Abstract
Death and death rate from peptic ulcer were studied by cohort analysis in Japan, England & Wales, United States and Sweden pre-and post-World War II by 5 yeays period. Until the end of the war, three enemy nations of them showed gradual elevation of death rate in male, but in female except Japan. The elevation of japanese male was a marked one, and english male, american male and japanese female follow in this order. Female in England and US did not show the elevation with both sexes of the neutral nation. Through cohort analysis by 5 years period, the elevated risk to death in the adult age groups showed fixed continuation several years, namely, the?gCohort Phenomenon?h. The elevation of death risk was the highest in japanese male and in senior age group, and the continuation of it was the longest in the same, too. In Japan, the crude death rate from the peptic ulcer showed gradual decreasing after the war, and the transition was shown in the same pattern with socio-economic and cultural background through principal component analysis.
