Relationship between the Number of Deaths due to Renal Failure and Meteorological Parameters in Japan: An Ecological Study

Objective: The aim of this study was to clarify the relationship between the number of deaths due to renal failure and meteorological parameters, such as air temperature and humidity, in Japan.Methods: The number of deaths due to renal failure and population of each of the 47 prefectures in Japan from 2016 to 2019 were obtained from official websites. Meteorological parameters, such as air temperature and humidity, in the same period were obtained from the Japan Meteorological Agency during same period. The relationship between the population-adjusted number of deaths due to renal failure and metrological parameters were evaluated by an ecological study.Results: The number of deaths due to renal failure was significantly correlated with some air temperature parameters and mean humidity. Multiple regression analysis showed that mean humidity (women) was important factor for the number of deaths due to renal failure.Conclusion: These results suggest that metrological parameters, especially mean humidity, are closely associated with the number of deaths due to renal failure.目的：日本における腎不全による死亡者数と気温や湿度等の気象パラメータとの関係を明らかにした．方法：2016 年から2019 年までの47 都道府県における腎不全による死亡者数と人口は政府統計公式web サイトから取得した．同時期の気温や湿度等の気象パラメータは，気象庁公式webサイトから取得した．腎不全による人口調整死亡数と気象パラメータとの関係は，生態学的研究によって検討した．結果：腎不全による死亡者数は，いくつかの気温パラメータ及び平均湿度と有意に相関していた．重回帰分析の結果は，女性において，平均湿度が腎不全による死亡者数の重要な要因であることを示した．結論：気象パラメータ，特に平均湿度が腎不全による死亡者数と関連していた．