Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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The relationships among birth season, sunlight exposure during infancy, and allergic disease

  • Hwang, Jung Min (Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine) ;
  • Oh, Se Hyun (Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine) ;
  • Shin, Mee Yong (Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine)
  • Received : 2015.09.10
  • Accepted : 2015.11.09
  • Published : 2016.05.15
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Abstract

Purpose: The recent increase in the prevalence of allergic diseases is hypothetically attributed to immune dysregulation in turn caused by a reduction in exposure to sunlight. We explored relationships between birth season, sunlight exposure, exercise duration, and an allergic disease. Methods: We performed a questionnaire-based survey on allergic diseases among elementary school students. Birth time was categorized according to the season (summer and winter). Results: The prevalence of atopic dermatitis (AD) "symptoms ever" was higher in the children born in winter than in those born in summer (adjusted odds ratio [aOR], 1.24; 95% confidence interval [CI], 1.03-1.49; P=0.024). Birth in winter was associated with an increase in the "symptoms in the past 12 months" prevalence of food allergy (FA) (aOR, 1.56; 95% CI, 1.09-2.24; P=0.015). The lifetime prevalence of allergic diseases except FA was higher in the children whose parents considered their sunlight exposure prior to 24 months of ageas inadequate than those who considered their exposure as adequate ("diagnosis ever" asthma: aOR, 1.4; 95% CI, 1.17-1.67; P<0.001; allergic rhinitis [AR]: aOR, 1.4; 95% CI, 1.17-1.67; P<0.001; AD: aOR, 1.26; 95% CI, 1.06-1.51; P=0.01). Neither recent sunlight exposure nor exercise duration was associated with the prevalence of an allergic disease. Conclusion: Birth in winter may be associated with development of AD and FA. Inadequate sunlight exposure before the age of 24 months might possibly increase the risks of development of asthma, AR, and AD.

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References

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