Relationship between heat index and mortality of 6 major cities in Taiwan

Tzu I. Sung, Pei Chih Wu, Shih Chun Lung, Chuan Yao Lin, Mu Jean Chen, Huey-Jen Su

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Increased mortality, linked to events of extreme high temperatures, is recognized as one critical challenge to the public health sector. Therefore, this ecological study was conducted to assess whether this association is also significant in Taiwan and the characteristics of the relationship. Daily mean heat indices, from 1994 through 2008, were used as the predictor for the risk of increased mortality in populations from 6 major Taiwanese cities. Daily mortality data from 1994 through 2008 were retrieved from the Taiwan Death Registry, Department of Health, Taiwan, and meteorological data were acquired from the Central Weather Bureau. Poisson regression analyses using generalized linear models were applied to estimate the temperature-mortality relationship. Daily mean heat indices were calculated and used as the temperature metric. Overall, increased risk ratios in mortality were associated with increased daily mean heat indices. Significantly increased risk ratios of daily mortality were evident when daily mean heat indices were at and above the 95th percentile, when compared to the lowest percentile, in all cities. These risks tended to increase similarly among those aged 65. years and older; a phenomenon seen in the cities of Keelung, Taipei, Taichung, Tainan, and Kaohsiung, but not Chiayi. Being more vulnerable to heat stress is likely restricted to a short-term effect, as suggested by lag models which showed that there was dominantly an association during the period of 0 to 3. days. In Taiwan, predicting city-specific daily mean heat indices may provide a useful early warning system for increased mortality risk, especially for the elderly. Regional differences in health vulnerabilities should be further examined in relation to the differential social-ecological systems that affect them.

Original languageEnglish
Pages (from-to)275-281
Number of pages7
JournalScience of the Total Environment
Volume442
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

mortality
Health
mortality risk
early warning system
Alarm systems
Public health
Temperature
index
city
Hot Temperature
public health
vulnerability
temperature
weather
health

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

Sung, Tzu I. ; Wu, Pei Chih ; Lung, Shih Chun ; Lin, Chuan Yao ; Chen, Mu Jean ; Su, Huey-Jen. / Relationship between heat index and mortality of 6 major cities in Taiwan. In: Science of the Total Environment. 2013 ; Vol. 442. pp. 275-281.
@article{88281e35fc234c78b618522d8ffc565e,
title = "Relationship between heat index and mortality of 6 major cities in Taiwan",
abstract = "Increased mortality, linked to events of extreme high temperatures, is recognized as one critical challenge to the public health sector. Therefore, this ecological study was conducted to assess whether this association is also significant in Taiwan and the characteristics of the relationship. Daily mean heat indices, from 1994 through 2008, were used as the predictor for the risk of increased mortality in populations from 6 major Taiwanese cities. Daily mortality data from 1994 through 2008 were retrieved from the Taiwan Death Registry, Department of Health, Taiwan, and meteorological data were acquired from the Central Weather Bureau. Poisson regression analyses using generalized linear models were applied to estimate the temperature-mortality relationship. Daily mean heat indices were calculated and used as the temperature metric. Overall, increased risk ratios in mortality were associated with increased daily mean heat indices. Significantly increased risk ratios of daily mortality were evident when daily mean heat indices were at and above the 95th percentile, when compared to the lowest percentile, in all cities. These risks tended to increase similarly among those aged 65. years and older; a phenomenon seen in the cities of Keelung, Taipei, Taichung, Tainan, and Kaohsiung, but not Chiayi. Being more vulnerable to heat stress is likely restricted to a short-term effect, as suggested by lag models which showed that there was dominantly an association during the period of 0 to 3. days. In Taiwan, predicting city-specific daily mean heat indices may provide a useful early warning system for increased mortality risk, especially for the elderly. Regional differences in health vulnerabilities should be further examined in relation to the differential social-ecological systems that affect them.",
author = "Sung, {Tzu I.} and Wu, {Pei Chih} and Lung, {Shih Chun} and Lin, {Chuan Yao} and Chen, {Mu Jean} and Huey-Jen Su",
year = "2013",
month = "1",
day = "1",
doi = "10.1016/j.scitotenv.2012.09.068",
language = "English",
volume = "442",
pages = "275--281",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

Relationship between heat index and mortality of 6 major cities in Taiwan. / Sung, Tzu I.; Wu, Pei Chih; Lung, Shih Chun; Lin, Chuan Yao; Chen, Mu Jean; Su, Huey-Jen.

