The change in daily mean surface air temperature and the diurnal temperature range (DTR = Tmax-Tmin) has a great impact on human health. The daily total mortality risk shows a บ-curve with daily mean temperature. The daily mean temperature with the lowest mortality risk is 26.4° C; temperature either above or below 26.4° c will increase the death risk. If the daily mean temperature is above 26.4°c, the mor¬tality risk will increase by 1.9% and the cardiovascular disease risk will increase by 3.5% with air temperature increasing by l°c, while there is no significant trend to the influence on respiratory system diseases. If daily mean temperature is below 26.4°c and temperature decreasing by l°c, the daily total mortality risk, the cardiovascular disease risk and the respiratory system diseases will increase by 1.2%, 2.5% and 2.0%, respec¬tively. High temperature events above 26.4°c have rapid and short-term impacts on mortality, and their relative risks generally peak in the same day and usu¬ally diminish within about 4 days. In contrast, the cold events with temperatures below 26.4°c have a slow and persistent impact on mortality. The rela¬tive risk generally peaks on the succeeding second or third day and its effects usually persist for 2 weeks or longer [Yang et al, 2012]. Therefore, the protective measures to low temperature should be maintained for two weeks or longer and should not stop immediately after the cold event ends.
The change in daily mean surface air temperature and the diurnal temperature range (DTR = Tmax-Tmin) has a great impact on human health. The daily total mortality risk shows a บ-curve with daily mean temperature. The daily mean temperature with the lowest mortality risk is 26.4° C; temperature either above or below 26.4° c will increase the death risk. If the daily mean temperature is above 26.4°c, the mor¬tality risk will increase by 1.9% and the cardiovascular disease risk will increase by 3.5% with air temperature increasing by l°c, while there is no significant trend to the influence on respiratory system diseases. If daily mean temperature is below 26.4°c and temperature decreasing by l°c, the daily total mortality risk, the cardiovascular disease risk and the respiratory system diseases will increase by 1.2%, 2.5% and 2.0%, respec¬tively. High temperature events above 26.4°c have rapid and short-term impacts on mortality, and their relative risks generally peak in the same day and usu¬ally diminish within about 4 days. In contrast, the cold events with temperatures below 26.4°c have a slow and persistent impact on mortality. The rela¬tive risk generally peaks on the succeeding second or third day and its effects usually persist for 2 weeks or longer [Yang et al, 2012]. Therefore, the protective measures to low temperature should be maintained for two weeks or longer and should not stop immediately after the cold event ends.
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