Deaths from Pesticide Poisoning in Japan, 1968-2005: Data from Vital Statistics

Objective: We analyzed the number of deaths due to poisoning by pesticides over 38 years through vital statistics published annually by the Ministry of Health, Labour and Welfare of the Japanese government, from 1968 through 2005. Materials and Methods: Data not published as vital statistics were obtained from the Ministry of Health, Labour and Welfare Statistics and Information Department. The vital statistics provide the numbers of deaths with individual causes of death classified by sex and 5-year age group. We also calculated age-adjusted death rates by this classification, using a direct method based on the 1985 Japanese model population. Results: Deaths from pesticide poisoning increased rapidly beginning in 1982, reached a peak in 1986 (death rate per 100,000 population: 2.6 in males and 1.7 in females) and declined gradually thereafter. In the most recent several years, these figures have declined to levels previously unseen (death rate per 100,000 population: 0.4 in males and 0.3 in females). A difference in death rates between the sexes was observed at every age level, with death rates of males approximately 1.1-1.5-fold those of females. In the 1985-1987 data, these figures were highest in the three prefectures of northern Kanto (Tochigi, Gunma, and Ibaraki Prefectures; crude death rates per 100,000 population: 6.8, 6.8, 6.2, respectively), followed by that in Kagoshima Prefecture (5.0). In the 2003-2005 data, the figure was highest in southern Kyushu (Miyazaki Prefecture; crude death rate per 100,000 population: 1.9), followed by Tochigi (1.6), Ibaraki (1.4), and Kagoshima (1.4). Conclusions: Deaths from pesticide poisoning were extremely well correlated to the history of paraquat. Through the 1985 Advisory Resolution on Paraquat Regulations by the Japanese Association of Rural Medicine and other public health-oriented efforts, the concentration of highly fatal paraquat formulations was reduced, leading to discontinuation of its production, customer identification was strictly enforced when purchasing pesticides, and people's safety consciousness regarding pesticides improved. We regard and these developments as having had the greatest contribution to the reduction in deaths from pesticide poisoning.