Table of Contents
ISRN Rehabilitation
Volume 2013, Article ID 608356, 9 pages
http://dx.doi.org/10.1155/2013/608356
Research Article

Psychometric Evaluation of the Perceived Stress Scale in Multiple Sclerosis

1Group Health Research Institute, 1730 Minor Avenue, Seattle, WA 98101, USA
2Department of Rehabilitation Medicine, University of Washington, P.O. Box 354237, Seattle, WA 98195-4237, USA

Received 23 October 2013; Accepted 2 December 2013

Academic Editors: B. Murphy and C. Zwingmann

Copyright © 2013 Salene M. Wu and Dagmar Amtmann. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Multiple sclerosis (MS) is a progressive disease characterized by neurological symptoms and sometimes heightened levels of distress. The Perceived Stress Scale (PSS) is often used in MS samples to measure stress but has not been validated in this population. Participants ( ) completed the PSS as well as measure of depression, anxiety, and mental and physical health. Factor analyses indicated that the general factor of a bifactor model accounted for a large amount of the variance in the 14-item and 10-item versions of the PSS. The 4-item PSS had two factors, the Stress subscale and the Coping subscale, but a one-factor model also fits the data well. Total scores and both subscales had sufficient reliability and validity for all versions of the PSS, although a few items of the 14-item PSS had low item-total correlations. This study supports the use of the total score of the PSS in MS but also suggests that the 10-item PSS had better psychometric properties than the 14-item PSS.