東京23区の熱中症死亡率と気温分布との関係: 2013年についての解析

摘要

近年，熱中症による全国の死者数は年間数百人，多い年は1000人を超える.年間の熱中症死者数や死亡率は夏季の気温と正の相関があり,また，日ごとの変動についても熱中症による死者数や救急搬送数と気温との間に強い対応関係がある.このように，時間的な変動においては熱中症被害と気温との関連がデータから明瞭に認められる.%The distribution of heat mortality in the ward area or Tokyo was examined on the basis of 135 cases that were subtracted from postmortem data of the Tokyo Medical Examiner's Office in 2013. It was found that heat mortality was higher in the periphery of the city than in its central part. The mortality of each ward was negatively correlated to the mean income with a coefficient of -0.49， which was statistically significant at the 5% level. For a given value of mean income, inland wards tended to show higher mortality than wards in other areas, in agreement with higher daytime temperature in the inland area. It was also found that the mortality in wards along Tokyo Bay tended to be higher in a period of higher temperature in the coastal area. These facts provide observational evidence for the dependence of the distribution of heat mortality on social and meteorological factors.