Abstract
Summary
Vitamin D deficiency is prevalent worldwide, but its prevalence is unknown in adult Portuguese population. In Portugal, 66% of adults present Vitamin D insufficiency/deficiency. Winter, living in Azores, older age, and obesity were the most important risk factors. It highlights the need of strategies to prevent vitamin D deficiency in Portugal.
Objective
To estimate the prevalence and risk factors of vitamin D deficiency in the adult Portuguese population.
Methods
Adults (≥ 18 years old) from the EpiReumaPt Study (2011–2013) were included. Standardized questionnaires on socio-demographic and lifestyle features were obtained. Serum 25-hydroxyvitamin D [25(OH)D] concentrations were evaluated using ADVIA Centaur VitD competitive immunoassay (Siemens Healthineers) in 2015–2017 as 25 (OH)D Level 0: ≤ 10 ng/mL; Level 1: 11–19 ng/mL; Level 2: 20–29 ng/mL, and Level 3: ≥ 30 ng/mL. Weighted multinomial regression analysis was conducted to evaluate the association between socio-demographic and lifestyle variables and vitamin D status.
Results
Based on weighted analysis, the estimated prevalence of levels of 25(OH)D ≤ 10, < 20, and < 30 ng/mL was 21.2, 66.6, and 96.4%, respectively. The strongest independent predictors of serum 25 (OH)D ≤ 10 ng/mL were living in the Azores archipelagos (OR 9.39; 95%CI 1.27–69.6) and having the blood sample collection in winter (OR 18.53; 95%CI 7.83–43.87) or spring (11.55; 95%CI 5.18–25.74). Other significant predictors included older age (OR 5.65, 95%CI 2.08–15.35), obesity (OR 2.61; 95%CI 1.35–5.08), current smoking (OR 2.33; 95%CI 1.23–4.43), and female gender (OR 1.9, 95%CI 1.1–3.28). Conversely, physical exercise (OR 0.48, 95%CI 0.28–0.81) and occasional alcohol intake (OR 0.48, 95%CI 0.29–0.81) were associated with a lower risk of 25(OH)D ≤ 10 ng/mL.
Conclusion
Vitamin D deficiency/insufficiency [25(OH)D < 20 ng/ml] is highly prevalent in Portugal, affecting > 60% of all Portuguese adults, with strong geographical and seasonal variation. This study highlights the need to critically assess the relevance of vitamin D deficiency as a public health problem and the urgent need for a wide and scientifically robust debate about the most appropriate interventions at the individual and societal levels.
Change history
02 April 2020
The original version of this article, published on 02 March 2020, unfortunately contained an error on “Fig. 3 Prevalence of Vitamin D Levels by NUTSII.”
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Acknowledgments
We acknowledge the support from the EpiReuma Study Group and the invaluable input from Loreto Carmona, Phd, on the initial development of the study protocol.
Funding
This study received financial support from Portuguese Society of Rheumatology, Siemens Portugal, Jaba-Recordati and Tecnimed. There was no influence whatsoever of the sponsors on the design and performance of the study or analysis and report of its results.
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CD wrote the article. All the authors were involved in revising the manuscript critically and approved the final version to be submitted for publication. CD had full access to all of the data in the study and takes responsibility for its integrity and for the accuracy of the data analysis.
Study conception and design: CD, AM, JAPS.
Acquisition of data: AR, HC, JB, CD, HC.
Analysis and interpretation of data: CD, AR, SD, JAPS.
Final report writing: CD and JAPS.
Report revision and approval: all authors.
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Competing interests
Da Silva has received honoraria as speaker on Vitamina D from Tecnimed, Jaba-Recordati, Azevedos, Merck S.A, Laboratórios Vitoria and Siemens. da Silva has received as Scientific Director of Forum D (http://forumd.org/forumd/), which receive unrestricted financial support of pharmaceutical companies. Duarte has received Scientific Redactor of Forum D (http://forumd.org/forumd/) which received unrestricted financial support of pharmaceutical companies.
Ethics approval and consent to participate
This study was conducted respecting the Declaration of Helsinki and was approved by Coimbra Medical School Ethics Committee and EpiReumaPt Scientific Board.
EpiReumaPt was performed according to the principles established by the Declaration of Helsinki, revised in Fortaleza [32]. EpiReumaPt was approved by the National Committee for Data Protection (Comissão Nacional de Proteção de Dados) and by the NOVA Medical School Ethics Committee. Written informed consent was obtained in all phases for all participants, including a separated informed consent for biobank. Further details of ethical issues of EpiReumaPt have been described elsewhere [27].
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Duarte, C., Carvalheiro, H., Rodrigues, A.M. et al. Prevalence of vitamin D deficiency and its predictors in the Portuguese population: a nationwide population-based study. Arch Osteoporos 15, 36 (2020). https://doi.org/10.1007/s11657-020-0695-x
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DOI: https://doi.org/10.1007/s11657-020-0695-x