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Abstract: Objective: To provide a systematic review and meta-analysis of prospective, population-based cohort studies on the association of serum 25-hydroxyvitamin D (25(OH)D) and all-cause mortality. Methods: Relevant studies were identified by systematically searching Medline, EMBASE and ISI Web of Knowledge. Reported hazard ratios (HRs) for 25(OH)D categories were recalculated employing comprehensive trend estimation from summarized dose-response data and pooled in a random effects model meta-analysis. Results: Overall, 12 original studies were included in the review and meta-analysis comprising 32,142 mainly elderly study participants with measured 25(OH)D of whom 6921 died during follow-up. An inverse association between 25(OH)D levels and all-cause mortality was found in all but two studies that was statistically significant in several of the individual studies. In meta-analysis, 25(OH)D levels were significantly inversely associated with all-cause mortality with a pooled HR of 0.92 (95% confidence interval: 0.89–0.95) for a 20nmol/l increase in 25(OH)D levels. Conclusion: In this meta-analysis of prospective, population-based cohort studies, a 20nmol/l increase in 25(OH)D levels was associated with an 8% lower mortality in the general elderly population. This agrees with results from meta-analyses on randomized controlled trials that found a decrease in mortality with vitamin D3 supplementation of a comparable magnitude. [Copyright &y& Elsevier]

Background & Aims: Associations of serum gamma-glutamyltransferase levels with a variety of incident diseases and mortality have been suggested. The present study attempted to expand the body of evidence to especially relevant occupational cohorts in which exposure to established γ-GT determinants may greatly differ from the general population. Methods: The study was based on occupational health examinations conducted from 1986 to 1992 in 19,090 German male workers from the construction industry, aged 25–64years. Sociodemographics and other health-related information were collected during the exam. Vital status follow-up was conducted through 2008. Associations of baseline γ-GT levels (measurements at 25°C) with all-cause and cause-specific mortality were examined by Kaplan–Meier plotting and multiple adjusted Cox regression models. Results: A total of 2170 deaths occurred during 303,198 person-years of follow-up. The risk of death due to any cause was 2.5-fold increased in subjects in the highest (⩾39U/L) versus lowest (<11U/L) γ-GT quintile. To varying extents, elevated γ-GT was associated with higher mortality due to cancer, circulatory, respiratory, and digestive causes, as well as accidents/poisoning. Conclusions: The findings in this cohort provide evidence for γ-GT being associated with a broad range of causes of death, including less investigated outcomes. Some characteristics of the observed patterns need to be seen in the context of our cohort, featuring particularly high γ-GT levels. [ABSTRACT FROM AUTHOR]