The effects of ambient temperature on cerebrovascular mortality: an epidemiologic study in four climatic zones in China

Zhang, Yanshen, Li, Shanshan, Pan, Xiaochuan, Tong, Shilu, Jaakkola, Jouni J. K., Gasparrini, Antonio, Guo, Yuming and Wang, Sheng (2014) The effects of ambient temperature on cerebrovascular mortality: an epidemiologic study in four climatic zones in China. Environmental Health, 13 1: 24.1-24.12. doi:10.1186/1476-069X-13-24

Author Zhang, Yanshen
Li, Shanshan
Pan, Xiaochuan
Tong, Shilu
Jaakkola, Jouni J. K.
Gasparrini, Antonio
Guo, Yuming
Wang, Sheng
Title The effects of ambient temperature on cerebrovascular mortality: an epidemiologic study in four climatic zones in China
Journal name Environmental Health
ISSN 1476-069X
Publication date 2014-04-01
Sub-type Article (original research)
DOI 10.1186/1476-069X-13-24
Open Access Status DOI
Volume 13
Issue 1
Start page 24.1
End page 24.12
Total pages 12
Place of publication London, United Kingdom
Publisher BioMed Central
Collection year 2015
Language eng
Formatted abstract
Background: Little evidence is available about the association between temperature and cerebrovascular mortality in China. This study aims to examine the effects of ambient temperature on cerebrovascular mortality in different climatic zones in China.

Method: We obtained daily data on weather conditions, air pollution and cerebrovascular deaths from five cities (Beijing, Tianjin, Shanghai, Wuhan, and Guangzhou) in China during 2004-2008. We examined city-specific associations between ambient temperature and the cerebrovascular mortality, while adjusting for season, long-term trends, day of the week, relative humidity and air pollution. We examined cold effects using a 1°C decrease in temperature below a city-specific threshold, and hot effects using a 1°C increase in temperature above a city-specific threshold. We used a meta-analysis to summarize the cold and hot effects across the five cities.

Results: Beijing and Tianjin (with low mean temperature) had lower thresholds than Shanghai, Wuhan and Guangzhou (with high mean temperature). In Beijing, Tianjin, Wuhan and Guangzhou cold effects were delayed, while in Shanghai there was no or short induction. Hot effects were acute in all five cities. The cold effects lasted longer than hot effects. The hot effects were followed by mortality displacement. The pooled relative risk associated with a 1°C decrease in temperature below thresholds (cold effect) was 1.037 (95% confidence interval (CI): 1.020, 1.053). The pooled relative risk associated with a 1°C increase in temperature above thresholds (hot effect) was 1.014 (95% CI: 0.979, 1.050).

Conclusion: Cold temperatures are significantly associated with cerebrovascular mortality in China, while hot effect is not significant. People in colder climate cities were sensitive to hot temperatures, while people in warmer climate cities were vulnerable to cold temperature. 
Keyword Cerebrovascular disease
Time series analysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Public Health Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 12 May 2014, 10:40:09 EST by Yuming Guo on behalf of School of Public Health