Maternal exposure to heatwave and preterm birth in Brisbane, Australia

Wang, J., Williams, G., Guo, Y., Pan, X. and Tong, S. (2013) Maternal exposure to heatwave and preterm birth in Brisbane, Australia. BJOG: An International Journal of Obstetrics & Gynaecology, 120 13: 1631-1641. doi:10.1111/1471-0528.12397

Author Wang, J.
Williams, G.
Guo, Y.
Pan, X.
Tong, S.
Title Maternal exposure to heatwave and preterm birth in Brisbane, Australia
Journal name BJOG: An International Journal of Obstetrics & Gynaecology   Check publisher's open access policy
ISSN 1470-0328
Publication date 2013-08-20
Sub-type Article (original research)
DOI 10.1111/1471-0528.12397
Open Access Status DOI
Volume 120
Issue 13
Start page 1631
End page 1641
Total pages 11
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
Objective To quantify the short-term effects of maternal exposure to heatwave on preterm birth.
Design An ecological study.
Setting A population-based study in Brisbane, Australia.
Population All pregnant women who had a spontaneous singleton live birth in Brisbane between November and March in 2000–2010 were studied.

Methods Daily data on pregnancy outcomes, meteorological factors, and ambient air pollutants were obtained. The Cox proportional hazards regression model with time-dependent variables was used to examine the short-term impact of heatwave on preterm birth. A series of cut-off temperatures and durations were used to define heatwave. Multivariable analyses were also performed to adjust for socio-economic factors, demographic factors, meteorological factors, and ambient air pollutants.

Main outcome measure Spontaneous preterm births.

Results The adjusted hazard ratios (HRs) ranged from 1.13 (95% CI 1.03–1.24) to 2.00 (95% CI 1.37–2.91) by using different heatwave definitions, after controlling for demographic, socio-economic, and meteorological factors, and air pollutants.

Conclusions Heatwave was significantly associated with preterm birth: the associations were robust to the definitions of heatwave. The threshold temperatures, instead of duration, could be more likely to influence the evaluation of birth-related heatwaves. The findings of this study may have significant public health implications as climate change progresses.
Keyword Hazards ratio
Preterm birth
Survival analysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 20 AUG 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Public Health Publications
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 26 times in Scopus Article | Citations
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Created: Tue, 01 Oct 2013, 22:48:31 EST by Yuming Guo on behalf of School of Public Health