Objective: Apathy is highly prevalent in Parkinson's disease (PD), but little is known about subtypes of apathy symptoms in this disease. The current study examined PD patients and healthy controls (HC) on the Apathy Scale (AS) to determine whether (1) meaningful subscales on the AS could be identified, (2) PD and HC groups differed on these subscales, and (3) the AS subscales were differentially associated with important disease-related variables. Method: PD (n = 149) and HC participants (n = 67) were administered the AS, and PD patients’ responses were subjected to a principal component analysis (PCA). Groups were then compared on the factor scores using repeated measures ANOVA with gender as a covariate. PD patients’ factor scores were also correlated with age, education, global cognition, motor symptoms, dopamine equivalency levels, anxiety, depression, and health-related quality of life (HRQOL). Results: Results identified two factors that accounted for 41.3% of the variance...

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