Observational studyBMJ open2017
Vitamin D status and associated factors among Portuguese older adults: results from the Nutrition UP 65 cross-sectional study.
Observational study in BMJ open, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed.
- Impact of body composition on vitamin D requirements in healthy adults with vitamin D deficiency.Frontiers in endocrinology · 2025Trial
- Article
- Social determinants of serum 25-hydroxyvitamin D concentrations deficiency in older Chilean people.Scientific reports · 2023Article
- Article
- Distribution of vitamin D status in the UK: a cross-sectional analysis of UK Biobank.BMJ open · 2021Article
- Darker Skin Color Measured by Von Luschan Chromatic Scale and Increased Sunlight Exposure Time Are Independently Associated with Decreased Odds of Vitamin D Deficiency in Thai Ambulatory Patients.Journal of nutrition and metabolism · 2021Article
- Vitamin D Status and Its Correlation With Anthropometric and Biochemical Indicators of Cardiometabolic Risk in Serbian Underground Coal Miners in 2016.Frontiers in nutrition · 2021Article
- Nutrihealth Study: Seasonal Variation in Vitamin D Status Among the Slovenian Adult and Elderly Population.Nutrients · 2020Article
- Associations of Serum 25-Hydroxyvitamin D with Adiposity and At-Risk Lipid Profile Differ for Indigenous (Orang Asli) Male and Female Adults of Peninsular Malaysia.International journal of environmental research and public health · 2020Article
- 25-OH Vitamin D Levels and Cognitive Performance: Longitudinal Assessment in a Healthy Aging Cohort.Frontiers in aging neuroscience · 2019Article
- Vitamin D status and functional parameters: A cross-sectional study in an older population.PloS one · 2018Article
- The association between 25(OH)D levels, frailty status and obesity indices in older adults.PloS one · 2018Observational
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Authors and funding
9 authors.
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Abstract
objectivesTo evaluate vitamin D status and its associated factors in Portuguese older adults from the Nutrition UP 65 study.
designCross-sectional observational study. PARTICIPANTS AND
methodsNationwide cluster sample of 1500 Portuguese subjects ≥65 years old. Participants were classified, according to US Institute of Medicine cut-offs, as presenting normal 25-hydroxyvitamin D (25(OH)D) levels (≥50.0 nmol/L), at risk of inadequacy (30.0-49.9 nmol/L) or at risk of deficiency (<30 nmol/L). The association between individuals' characteristics and 25(OH)D levels was analysed through multinomial logistic regression analysis.
resultsMedian 25(OH)D serum value was 36.1 (interquartile range (IQR): 35.5) nmol/L. According to the used cut-offs, 39.6% of participants were at risk of 25(OH)D deficiency and 29.4% were at risk of 25(OH)D inadequacy. In the adjusted model, having higher skin pigmentation and waist circumference >88 cm for women and >102 cm for men were associated with higher odds of 25(OH)D deficiency. Otherwise, living in Lisbon Metropolitan Area and in Madeira, 1-12 years of schooling, being married or in a common-law marriage, monthly income ≥€1000, alcohol consumption, medication or supplements with vitamin D supplement use, and blood samples collected in spring or summer were associated with lower odds of being at risk of 25(OH)D deficiency. In this model, season of blood sample collection, medication or supplements use, and waist circumference were the factors more strongly associated with 25(OH)D levels.
conclusionsDespite using the conservative Institute of Medicine cut-offs, over two-thirds of these study participants presented inadequate 25(OH)D levels, warranting the implementation of corrective measures. Potentially modifiable factors were strongly associated with 25(OH)D levels in this study. These findings may be particularly relevant to the development of public health policies in southern European countries.
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