associated with all-cause mortality risk (adjusted hazard ratio (HR)=0.95, 95% confidence interval (CI)=0.92-0.98, per 10 nmol/L 25[OH]D). Compared with subjects with 25(OH)D levels of 100 nmol/L or higher, the adjusted HR for subjects with levels less than 25.0 nmol/L was 1.83 (95% CI=1.14-2.94) and for levels of 25.0 to 49.9 nmol/L was 1.47 (95% CI=1.09-1.97). The association appeared stronger for CVD mortality (adjusted HR=2.36, 95% CI=1.17-4.75, for subjects with 25[OH]D levels<25.0 nmol/L vs those>or =100.0 nmol/L) than for non-CVD mortality (adjusted HR=1.42, 95% CI=0.73-2.79, for subjects with 25[OH]D levels<25.0 nmol/L vs those>or =100.0 nmol/L).

CONCLUSION: In noninstitutionalized older adults, a group at high risk for all-cause mortality, serum 25(OH)D levels had an independent, inverse association with CVD and all-cause mortality. Randomized controlled trials of vitamin D supplementation in older adults are warranted to determine whether this association is causal and reversible.

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