In: Science of the Total Environment, Vol. 442, 01.01.2013, p. 275-281.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Relationship between heat index and mortality of 6 major cities in Taiwan

AU - Sung, Tzu I.

AU - Wu, Pei Chih

AU - Lung, Shih Chun

AU - Lin, Chuan Yao

AU - Chen, Mu Jean

AU - Su, Huey-Jen

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Increased mortality, linked to events of extreme high temperatures, is recognized as one critical challenge to the public health sector. Therefore, this ecological study was conducted to assess whether this association is also significant in Taiwan and the characteristics of the relationship. Daily mean heat indices, from 1994 through 2008, were used as the predictor for the risk of increased mortality in populations from 6 major Taiwanese cities. Daily mortality data from 1994 through 2008 were retrieved from the Taiwan Death Registry, Department of Health, Taiwan, and meteorological data were acquired from the Central Weather Bureau. Poisson regression analyses using generalized linear models were applied to estimate the temperature-mortality relationship. Daily mean heat indices were calculated and used as the temperature metric. Overall, increased risk ratios in mortality were associated with increased daily mean heat indices. Significantly increased risk ratios of daily mortality were evident when daily mean heat indices were at and above the 95th percentile, when compared to the lowest percentile, in all cities. These risks tended to increase similarly among those aged 65. years and older; a phenomenon seen in the cities of Keelung, Taipei, Taichung, Tainan, and Kaohsiung, but not Chiayi. Being more vulnerable to heat stress is likely restricted to a short-term effect, as suggested by lag models which showed that there was dominantly an association during the period of 0 to 3. days. In Taiwan, predicting city-specific daily mean heat indices may provide a useful early warning system for increased mortality risk, especially for the elderly. Regional differences in health vulnerabilities should be further examined in relation to the differential social-ecological systems that affect them.

AB - Increased mortality, linked to events of extreme high temperatures, is recognized as one critical challenge to the public health sector. Therefore, this ecological study was conducted to assess whether this association is also significant in Taiwan and the characteristics of the relationship. Daily mean heat indices, from 1994 through 2008, were used as the predictor for the risk of increased mortality in populations from 6 major Taiwanese cities. Daily mortality data from 1994 through 2008 were retrieved from the Taiwan Death Registry, Department of Health, Taiwan, and meteorological data were acquired from the Central Weather Bureau. Poisson regression analyses using generalized linear models were applied to estimate the temperature-mortality relationship. Daily mean heat indices were calculated and used as the temperature metric. Overall, increased risk ratios in mortality were associated with increased daily mean heat indices. Significantly increased risk ratios of daily mortality were evident when daily mean heat indices were at and above the 95th percentile, when compared to the lowest percentile, in all cities. These risks tended to increase similarly among those aged 65. years and older; a phenomenon seen in the cities of Keelung, Taipei, Taichung, Tainan, and Kaohsiung, but not Chiayi. Being more vulnerable to heat stress is likely restricted to a short-term effect, as suggested by lag models which showed that there was dominantly an association during the period of 0 to 3. days. In Taiwan, predicting city-specific daily mean heat indices may provide a useful early warning system for increased mortality risk, especially for the elderly. Regional differences in health vulnerabilities should be further examined in relation to the differential social-ecological systems that affect them.

UR - http://www.scopus.com/inward/record.url?scp=84869884207&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84869884207&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2012.09.068

DO - 10.1016/j.scitotenv.2012.09.068

M3 - Article

VL - 442

SP - 275

EP - 281

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -