Research
Mortality and life expectancy of Yokkaichi Asthma patients, Japan: Late effects of air pollution in 1960–70s
-
* Corresponding author: Kazuhito Yokoyama kazuhito@doc.medic.mie-u.ac.jp
- † Equal contributors
1 Department of Public Health and Occupational Medicine, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-shi, Mie 514-8507, Japan
2 Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima-shi 734-8551, Japan
Environmental Health 2008, 7:8 doi:10.1186/1476-069X-7-8
Published: 26 February 2008Abstract
Background
The incidence of chronic obstructive pulmonary disease (COPD) and bronchial asthma began increasing in early 1960s in the population of Yokkaichi-city (Mie Prefecture, Japan). The cause of the disease was sulfur oxide air pollution, and it is known as Yokkaichi Asthma. The pollution markedly decreased by the end of 1970s; no new cases have been reported since 1988. This study aimed at examining the late effects of air pollution on the health of Yokkaichi Asthma patients.
Methods
Mortality rate and life expectancy of patients, registered between 1965 and 1988, were investigated from 1975 through 2000.
Results
Mortality rates for COPD and asthma in patients from Yokkaichi-city were significantly higher than in the whole population of Mie Prefecture. For all ages (except for males between 80 and 84 years in 1985), the life expectancy of both males and females were significantly reduced in patients from Yokkaichi-city as compared with the whole population of Mie Prefecture. The potential gains in life expectancy excluding the mortality for respiratory diseases including COPD and asthma were larger for all ages in patients from Yokkaichi-city.
Conclusion
Mortality and life expectancy were adversely affected in patients from Yokkaichi-city, despite the fact that the air pollution problem has been already solved.