An Australian national panel study of diurnal temperature range and children's respiratory health

Shanshan Li, Peter J. Baker, Bin Jalaludin, Yuming Guo, Guy B Marks, Lyn S. Denison, Gail M Williams

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

Background It is still uncertain whether diurnal temperature range (DTR) affects children's respiratory function. Objective To examine the effects of DTR on lung function and respiratory symptoms for school children with asthma in Australia. Methods A panel of 270 children (ages 7-12 years) with asthma living in 6 Australian cities was recruited. They were asked to perform 3 successive forced expiratory maneuvers using a portable electronic peak flow meter twice daily for 4 weeks. The highest values for peak expiratory flow (PEF) were stored for each session. At the same time, they were asked to record their respiratory symptoms (eg, cough and/or phlegm and wheeze and/or chest tightness) every day in the morning (for nighttime symptoms) and evening (for daytime symptoms). Daily data on different metrics of ambient temperature and air pollution were obtained from fixed monitors nearby. Relative humidity data were downloaded from the Weather Underground website. Mixed models, adjusting for children's individual characteristics and air pollution, were used to examine the effects of DTR on PEF and respiratory symptoms. Results DTR had linear effects on PEF and respiratory symptoms. An increase in DTR induced a reduction in PEF and increased the occurrence of respiratory symptoms. In general, the effects lasted for 3 days (lag, 0-2 days). The effects occurred for both boys and girls. Conclusion Our findings provide evidence that DTR had significant effects on lung function and respiratory symptoms for children with asthma. These results indicate that it is important and necessary to protect children with asthma from the effect of unstable weather.

Original languageEnglish
Pages (from-to)348-353.e8
Number of pages14
JournalAnnals of Allergy, Asthma and Immunology
Volume112
Issue number4
DOIs
Publication statusPublished - 2014
Externally publishedYes

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