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Open Access Research

Diurnal temperature range and childhood asthma: a time-series study

Zhiwei Xu1, Cunrui Huang2, Hong Su3, Lyle R Turner1, Zhen Qiao1 and Shilu Tong1*

Author Affiliations

1 School of Public Health and Social Work& Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Brisbane, Australia

2 Centre for Environment and Population Health, School of Environment, Griffith University, Brisbane, Australia

3 Department of Health Statistics and Epidemiology, School of Public Health, Anhui Medical University, Hefei, China

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Environmental Health 2013, 12:12  doi:10.1186/1476-069X-12-12

Published: 1 February 2013

Abstract

Background

Hot and cold temperatures have been associated with childhood asthma. However, the relationship between daily temperature variation and childhood asthma is not well understood. This study aimed to examine the relationship between diurnal temperature range (DTR) and childhood asthma.

Methods

A Poisson generalized linear model combined with a distributed lag non-linear model was used to examine the relationship between DTR and emergency department admissions for childhood asthma in Brisbane, from January 1st 2003 to December 31st 2009.

Results

There was a statistically significant relationship between DTR and childhood asthma. The DTR effect on childhood asthma increased above a DTR of 10°C. The effect of DTR on childhood asthma was the greatest for lag 0–9 days, with a 31% (95% confidence interval: 11% – 58%) increase of emergency department admissions per 5°C increment of DTR. Male children and children aged 5–9 years appeared to be more vulnerable to the DTR effect than others.

Conclusions

Large DTR may trigger childhood asthma. Future measures to control and prevent childhood asthma should include taking temperature variability into account. More protective measures should be taken after a day of DTR above10°C.

Keywords:
Climate change; Diurnal temperature range; Childhood asthma