Cohort Phenomena Shown on the Death Rate for ischemic Heart Disease in Japan after the World War II

Abstract

We already showed the Cohort Pheomenon on the death rate for the heart diseases in Japan recently; Here, we show the same phenomena on the death rate for ischemic heart disease in Japan, too, The death rate for ischemic heart disease in Japan was originally low about 50 years ago. In 1910, it showed only 0.9 per 100, 000 population, but it shows about 39 in 1975. It grew rather slowly until 1950, but it shows rapid increasing in rate after 1950. The Cohort Phenomena were shown after 1950 in two different phases in both sexes. The first one is that the generations born in 1905-10 and before showed a rapid acceralation of death rate in 1955-60 and the difference of the rate almost equal to ten years aging in those five years. The second one is the phenomon that was shown after 1960 and was a continuous acceralation of the death rates of each generation born in 1906-1.0 and before, namely, the older they grew the more acceralation increased, The Cohort Phenomena are discussed in the relation with urbanization that is shown in Japan in these years, especially with the gravitation of population toward the urban areas of Japan.