Psychometric Properties of the Persian Version of the Fatigue Impact Scale (FIS-P) in Patients with Multiple Sclerosis

Objectives: This study was designed to evaluate the psychometric features of the Persian version of the Fatigue Impact Scale (FIS-P) tool when used in Iranian MS patients. Methods: ۱۴۰ MS patients and the equivalent number of healthy controls completed the following assessments: FIS-P, Fatigue Severity Scale (FSS), SF-۳۶ questionnaire and  the Mini-Mental State Examination (MMSE).  Results: A significant inverse correlation between FIS and the quality of life (SF-۳۶ assessment tool), as well as a positive and significant correlation with the FSS were noted. The Intraclass Correlation Coefficient (ICC) values for the inter-rater reliability for the physical, cognitive, and social sections and the whole questionnaire were ۰.۸۹, ۰.۸۶, ۰.۹۵ and ۰.۹۸, respectively. The FIS Persian version was shown to possess a high reliability (with a Cronbach’s alpha  of ۰.۹۵۳). Likewise, the ICC values for the test-retest reliability were ۰.۸۶, ۰.۸۷, ۰.۹۲ and ۰.۹۳ for the physical, cognitive, social subscales and the whole questionnaire, respectively. This suggested a high reliability for the FIS-P. Discussion: With a proper validity and reliability, the Persian-version of FIS retains the capability for being used in the assessment of fatigue and evaluation of the treatment and rehabilitation effects on fatigue-related symptoms among Persian-speaking patients with MS.

کلیدواژه ها:

Multiple sclerosis ، Fatigue ، Fatigue impact scale ، Psychometric ، Persian