Life expectancy for Yokkaichi Asthma patients and whole population of Mie Prefecture. Average with standard error of mean (SEM). SEM was less than 0.04–0.19 years for Mie Prefecture. Closed = patients, open = Mie Prefecture. Significantly different (p < 0.05) between Yokkaichi patients and Mie population for all age subgroups except for males aged 80–84 years in 1985 (t-test).