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| Area | (Country) | Study period | Incidence (per 105 population) |
| Wakayama | (Japan) | 1997 | 16.9 [95% CI:14.5-19.3] |
| Rochester | (USA) | 1945-1954 | 23.8* |
| Rochester | (USA) | 1967-1979 | 19.7* |
| Carlisle | (UK) | 1951-1961 | 12.1* |
| Iceland | (Iceland) | 1953-1963 | 16.0 |
| Sardinia | (Italy) | 1961-1971 | 4.9 |
| Yonago | (Japan) | 1975-1978 | 10.2 |
| Yonago | (Japan) | 1989-1992 | 15.0 |
*: Parkinsonism cases were included.
