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Ginde, Adit A.; Scragg, Robert; Schwartz, Robert S.; Camargo Jr, Carlos A.
Journal of the American Geriatrics Society, September 2009, Letnik: 57, Številka: 9Journal Article
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 25OHD). 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 25OHD levels<25.0 nmol/L vs those ≥100.0 nmol/L) than for non‐CVD mortality (adjusted HR=1.42, 95% CI=0.73–2.79, for subjects with 25OHD levels<25.0 nmol/L vs those ≥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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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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