ArticleRevista paulista de pediatria : orgao oficial da Sociedade de Pediatria de Sao Paulo2023
Association of sun exposure and seasonality with vitamin D levels in Brazilian children and adolescents.
Article in Revista paulista de pediatria : orgao oficial da Sociedade de Pediatria de Sao Paulo, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
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Who cites it
5 citing papers in PubMed, 6 citations in OpenAlex.
- Sleep Duration and Sun Exposure in Portuguese Children: Associations With Obesity Indicators.American journal of human biology : the official journal of the Human Biology Council · 2026Article
- Vitamin D status and its determinants among Chinese infants and toddlers in Hong Kong.European journal of nutrition · 2025Article
- Vitamin D and calcium-phosphorus in serum of children with celiac disease in a zone of high sunlight exposure.Frontiers in pediatrics · 2025Article
- Knowledge about Vitamin D among General Population in Baghdad City.Rwanda journal of medicine and health sciences · 2024Article
- Article
Corrections and comments
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Authors and funding
6 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveThis study aimed to verify vitamin D concentration in children and adolescents during the seasons of the year and to compare vitamin D concentration between children engaged in outdoor activities and those engaged in indoor activities.
methodsThis is a cross-sectional study with a sample of 708 children and adolescents (aged 6-18 years), excluding 109 (16 were over 19 years old; 39 had a disease that required continuous treatment; 20 were on continuous medication; and 34 had no vitamin D data), ending with 599. The plasma concentration of 25-hydroxyvitamin D2 was measured with commercial kits following manufacturer instructions.
resultsParticipants who engaged in outdoor activities, as well as those who had data collected during summer and spring, had higher levels of vitamin D. According to the Poisson regression, the proportion of participants with inadequate levels of vitamin D was greater in the participants whose vitamin D was measured during spring (PR 1.15, 95%CI 1.03-1.29) and winter (PR 1.18, 95%CI 1.05-1.32). Also, a greater proportion of inadequate vitamin D was observed for those engaged in indoor activities (PR 1.08, 95%CI 1.01-1.15).
conclusionsParticipants who measured the vitamin during the summer and autumn had a lower prevalence of hypovitaminosis D. Even in regions with high solar incidence throughout the year, vitamin D levels can vary significantly during the period's seasons.
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Registered trials
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