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Antenatal exposure to solar radiation and learning disabilities: Population cohort study of 422,512 children

Claire E Hastie1, Daniel F Mackay1, Tom L Clemens2

  • 1Institute of Health and Wellbeing, University of Glasgow, Glasgow, G12 8RZ, UK.

Scientific Reports
|June 29, 2019
PubMed

Insights

Maternal exposure to ultraviolet B (UVB) radiation during pregnancy may reduce the risk of learning disabilities in children. Higher UVB exposure was linked to a lower incidence of learning disabilities, suggesting a potential role in seasonal birth patterns.

Area of Science:

  • Environmental Health
  • Developmental Neuroscience
  • Public Health

Background:

  • Learning disability prevalence shows seasonal variation, potentially linked to factors like vitamin D deficiency due to low ultraviolet radiation exposure in high-latitude regions.
  • Vitamin D is crucial for normal brain development, and its deficiency is common during winter months.

Purpose of the Study:

  • To investigate the association between antenatal exposure to solar radiation (sunshine hours, ultraviolet A/B) and the risk of learning disabilities in children.
  • To explore the potential role of ultraviolet B (UVB) radiation in the seasonal patterning of learning disabilities.

Main Methods:

  • Linked Scottish School Pupil Censuses (2007-2016) with maternity records, sunshine hours, and satellite-derived ultraviolet A/B radiation data.
  • Employed logistic regression analyses to assess associations between solar radiation exposure and learning disabilities, adjusting for conception month and sex.
  • Analyzed data from 422,512 singleton schoolchildren born at term.

Main Results:

  • A significant inverse association was found between higher antenatal sunshine hours and UVB exposure and the risk of learning disabilities (highest quintile UVB: adjusted OR 0.55).
  • A dose-response relationship was observed for UVB exposure.
  • The association between UVB and learning disabilities was independent of ultraviolet A (UVA) exposure and significant across all three trimesters of pregnancy.

Conclusions:

  • Low maternal exposure to ultraviolet B radiation may contribute to the seasonal variation observed in learning disability rates.
  • Further research is warranted to confirm these findings and evaluate the efficacy of vitamin D supplementation strategies.

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