最近のわが国における結核死亡率の推移について

抄録

A review was made of changes in cohort tuberculosis death rates in Japan since 1900 in reference to periodical epidemiological considerations in order to study the recent tuberculosis deach rates on age classification.
1. Yearly changes in tuberculosis death rates on age classification resulted in the following four classifications.
The first period: The latter Meiji era (the Meiji era covered 1868-1912) when tuberculosis death rates increased for all age groupsthe initial time of epidemic.
The secound period: The period between the beginning of Taisho era (the Taisho era covered 1912-1916) and the Shanghai incident (1933) when tuberculosis death rates yearly increased for the young generation showing a gradual decrese for the other age groupsthe time of prolonged high tuberculosis death rate.
The third period: The period between 1933 and the end of World War 11 (1945) when tuberculosis death rates for all age groups especially for the younger generation rapidly increasedthe secand time of epidemic. The fourth period: The period since 1945 to date when tuberculosis death rates for all ages have shown a yearly decreasethe time of decreasing tuberculosis death rates.
2. The changes in cohort death rates were represented as follows:
1) Those, especially females, who had been born in 1866-1880 and who had passed their tuberculous susceptible days in the initial time of epidemic showed yearly increasing tuberculosis death rates during their adolescence.2) Those who had been born in 1881-1905 and who had passed the initial time of epidemic in their adolescence and the latter half of their active days in the second time of epidemic showed their tuberculosis death rates slightly high in their infancy, considerably high in their adolescence being followed by another elevation in their adult days.
3) Those who had been born in 1906-1925 who had passed their adolescence during World War 11 showed very high tuberculosis death rates in their adolescence and rapidly decreased tuberculosis death rates in the time of decreasing tuberculosis death rates.
4) Those who had been born in 1926-1935 and who had passed their young and adolescent days in the post-war period showed slightly high tuberculosis death rates in their infancy and adolescence.
5) Those who had been born after 1936 showed slightly high tuberculosis death rates in their infancy. The rates, however, showed a gradual decrease with advanced age.
3. Tuberculosis death rates on male age classification in 1955 showed a gradually increasing curve for thirties showing an increase with age reaching the highest for sixties followed by a gradual decrease. Since females showed less tuberculosis death rates in the old than males, they showed bi-peaked curve which pertained to a 25-34 year group and sixties. The young age group had been born in 1906-1920 and their adolescence and adult, i. e. tuberculosis susceptible days, were spent during World War II. The old age group composed of those who had been born in 1885-1894 and who had spent their adolescence in the latter part of the Meiji era and their fifties during World War II. It is understood that the present tuberculous death rate curves on age classification indicate the wake of tuberculosis attack suffered by the respective age groups.