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Low vitamin D status in relation to cardiovascular disease and mortality in Swedish women - Effect of extended follow-up

Journal article
Authors Monica Leu Agelii
Susanna Lehtinen-Jacks
Henrik Zetterberg
Valter Sundh
Cecilia Björkelund
Lauren Lissner
Published in Nutrition Metabolism and Cardiovascular Diseases
Volume 27
Issue 12
Pages 1143-1151
ISSN 0939-4753
Publication year 2017
Published at Institute of Medicine, Department of Public Health and Community Medicine
Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Institute of Medicine, Department of Public Health and Community Medicine, Public Health Epidemiology Unit
Pages 1143-1151
Language en
Links doi.org/10.1016/j.numecd.2017.10.01...
Keywords Vitamin D, 25(OH) D, Cardiovascular disease, Stroke, All-cause mortality, Biobank, Extended follow-up, serum 25-hydroxyvitamin d, all-cause mortality, respiratory-disease, prospective cohort, d deficiency, risk-factor, metaanalysis, associations, cancers, men, Cardiovascular System & Cardiology, Endocrinology & Metabolism, Nutrition & Dietetics
Subject categories Cardiovascular medicine, Endocrinology and Diabetes, Nutrition and Dietetics

Abstract

Background and aims: The impact of vitamin D concentrations on subsequent cardiovascular disease (CVD) and overall mortality has been generally examined for periods under two decades. The magnitude of the association may depend on follow-up length. We aimed to investigate the relationship between baseline vitamin D and risk of total CVD, stroke and all-cause mortality over three decades of follow-up. Secondly, we aimed to assess how follow-up affects the associations. Methods and results: Concentrations of 25-hydroxyvitamin D (25D) were measured in a population-based sample of 1227 middle-aged women using serum collected at baseline and categorized into low (lowest 25D quartile) vs high 25D status (upper three 25D quartiles). Hazard ratio (HR) of the endpoints was estimated for low 25D. The impact of follow-up was examined in intermediary analyses where follow-up was interrupted up to four times, each time decreasing it by five years. There were 596 cardiovascular events and 635 participants died. During the first 17 years, the low 25D group experienced a 29% higher CVD risk and 3.3-fold higher stroke risk after accounting for confounders. Longer follow-up diminished significantly these risks and 25D status had no contribution at 32 years. For mortality, the decline over time was less dramatic, with HR = 1.96 (1.25; 3.08) at 17 years and HR = 1.42 (1.17; 1.72) at 37 years. Conclusion: Low 25D status increased the risk for all endpoints, but a lengthy follow-up diminished these risks towards the null. The impact of follow-up depends on the outcome. Future studies of 25D and disease should use repeated 25D assessments. (C) 2017 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine and Surgery, Federico II University. Published by Elsevier B. V. All rights reserved.

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