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KMID : 0365220120490020109
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Korean Journal of Public Health
2012 Volume.49 No. 2 p.109 ~ p.113
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Comparison of Models Combined Temperature and Humidity Variables in Temperature-Mortality Study
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Lee Young-Eun
Lim Youn-Hee
Kim Ho
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Abstract
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Many studies defined daily meteorological conditions such as temperature or humidity and mortality had some association and emphasized other meteorological variable like relative temperature or absolute humidity in this association study. We will estimate the best model for the association study by comparing 4 combination models including daily mean temperature or normalized temperature and relative humidity or absolute humidity. We analyzed 1992-2009 years, 6 major cities in Korea (Seoul, Busan, Deagu, Incheon, Gwangju and Daejeon)data. First, we set the basic model using generalized additive model (GAM)with temperature variable, humidity variable, time trends and day of week variable. From the basic model, we got 4 combination models, daily mean temperature and relative humidity model(M1), daily mean temperature and absolute humidity model(M2), normalized temperature and relative humidity model(M3) and normalized temperature and absolute humidity model(M4). We compared the AIC between the 4 models to find out the best combination model in the study. In comparisons same temperature variable but different humidity variable, absolute humidity models have the smaller AIC. In comparisons same humidity variable but different temperature variable, daily mean temperature models have the smaller AIC. In comparisons 4 models, daily mean temperature and absolute humidity model(M2)have the minimum AIC value among 4 models in every cities except Gwangju in Korea.
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KEYWORD
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Temperature, Mortality, Relative Humidity, Absolute humidity
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