Factor Analysis of the Apathy Scale in Parkinson's Disease.
Francesca V LopezGraham M L EglitDawn M SchiehserEva Pirogovsky-TurkIrene LitvanStephanie LessigJ Vincent FiloteoPublished in: Movement disorders clinical practice (2019)
The AS can be decomposed into two factors reflecting Motivation-Interest-Energy and Indifference symptoms. These factors are differentially associated with clinical variables, including cognition and independent activities of daily living, indicating the importance of evaluating apathy from a multidimensional perspective.