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Page: Descriptive Epidemiology
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Parkinson's disease is widespread, with a prevalence estimated between 100 and 250 cases per 100,000 in North America; and was 1.7 per hundred (95% CI 1.5-1.9) in China (for those aged > or =65 years). Because prevalence rates can be affected by socio-ecomically driven differences in survival as well as biased by survey technique problems , incidence is a more sensitive indicator : rates to a high of 20.5 per 100,000 in the U.S.A.. A study carried out in northern California observed an age and sex corrected incidence.
Cases of PD are reported at all ages, though it is uncommon in people younger than 40. The average age at which symptoms begin in the U.S.A. is 58-60; it is principally a disease of the elderly. It occurs in all parts of the world, but appears to be more common in people of European ancestry than in those of African ancestry. Those of East Asian ancestry have an intermediate risk. It is more common in rural than urban areas and men are affected more often than women in most countries.
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