1996 Volume 35 Issue 4 Pages 276-279
The prevalence of Parkinson's disease (PD) was investigated in Hokkaido, the northernmost island of Japan. A pilot case-finding study was carried out to estimate the prevalence in the entire island of Hokkaido (population = 5, 643, 647) initially, then we surveyed the prevalence at one of the smaller cities, Iwamizawa City (population = 80, 417). We ascertained 5, 342 cases with PD in Hokkaido and 77 cases in Iwamizawa City, estimating the crude prevalence of 94.7/100, 000 in Hokkaido (June 30, 1993) and 95.8/100, 000 in Iwamizawa City (April 1, 1994), respectively. We calculated that the crude prevalence rate of PD in Japan is currently close to 100/100, 000, but the age-adjusted prevalence is still low, compared with those in Europe and North America.
(Internal Medicine 35: 276-279, 1996)