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Cross cultural adaptation and psychometric evaluation of an Arabic version of the modified fatigue impact scale in people with multiple sclerosis

Published:November 29, 2019DOI:https://doi.org/10.1016/j.msard.2019.101878

      Highlights

      • The Arabic Modified Fatigue Impact scale (A-MFIS) has two factors cognitive and physical.
      • The A-MFIS has high concurrent validity with measures of disease severity and quality of life.
      • The A-MFIS subscale and total scores have high test-retest reliability.

      Abstract

      Background

      Fatigue is a common symptom in multiple sclerosis and has significant impacts on participation and quality of life. Thus, fatigue assessment in this population is always a necessity.

      Objectives

      to examine the underlying structure, validity and test-retest reliability of an Arabic translated and culturally adapted version of the Modified Fatigue Impact scale (A-MFIS).

      Methods

      The study was carried out into two phases: firstly, the English version of the MFIS was translated into Arabic and secondly, a detailed analysis of the psychometric properties and the structure of the translated version was conducted using Principle Component Analysis (PCA). Convergent validity was assessed by comparison with measures of disease severity, quality of life and with another measure of fatigue. Test retest reliability was assessed with intra-class correlations.

      Results

      145 subjects participated in the study. The PCA revealed that the instrument has two main factors “cognitive” and “physical”, rather than the original three factors scale. Significant correlations were found between the A-MFIS and measures of disease severity and quality of life (P<0.05). Furthermore, the A-MFIS subscale and total scores have good to high test-retest reliability.

      Conclusion

      The A-MFIS has high reliability and concurrent validity with other measures of disease severity and quality of life.

      Keywords

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