ArticleDermato-endocrinology2013
Vitamin D status and sun exposure in India.
Article in Dermato-endocrinology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04986319 (The Level of Serum Vitamin D And Parathyroid Hormone Among Different Bangladeshi Population Groups), which is not on this map. Cited by 56 papers, 4 of them syntheses that pooled it.
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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
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
The Level of Serum Vitamin D And Parathyroid Hormone Among Different Bangladeshi Population Groups
Who cites it
56 citing papers in PubMed, 4 syntheses or guidelines pooled it, 140 citations in OpenAlex.
- Association of vitamin D receptor genetic variants with therapeutic response in multidrug-resistant pulmonary tuberculosis: a systematic review.Frontiers in cellular and infection microbiology · 2026Pooled it
- Vitamin D deficiency in rheumatoid arthritis patients of India - a single-arm meta-analysis.African health sciences · 2023Pooled it
- Vitamin D Food Fortification and Nutritional Status in Children: A Systematic Review of Randomized Controlled Trials.Nutrients · 2019Pooled it
- Low vitamin D levels are associated with high viral loads in patients with chronic hepatitis B: a systematic review and meta-analysis.BMC gastroenterology · 2019Pooled it
- Prevalence and determinants of vitamin D deficiency among children aged 9 months to 12 years at a tertiary care center in western India: a cross-sectional study.BMC pediatrics · 2025Article
- Associations of bone health biomarkers and bone mineral density with dietary intakes in vitamin D deficient women: a cross-sectional study.Scientific reports · 2025Article
- Article
- Therapeutic Sunbathing in Yoga and Naturopathy Hospitals: Establishing National Standards through the Delphi Methodology.Journal of lifestyle medicine · 2025Article
- The prevalence of vitamin D deficiency and its association to modifiable risk factors of cardiovascular disease among apparently healthy adults in Central Kerala.Journal of family medicine and primary care · 2025Article
- From cultural dispositions to biological dimensions: a narrative review on the synergy between oral health and vitamin D through the lens of Indian habitus.Frontiers in oral health · 2025Review
- Prevalence of low vitamin D status in an urban district in Sri Lanka: a population-based study.BMC nutrition · 2024Article
- Serum 25(OH) vitamin D deficiency among young adults in the East Khasi Hills district of Meghalaya and its influence on bone mineral density: Investigating the involvement of the RANKL/RANK/OPG system.Journal of family medicine and primary care · 2024Article
- Low levels of Vitamin D during pregnancy associated with gestational diabetes mellitus and low birth weight: results from the MAASTHI birth cohort.Frontiers in nutrition · 2024Article
- Contribution of Vitamin D Metabolites to Vitamin D Concentrations of Families Residing in Pune City.Nutrients · 2023Article
- Prevalence and Risk Factors for Vitamin D Deficiency in Children and Adolescents in the Kingdom of Bahrain.Nutrients · 2023Article
- Gender-related differences in the association of serum levels of vitamin D with body mass index in northern Iranian population: the PERSIAN Guilan Cohort Study (PGCS).BMC nutrition · 2022Article
- Vitamin D status and determinants in Indian children and adolescents: a multicentre study.Scientific reports · 2022Article
- Attitudes of mothers attending public hospitals in Addis Ababa, Ethiopia, to neonatal sunlight exposure: a cross-sectional study.BMJ paediatrics open · 2022Article
- Factors associated with vitamin D deficiency among patients with musculoskeletal disorders seeking physiotherapy intervention: a hospital-based observational study.BMC musculoskeletal disorders · 2022Observational
- Vitamin D status among Kashmiri tribal population: A cross-sectional community-based study.The Indian journal of medical research · 2022Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 4 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundLittle if any cutaneous production of vitamin D3 occurs at latitudes above and below 35° N and 35° S during the winter months. It was postulated that those residing in tropics synthesize enough vitamin D3 year round. Several studies have documented the effect of latitude, season and time of the day on the cutaneous production of vitamin D3 in an ampoule model. Studies from India have shown high prevalence of vitamin D deficiency despite abundant sunshine.
methodsWe studied the influence of season and time of the day on synthesis of previtamin D3 in an ampoule model in Tirupati, (latitude 13.40° N and longitude 77.2° E) south India, between May 2007 to August 2008. Sealed borosilicate glass ampoules containing 50 μg of 7-DHC in 1 ml of methanol were exposed to sunlight hourly from 8 a.m. until 4 p.m. The percent conversion of 7-DHC to previtamin D3 and its photoproducts and the percent of previtamin D3 and vitamin D3 formed was estimated and related to solar zenith angle.
resultsThe percent conversion of 7-DHC to previtamin D3 and its photoproducts and formation of previtamin D3 and vitamin D3 was maximal between 11 a.m. to 2 p.m. of the day during the entire year (median 11.5% and 10.2% respectively at 12.30 p.m.).
conclusionsTherefore at this latitude exposure to sunlight between the hours of 11 a.m. and 2 p.m. will promote vitamin D production in the skin year round.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.