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Updated: Jul 22, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
Published on: July 24, 2019
Cognitive Functional Abilities in Parkinson's Disease: Agreement Between Patients and Informants
Benjamin L Deck1,2, Sharon X Xie3, Gyujae Choi4
1Departments of Neurology, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA.
Background:
The Penn Parkinson's Daily Activities Questionnaire-15 (PDAQ-15) assesses cognition-related instrumental activities of daily living (IADL) in Parkinson's disease (PD).
Objectives:
To assess the degree and predictors of disagreement between patients (PT) and knowledgeable informants (KI) on the PDAQ-15.
Methods:
We recruited 254 PT and KI pairs (PT-KI), determined predictors of agreement, and compared scores to a performance-based functional measure (Direct Assessment of Functional Status [DAFS]; N = 61).
Results:
PT and KI total score (intraclass correlation = 0.57) and individual item (Cohen's kappa = 0.46-0.62) agreement were moderate. Patient depression, global cognition, and caregiver burden (all P < 0.05), predicted PT-KI discrepancy. PT-KI discrepancy was highest in patients with a dementia diagnosis, followed by mild cognitive impairment and then normal cognition (all P < 0.01), with PT rating themselves relatively more functionally intact as cognition worsened. DAFS performance was more highly correlated with KI (r = 0.82; P < 0.001) than PT (r = 0.62; P < 0.001) PDAQ-15 score.
Conclusions:
Our results support using KI as proxies when assessing cognitive IADLs in PD PTs, particularly in cases of more advanced cognitive decline.
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