Psychometric properties of the Polish version of the Multiple Sclerosis Self-Management Scale - Revised

Purpose The main aim of this study was to analyse the psychometric properties of the Polish version of the Multiple Sclerosis Self-Management-Revised Scale. Methods A total of 663 patients with multiple sclerosis were included in this study. The Polish version of the Multiple Sclerosis Self-Management-Revised Scale, The General Self-Efficacy Scale, Multiple Sclerosis Impact Scale-29, and Expanded Disability Status Scale were used. Cronbach's alpha and McDonald's omega coefficients were calculated to assess the Polish version of the scale's reliability. The reliability of the scale's test items was assessed using an information function with the multidimensional graded response model. Confirmatory factor and principal component analyses were conducted. Results Cronbach's alpha and McDonald's omega were obtained (alpha = 0.896, omega = 0.909). Correlations between the scores of the Polish version of the Multiple Sclerosis Self-Management-Revised Scale and the General Self-Efficacy Scale (r = 0.34;p < 0.001) and the neurological assessment of patients by a physician (r = -0.23;p < 0.001) were significant. The original factor structure of the scale was not confirmed (Chi2(242) = 1480;p< .001; CFI = 0.829; TLI = .805; RMSEA = 0.088, 90% CI = [0.084-0.092]; SRMR = 0.079). Conclusions Using only the total score of the Multiple Sclerosis Self-Management-Revised Scale is recommended for Polish patients. The scale's factor structure requires further study.