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Modifying Effect of Heat Waves on the Relationship between Temperature and Mortality.

Lee WK, Lee HA, Park H - J. Korean Med. Sci. (2016)

Bottom Line: The effect of temperature on mortality was the greatest in 1991-1995 in Seoul; no significant change was observed in Busan.Furthermore, heterogeneity was found in the modifying effect of heat waves on heat-related mortality in inland and coastal cities.The findings of this study help understand relations between temperature and mortality.

View Article: PubMed Central - PubMed

Affiliation: Department of Social and Preventive Medicine, Inha University School of Medicine, Incheon, Korea .

ABSTRACT
Studies conducted to evaluate temporal trends of heat-related mortality have not considered the effects of heat waves; although it is known they can affect mortality and act as a modifying factor. After adjusting for long-term trends and seasonality, the effects of temperature on non-accidental deaths in Seoul and Busan (inland and coastal cities, respectively) were analyzed using a generalized additive model of Poisson distribution. We evaluated temporal trends of heat-related mortalities in four periods (1991-1995, 1996-2000, 2001-2005, and 2006-2012). The effects of temperature on mortality were evaluated according to the occurrence of a heat wave and results were compared in the two cities. The effect of temperature on mortality was the greatest in 1991-1995 in Seoul; no significant change was observed in Busan. When we stratified the study period by heat wave status, the risk increase in mortality was 15.9% per 1℃ during years with a heat wave in Seoul, which was much higher than 0.31% increase observed during years without a heat wave. On the other hand, Busan showed a linear relationship between temperature and mortality and no significant difference between years with or without a heat wave. Variations in the relationship between temperature and mortality could be misunderstood if heat waves are not considered. Furthermore, heterogeneity was found in the modifying effect of heat waves on heat-related mortality in inland and coastal cities. The findings of this study help understand relations between temperature and mortality.

No MeSH data available.


Related in: MedlinePlus

Temporal trends from 1991 to 2012 including or excluding years with a heat wave in Seoul and Busan.Log RR means logarithm of relative risk of deaths attributable to 1℃ increase in daily mean temperature.Heat wave: 1994, 2012 in Seoul, 1994, 1996, 2001, 2006, 2012 in Busan.
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Figure 2: Temporal trends from 1991 to 2012 including or excluding years with a heat wave in Seoul and Busan.Log RR means logarithm of relative risk of deaths attributable to 1℃ increase in daily mean temperature.Heat wave: 1994, 2012 in Seoul, 1994, 1996, 2001, 2006, 2012 in Busan.

Mentions: Fig. 2 showed the temporal relationship between temperature and mortality in the two cities from 1991 to 2012. Overall, the increased risk of mortality for a 1℃ increase of daily mean temperature was 9.52% above 28.2℃ and 0.35% below 28.2℃ in Seoul. Seoul had higher risk increase in mortality above the threshold than below the threshold during the study periods. The impact of temperature on mortality from 1991 to 1995 was greater than during any other period. Risk increases in mortality above the threshold were 11.0% (95%CI: 9.19-12.8), 3.82% (95%CI: 2.50-5.16), 2.06% (95%CI: 1.47-2.65), and 5.18% (95%CI: 3.81-6.54) during the periods 1991-1995, 1996-2000, 2001-2005, and 2006-2012, respectively.


Modifying Effect of Heat Waves on the Relationship between Temperature and Mortality.

Lee WK, Lee HA, Park H - J. Korean Med. Sci. (2016)

Temporal trends from 1991 to 2012 including or excluding years with a heat wave in Seoul and Busan.Log RR means logarithm of relative risk of deaths attributable to 1℃ increase in daily mean temperature.Heat wave: 1994, 2012 in Seoul, 1994, 1996, 2001, 2006, 2012 in Busan.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835594&req=5

Figure 2: Temporal trends from 1991 to 2012 including or excluding years with a heat wave in Seoul and Busan.Log RR means logarithm of relative risk of deaths attributable to 1℃ increase in daily mean temperature.Heat wave: 1994, 2012 in Seoul, 1994, 1996, 2001, 2006, 2012 in Busan.
Mentions: Fig. 2 showed the temporal relationship between temperature and mortality in the two cities from 1991 to 2012. Overall, the increased risk of mortality for a 1℃ increase of daily mean temperature was 9.52% above 28.2℃ and 0.35% below 28.2℃ in Seoul. Seoul had higher risk increase in mortality above the threshold than below the threshold during the study periods. The impact of temperature on mortality from 1991 to 1995 was greater than during any other period. Risk increases in mortality above the threshold were 11.0% (95%CI: 9.19-12.8), 3.82% (95%CI: 2.50-5.16), 2.06% (95%CI: 1.47-2.65), and 5.18% (95%CI: 3.81-6.54) during the periods 1991-1995, 1996-2000, 2001-2005, and 2006-2012, respectively.

Bottom Line: The effect of temperature on mortality was the greatest in 1991-1995 in Seoul; no significant change was observed in Busan.Furthermore, heterogeneity was found in the modifying effect of heat waves on heat-related mortality in inland and coastal cities.The findings of this study help understand relations between temperature and mortality.

View Article: PubMed Central - PubMed

Affiliation: Department of Social and Preventive Medicine, Inha University School of Medicine, Incheon, Korea .

ABSTRACT
Studies conducted to evaluate temporal trends of heat-related mortality have not considered the effects of heat waves; although it is known they can affect mortality and act as a modifying factor. After adjusting for long-term trends and seasonality, the effects of temperature on non-accidental deaths in Seoul and Busan (inland and coastal cities, respectively) were analyzed using a generalized additive model of Poisson distribution. We evaluated temporal trends of heat-related mortalities in four periods (1991-1995, 1996-2000, 2001-2005, and 2006-2012). The effects of temperature on mortality were evaluated according to the occurrence of a heat wave and results were compared in the two cities. The effect of temperature on mortality was the greatest in 1991-1995 in Seoul; no significant change was observed in Busan. When we stratified the study period by heat wave status, the risk increase in mortality was 15.9% per 1℃ during years with a heat wave in Seoul, which was much higher than 0.31% increase observed during years without a heat wave. On the other hand, Busan showed a linear relationship between temperature and mortality and no significant difference between years with or without a heat wave. Variations in the relationship between temperature and mortality could be misunderstood if heat waves are not considered. Furthermore, heterogeneity was found in the modifying effect of heat waves on heat-related mortality in inland and coastal cities. The findings of this study help understand relations between temperature and mortality.

No MeSH data available.


Related in: MedlinePlus