A systematic review of prevalence studies of dementia in Parkinson's disease

By Dag Aarsland, J. Zaccai, Carol Brayne. Movement Disorders, 2005

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Evolution of cognitive dysfunction in an incident Parkinson's disease cohort. (2007, background): “Dementia in particular is a common feature of the disease, with an estimated prevalence of between 24 and 31% (Aarsland et al., 2005b).”
The prevalence of neuropsychiatric symptoms in Alzheimer's disease: Systematic review and meta-analysis. (2016, background): “Moreover, studies conducted in the clinical setting are easily subjected to referral bias, which might overestimate the prevalence (Lyketsos et al., 2002; Reijnders et al., 2008).”
Subtypes of mild cognitive impairment in parkinson's disease: Progression to dementia (2006, background): “(1) The multiple choice version of the Benton Visual”
Metabolic brain networks associated with cognitive function in Parkinson's disease (2007, background): “However, cognitive deficits and behavioral abnormalities are also well documented as part of the illness, with a prevalence of dementia ranging from 24% to 31% (Aasland et al., 2005).”