Properties of the Apathy Scale (AS) for use on Parkinson’s patients - Advances in Parkinson's Disease

APD > Vol.2 No.2, May 2013

Properties of the Apathy Scale (AS) for use on Parkinson’s patients ()

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DOI: 10.4236/apd.2013.22010 12,434 Downloads 33,011 Views Citations

Author(s)

Marcos Serrano-Dueñas, Pablo Martínez-Martín, Tamara Merchán, Rosaura Bravo, Maite Serrano

Affiliation(s)

Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health, Alzheimer Center Reina Sofia Foundation, Madrid, Spain.
Medicine Faculty, Pontifical Catholic University of Ecuador, Quito, Ecuador.
Movement Disorder and Biostatistics Units, Neurological Service, Carlos Andrade Marín Hospital, Quito, Ecuador; Medicine Faculty, Pontifical Catholic University of Ecuador, Quito, Ecuador.

ABSTRACT

Parkinson’s disease is a neurodegenerative disorder characterized by motor, autonomic, and neuropsychiatric symptoms, among the latter, apathy has been found to be present in up to 70% of patients. The main objective of the present study was to assess the psychometric properties of the Apathy Scale for evaluation of Ecuadorian patients with Parkinson’s. This was a cross sectional study, with re-test. There were 73 women (34.5%) in the final sample of 211 patients. Mean age was 67.5 ± 10.2 years, mean length of illness was 7.1 ± 5.5 years, and the mean ldopa dose was 656.1 ± 292.7 mg/day. The mean Apathy Scale score was 12.7 ± 7.1. Reliability: The Guttman’s λ obtained was 0.89. The SEM was 2.34 for the AS. The ICC using an absolute agreement definition was: ICC = 0.78 [(95% IC 0.73 - 0.82) f = 4.96; p ≤ 0.000]. Discriminative validity, analyzed with the Kruskal-Wallis statistic and using H&Y stages as segmentation variable registered an X(2) value of p < 0.0001. In conclusion the Apathy Scale proved to have suitable metric attributes in this specific PD patient sample: internal consistency, reliability, stability, and convergent and known-groups validity.

KEYWORDS

Parkinson’s Disease; Apathy Associated with Parkinson’s Disease; Apathy Scale; Metric Properties

Share and Cite:

Serrano-Dueñas, M. , Martínez-Martín, P. , Merchán, T. , Bravo, R. and Serrano, M. (2013) Properties of the Apathy Scale (AS) for use on Parkinson’s patients. Advances in Parkinson's Disease, 2, 53-57. doi: 10.4236/apd.2013.22010.

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