BACKGROUND: It has been postulated that ultraviolet ray exposure in childhood might influence the development of allergic disease. We examined whether reported sun exposure during childhood or in adolescence is related to the occurrence of atopy or allergic disease. METHODS: Population-based longitudinal cohort study with sixteen-year follow-up (N = 415). Subjects were recruited at birth as part of an infant health study. The reported daily duration of sun exposure in the summer months was recorded at 8 and 16 yrs of age. Allergen sensitization and the presence of eczema, asthma, and rye grass positive rhinitis were recorded at age 16. RESULTS: Reported sun exposures of more than 4 h per day during summer holidays in adolescence were associated with reduced eczema and rhinitis but not inhalant allergen sensitization or asthma risk. Thus, higher sun exposure during summer holidays and summer weekends in adolescence was associated with significantly reduced eczema (test of trend p-value = 0.001 summer holidays; test of trend p-value = 0.003 summer weekends) and rye grass positive rhinitis (test of trend p-value = 0.03 summer holidays; test of trend p-value = 0.02 summer weekends). Sun exposure at adolescence or age 8 was not related to inhalant allergen sensitization. There was no association between serum 25(OH)D levels at adolescence with either inhalant allergen sensitization or allergic disease and adjustment for serum 25(OH)D levels did not alter these findings. CONCLUSIONS: Increased sun exposure during summer holidays in adolescence was associated with reduced eczema and rhinitis risk, independently of measured vitamin D levels but no difference in inhalant allergen sensitization or asthma. The beneficial effects of sun exposure on allergic disease may operate independently from vitamin D or an effect on allergen sensitization.

Item Type:	Refereed Article
Keywords:	atopy, eczema, sun exposure, vitamin D
Research Division:	Biomedical and Clinical Sciences
Research Group:	Immunology
Research Field:	Allergy
Objective Division:	Health
Objective Group:	Clinical health
Objective Field:	Clinical health not elsewhere classified
UTAS Author:	Ponsonby, AL (Professor Anne Ponsonby)
UTAS Author:	Cochrane, JA (Mrs Jennifer Cochrane)
UTAS Author:	Dwyer, T (Professor Terry Dwyer)
UTAS Author:	Jones, G (Professor Graeme Jones)
ID Code:	85906
Year Published:	2013
Web of Science® Times Cited:	13
Deposited By:	Menzies Institute for Medical Research
Deposited On:	2013-08-14
Last Modified:	2017-11-07
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