title: Cognitive impairment and dementia in Parkinson's disease: a controlled study.
abstract: The performance of 47 patients with Parkinson's disease on a battery of tests of cognition, motor function, disability and mood was compared with the performance of 47 healthy control subjects who were matched to the patients on the basis of age, sex and pre-morbid IQ. An increased prevalence of impairment over a range of cognitive functions was observed in the Parkinson's disease patients as compared with their matched controls. The differences between the Parkinson's disease patients and controls could not be accounted for by factors such as depressed mood, effects of medication or motor impairment. Our findings are discussed in relation to the methodology of previous studies in this area and to the need for a comprehensive clinico-pathological longitudinal study.
authors.affiliation: Department of Psychiatry, University of Leeds.
authors.forename: J L
authors.initials: JL
authors.lastname: Boyd
authors.forename: C A
authors.initials: CA
authors.lastname: Cruickshank
authors.forename: C W
authors.initials: CW
authors.lastname: Kenn
authors.forename: P
authors.initials: P
authors.lastname: Madeley
authors.forename: R H
authors.initials: RH
authors.lastname: Mindham
authors.forename: A G
authors.initials: AG
authors.lastname: Oswald
authors.forename: R J
authors.initials: RJ
authors.lastname: Smith
authors.forename: E G
authors.initials: EG
authors.lastname: Spokes
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology; D000342:Affective Symptoms / Q000175:diagnosis / Q000523:psychology; D000368:Aged; D003072:Cognition Disorders / Q000175:diagnosis* / Q000523:psychology; D015331:Cohort Studies; D003704:Dementia / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination; D009483:Neuropsychological Tests; D010300:Parkinson Disease / Q000175:diagnosis* / Q000523:psychology; D014888:Wechsler Scales