Research Article
An Exploration of Apathy and Impulsivity in Parkinson Disease
Table 2
Rotated component matrix for the Barratt Impulsiveness Scale-11 resulting in a five-factor solution and the Apathy Evaluation Scale, Clinician version, resulting in a two-factor solution.
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Extraction method: Principal Components Factor Analysis. Rotation method: varimax with Kaiser normalisation. Converged in 9 iterations for the BIS-11 and 3 iterations for the AES-C; BIS-11 reliability analysis: the alpha coefficients for factor 1 (inattention) were 0.757 and for factor 2 (impetuosity) were 0.807, reflecting very strong internal reliability. The remaining three factors had the following alpha values: factor 3 (personal security), 0.784; factor 4 (planning), 0.719; and factor 5 (future orientation), 0.724. AES-C reliability analysis: the alpha coefficient for factor 1 was 0.907 and 0.841 for factor 2, both reflecting very strong internal reliability. |