EVALUATION OF A SWEDISH VERSION OF THE ARTHRITIS SELF-EFFICACY SCALE IN PEOPLE WITH FIBROMYALGIA

The major purpose of this study was to determine thr utility and const ruct validity of the Swedish version of the Arthritis Self-Efficacy Sc ale (ASES-S). Ninetynine women with fibromyalgia (FS) were included in a randomized, controlled trial of fibromyalgia efficacy-based self-ma nagement education and physical training. Several self-report instrume nts were used to evaluate the outcome of the intervention. Evidence of construct validity of the ASES-S was revealed in the factor analysis which produced a three factor solution similar to previous results. Si gnificant correlations between ASES-S and pre and post health status m easures were consistent with theoretically derived hypotheses, further testifying to construct validity. Multiple regression analyses confir med that pretest ASES-S was the strongest predictor of posttest ASES-S . The results indicated that the intervention had produced a significa nt change in ASES-S and that this positive change in self-efficacy was associated with changes in health status. In conclusion, this study h as shown the ASES-S to be a valid measure of treatment effects also fo r patients with FS.