title: [Impact of air temperature on years of life lost among residents in Guangzhou and Zhuhai: a time-series study].
abstract: OBJECTIVE
  To evaluate the impacts of air temperature on years of life lost (YLL) among the residents in Guangzhou and Zhuhai, Guangdong province.
  
  
  METHODS
  Daily mortality and meteorology data in Guangzhou and Zhuhai were collected, and distributed lag non-linear model (DLNM) was used to evaluate the cumulative and delayed effects of daily air temperature on YLL of total non-accident mortality. The accumulative effect of air temperature on mortality under the extreme high temperature (0-1 days) and extreme low temperature (0-13 days) situation in Guangzhou and Zhuhai were analyzed respectively.
  
  
  RESULTS
  The average YLL was 1 928.0 in Guangzhou and 202.5 in Zhuhai. The exposure-response functions seemed to be non-linear. The hot effect seemed to be acute and reached the peak at the same day, while the cold effect reached the peak at 5(th) days and lasted for about two weeks. Low temperature had stronger gross effect than high temperature had. The cold effect among males was greater than that among females in Guangzhou. The hot/cold effect on YLL was greater in people aged ≥ 65 years than in people aged < 65 years and in people suffering from respiratory disease than in people suffering from cardiovascular disease in both Guangzhou and Zhuhai.
  
  
  CONCLUSIONS
  The effects of high and low temperatures on YLL were obvious, and the impact of low temperature was greater. The elderly and people suffering from respiratory disease or cardiovascular disease are the vulnerable populations.
authors.affiliation: School of Medicine, Jinan University, Guangzhou 510632, China.
authors.forename: Zhihao
authors.initials: Z
authors.lastname: Li
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention.
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Guangzhou Municipal Center for Disease Control and Prevention.
authors.forename: Guozhen
authors.initials: G
authors.lastname: Lin
authors.affiliation: Zhuhai Municipal Center for Disease Control and Prevention.
authors.forename: Deyun
authors.initials: D
authors.lastname: Li
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health.
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health.
authors.forename: Hualiang
authors.initials: H
authors.lastname: Lin
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health.
authors.forename: Jianpeng
authors.initials: J
authors.lastname: Xiao
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health.
authors.forename: Weilin
authors.initials: W
authors.lastname: Zeng
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health.
authors.forename: Xing
authors.initials: X
authors.lastname: Li
authors.affiliation: Guangdong Provincial Center for Disease Control and Prevention; Guangdong Provincial Institute of Public Health; Email: mwj68@vip.tom.com.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Ma
mesh_terms: D000368:Aged; D000388:Air; D002318:Cardiovascular Diseases / Q000453:epidemiology; D002681:China / Q000453:epidemiology; D055873:Extreme Cold / Q000009:adverse effects*; D055874:Extreme Heat / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D061213:Mortality, Premature; D017711:Nonlinear Dynamics; D012140:Respiratory Tract Diseases / Q000453:epidemiology; D013997:Time Factors