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The effects of temperature on human mortality in a Chinese city: burden of disease calculation, attributable risk exploration, and vulnerability identification

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Abstract

Few studies have examined the attributable fraction (AF) of temperature to mortality and Years of Life Lost (YLL), especially in developing countries. This study aims to explore the short-term effect of the cold and hot temperatures on the cause-specific YLL and mortality, discover the attributable contributions from the temperature variations, and identify the vulnerable populations in Weifang, China. Daily registered death information and meteorological data over the period 2010–2016 were obtained in Weifang, a northern Chinese city. Generalized additive Poisson and Gaussian regression models were used to assess the impacts of temperatures on both mortality and YLL, explore the AF of the temperature variations on mortality, after adjusting for other covariates. Both hot and cold temperatures have had significant negative impacts on cause-specific mortality counts and YLL, with heat presented an acute and short effect and the cold temperatures had delayed effects and lasted for several days. In terms of the attributable fraction calculations, the contributions from cold effects was higher than that of hot effects on non-accidental, cardiovascular, and respiratory deaths (YLL 10.88 vs. 1.23%, 19.58 vs. 1.71%, and 14.47 vs. 3.05%; mortality 13.97 vs. 1.65%, 19.20 vs. 1.59%, and 14.89 vs. 3.09%), respectively. The elderly and women and people with low education level were the most vulnerable. The findings will provide important scientific evidences and policy implications for developing adaptation strategies to reduce the adverse effect of cold and hot exposure in Weifang, in terms of resource allocation, healthcare workforce capacity building, and community health education, especially for the vulnerable groups.

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Abbreviations

AF:

Attributable fraction

YLL:

Years of life lost

RR:

Relative risk

OR:

Odds ratio

AN:

Attributable number

DALYs:

Disability-adjusted-life-years

CDC:

Center for Disease Control and Prevention

ICD:

International Classification of Diseases

WHO:

World Health Organization

GAM:

Generalized Additive Model

DLNM:

Distributed lag nonlinear model

MMT:

Minimum-mortality temperature

CI:

Confidence interval

TV:

Temperature variability

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Acknowledgements

This study was supported by the Social Science Planning Research Project of Shandong Province (18CQXJ18), Medicine and Health of Shandong Province for Science and Technology Development Program (2017WS703, 2016WS0664), Science and Technology Project of Shandong Health Science and Technology Association, and State Key Laboratory of Infectious Disease Prevention and Control Program of China (2018SKLID306). The authors are grateful to the Weifang Center for Disease Control and Prevention sharing with us the information needed for this study.

Funding

This study was supported by the Science and Technology Development Program for Medicine and Health of Shandong Province (2017WS703, 2016WS0664), Social Science Planning Research Project of Shandong Province (18CQXJ18), and State Key Laboratory of Infectious Disease Prevention and Control Program of China (2018SKLID306).

Author information

Authors and Affiliations

Authors

Contributions

JL and XX conceived and designed the study; ZC, XH, NL, and XM collected the data; ZC, XH, CW, and QW performed the data analysis; JL and XX drafted the manuscript; QL and PB provided significant intellectual advice. PB helped revise the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Jing Li.

Ethics declarations

Conflict of interest

The authors declare that they have no competing interests.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Additional information

Xin Xu, Zuosen Chen, and Xiyuan Huo are co-first authors

Highlights

• To our knowledge, the first few studies to explore the attributable fraction of ambient temperature on both mortality and YLL in China.

• Cold rather than heat contributed substantially to cause-specific YLLs and mortality.

• AF vulnerability on YLL and mortality to ambient temperature varied not only by classification of diseases, but also by demographic characteristics.

• Findings are important for public health decision-making and resource allocation due to extreme temperature in China.

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Xu, X., Chen, Z., Huo, X. et al. The effects of temperature on human mortality in a Chinese city: burden of disease calculation, attributable risk exploration, and vulnerability identification. Int J Biometeorol 63, 1319–1329 (2019). https://doi.org/10.1007/s00484-019-01746-6

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  • DOI: https://doi.org/10.1007/s00484-019-01746-6

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