Approximately what percentage of Parkinson's disease patients develop dementia, with risk increasing with age?

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Multiple Choice

Approximately what percentage of Parkinson's disease patients develop dementia, with risk increasing with age?

Dementia is a common late non-motor complication of Parkinson’s disease, and the risk grows with age and longer disease duration. Across many studies, about one in five people with Parkinson’s (roughly 20%) develop dementia at some point. This baseline estimate fits the typical clinical picture, while the likelihood increases for older patients and as PD progresses. Though some cohorts show higher cumulative rates over many years (well above 20%), the most widely cited approximate figure for a general PD population is around 20%, making it the best single estimate for this question.

Dementia is a common late non-motor complication of Parkinson’s disease, and the risk grows with age and longer disease duration. Across many studies, about one in five people with Parkinson’s (roughly 20%) develop dementia at some point. This baseline estimate fits the typical clinical picture, while the likelihood increases for older patients and as PD progresses. Though some cohorts show higher cumulative rates over many years (well above 20%), the most widely cited approximate figure for a general PD population is around 20%, making it the best single estimate for this question.

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