年齢構成標準化平均死亡年齢よりみたわが国の主要死因別死亡年齢の推移

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A method for calculating the mean age at death, standardized in terms of age structure of the population, was demonstrated. The epidemiological implication of mean age at death (crude and standardized) was studied, using Vital Statistics between 1955 and 1980 in Japan, in comparison with life expectancy and age-adjusted death rates.<BR>Crude mean age at death of all causes for both sexes has steadily increased during the observed period, while the increasing trend in the standardized mean age at death proved to be milder than that for the crude mean age at death, with a tendency to level off since 1965. Excluding deaths under fifteen years of age, the increase trend in standardized mean age at death was less clearly observed.<BR>When compared by cause of deaths, the standardized mean age at death from pneumonia and bronchitis was the highest, followed by cerebrovascular disease, heart disease, nephritis and nephrosis, tuberculosis, malignant neoplasm, and cirrhosis of the liver for males in 1980. For females in 1980, the above order by cause of deaths was about the same as that for males, although some exceptions were observed.<BR>In both sexes, the standardized mean age at death from cerebrovascular disease, heart disease, malignant neoplasm and tuberculosis were observed to increase during the entire period observed, while that from nephritis and nephrosis showed a temporary decrease around 1970 and a marked increase thereafter. For cirrhosis of the liver, a slightly decreasing trend among males and a steady trend among females were observed. The correlation between the standardized mean age at death and age-adjusted mortality rate was examined for each cause of death.<BR>Standardized mean age at death, which shows the expected mean survival years for the contemporary population, seems to be a useful indicator for epidemiological studies.
日本衛生学会の論文

年齢構成標準化平均死亡年齢よりみたわが国の主要死因別死亡年齢の推移

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