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The study of a population of 208,000 in a Midlands district of England has shown the prevalence of idiopathic Parkinson's disease to be 108.4 per 100,000. This is comparable with past studies in Carlisle, England, Rochester, Minnesota, and South-West Finland. Parkinsonism associated with cerebrovascular disease is evidently recognised and differentiated by general practitioners; post-encephalitic parkinsonism is not encountered and drug-induced parkinsonism is not common in this district. The major functional disability of a carefully assessed randomly selected group was found to relate to walking and hygiene. Nevertheless, the essential physical needs of those with Parkinson's disease appear to be well met in general.
Sutcliffe et al. (2009) studied this question.