Vitamin D deficiency, cognitive impairment and dementia: a systematic review and meta-analysis - PubMed (original) (raw)
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doi: 10.1159/000339702. Epub 2012 Jul 2.
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- PMID: 22759681
- DOI: 10.1159/000339702
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Vitamin D deficiency, cognitive impairment and dementia: a systematic review and meta-analysis
Thorleif Etgen et al. Dement Geriatr Cogn Disord. 2012.
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Abstract
Background: Recent preventive strategies for patients with cognitive impairment include the identification of modifiable somatic risk factors like vitamin D deficiency.
Methods: A systematic literature research and meta-analysis were conducted to assess the association of cognitive impairment and vitamin D deficiency.
Results: Data from cross-sectional and longitudinal studies suggest an association between cognitive impairment and vitamin D deficiency. Meta-analysis of 5 cross-sectional and 2 longitudinal studies comprising 7,688 participants showed an increased risk of cognitive impairment in those with low vitamin D compared with normal vitamin D (OR 2.39, 95% CI 1.91-3.00; p < 0.0001).
Conclusions: Methodological limitations of these studies comprise heterogeneity of study populations, different forms of cognitive assessment, the problem of reverse causality, different definitions of vitamin D deficiency and inconsistent control for confounders. As the value of vitamin D substitution in cognitive impairment remains doubtful, a long-time major placebo-controlled randomized trial of vitamin D supplementation in participants with mild cognitive impairment (MCI) should be started.
Copyright © 2012 S. Karger AG, Basel.
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