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Apathy and Depression: Separate Factors in Parkinson's Disease

  • Lindsey Kirsch-Darrow (a1), Michael Marsiske (a1), Michael S. Okun (a2), Russell Bauer (a1) and Dawn Bowers (a1) (a2)...
Abstract
Abstract

The objective of this study was to test the hypothesis that apathy and depression are dissociable in Parkinson disease (PD) by conducting a confirmatory factor analysis (CFA) of items from two commonly used mood scales. A total of 161 non-demented PD patients (age = 64.1; ± 8.4 years) were administered the Apathy Scale and the Beck Depression Inventory-II. Items were hypothesized to load onto four factors: (1) an apathy factor representing loss of motivation, (2) dysphoric mood factor representing sadness and negativity, (3) loss of interest/pleasure factor representing the features common to both apathy and depression, and (4) a somatic factor representing bodily complaints. Results indicated a good fit for the overall CFA model, χ2 (128, N = 146) = 194.9; p<.01. RMSEA was .060 (p = .16). The four-factor model was significantly better than all alternative nested models at p < .001, including an overarching single factor model, representing “depression.” Results support the concept that apathy and depression are discrete constructs. We suggest a “factor based” scoring of the Apathy Scale and Beck Depression Inventory-II that disentangles symptoms related to apathy, depression, overlapping symptoms, and somatic complaints. Such scoring may be important in providing useful information regarding differential treatment options. (JINS, 2011, 17, 1058–1066)

Copyright
Corresponding author
Correspondence and reprint requests to: Dawn Bowers, Department of Clinical & Health Psychology, University of Florida, Gainesville, FL 32611. E-mail: dawnbowers@phhp.ufl.edu
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