Observational studyBMC geriatrics2017
Association between serum 25-hidroxyvitamin D concentrations and ultraviolet index in Portuguese older adults: a cross-sectional study.
Observational study in BMC geriatrics, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 15 citations in OpenAlex.
- Assessing the impact of a mushroom-derived food ingredient on vitamin D levels in healthy volunteers.Journal of the International Society of Sports Nutrition · 2020Trial
- Long Noncoding RNA NORAD Promotes Fracture Healing through Interacting with Osteoblast Differentiation via Targeting miR-26a.BioMed research international · 2023Article
- Vitamin D status of the Russian adult population from 2013 to 2018.Scientific reports · 2022Article
- 25-Hydroxyvitamin D reference percentiles and the role of their determinants among European children and adolescents.European journal of clinical nutrition · 2022Article
- Development of a predictive model for vitamin D deficiency based on the vitamin D status in young Japanese women: A study protocol.PloS one · 2022Article
- Effects of Alpha-hydroxy-isocaproic acid upon Body Composition in a Type I Diabetic Patient with Muscle Atrophy - A Case Study.The Yale journal of biology and medicine · 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 at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe older population is a risk group for hypovitaminosis D. The Ultraviolet Index (UVI) can be an indicator of potential for cutaneous synthesis of vitamin D but physiological and other environmental factors also influence vitamin D synthesis and status. Knowledge about vitamin D status in Portuguese older adults is limited. This study aims to explore the association between Ultraviolet Index and serum 25-hidroxyvitamin D3 [25(OH)D] levels accounting for other potential influential factors.
methodsA cross-sectional study was conducted between December 2015 and June 2016, in 1497 Portuguese older adults (≥ 65 years) within Nutrition UP 65 project. For each participant, serum 25(OH)D was determined and the mean UVI (mUVI) in the respective residence district was calculated for the previous 30 days. Stepwise linear regression analyses were conducted for the following periods of blood collection: between December and June, December and March and April and June. Standardized regression coefficients (Sβ) and 95% confidence intervals were calculated.
resultsThe median 25(OH)D concentration was 35.9 nmol/L. The UVI was independently and positively associated with 25(OH)D in the models for December-June (Sβ = 0.244, 95% CI: 0.198; 0.291, P < 0.001) and April-June (Sβ = 0.295, 95% CI: 0.299; 0.362, P < 0.001) and independently and negatively associated in December-March period (Sβ = -0.149, 95% CI: -0.211; -0.087, P < 0.001).
conclusionsIn this sample with high vitamin D deficiency frequency, the UVI was a predictor of 25(OH)D levels but the direction of the association varied according to the blood collection period. Our results suggest that accounting for the time of year in future research regarding vitamin status and related public health recommendations may be relevant.
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