ArticlePublic health nutrition2017
Sun exposure, UV irradiance and serum 25-hydroxycholecalciferol in pregnant women in rural north India.
Article in Public health nutrition, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers, 1 of them a synthesis that pooled it.
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Who cites it
6 citing papers in PubMed, 1 synthesis or guideline pooled it, 12 citations in OpenAlex.
- 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
- Exploring the relationship between sunlight exposure, psychological health, and gestational weight gain: a prospective observational study.BMC public health · 2024Observational
- Sunlight, dietary habits, genetic polymorphisms and vitamin D deficiency in urban and rural infants of Bangladesh.Scientific reports · 2022Observational
- Vitamin D Status of School-Age Children in North India.Indian journal of pediatrics · 2022Article
- Vitamin D Postpartum Concentrations: Relationship with Nutritional Condition and Morbidities during Pregnancy.Journal of pregnancy · 2018Article
- Vitamin D research and public health nutrition: a current perspective.Public health nutrition · 2017Article
Corrections and comments
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Authors and funding
5 authors at 4 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveTo document the effect of season and environmental pollution on UVB irradiance; and to estimate cutaneous vitamin D synthesis in village women in different seasons.
designRadiant UVB energy was measured by a spectroradiometer in different seasons and, in April and May, on successive days in open areas at the city outskirts, at a crowded inner-city area and the villages of our participants. Clothing, outdoor activity pattern and serum 25-hydroxycholecalciferol (25(OH)D) levels were documented.
settingRural north India, latitude 26·8°N. SUBJECTS: Pregnant women (n 139, aged 20-40 years).
resultsUVB irradiance ranged from 56 µW/cm2 in January to 470 µW/cm2 in June. Proportion of skin exposed was 18·5 % in summer and 9·5 % in winter. Mean (sd) daily duration of sun exposure was 3·2 (0·2) h during winter and 2·1 (0·4) h during summer. Cutaneous vitamin D synthesis was estimated to be 19·25 µg (770 IU) during winter and 37·25 µg (1490 IU) during summer. Mean (sd) serum 25(OH)D was 28 (15) nmol/l during winter (92 % of participants with 50 nmol/l). Mean (sd) UVB irradiance at peak summer was significantly higher at the open areas and in the villages than at the inner-city location (340 (45) and 310 (60) v. 250 (50) µW/cm2, P=0·03).
conclusionsIn our population, at latitude 26·8°N, poor skin exposure is a limiting factor in all seasons. During winter, low UVB radiation energy also contributes. Particulate pollution limits UVB irradiance. Vitamin D supplementation during winter may be necessary.
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