Comparison of the psychometric properties of two fatigue scales in multiple sclerosis.

Abstract

Researchers and clinicians interested in measuring physical aspects of fatigue in samples whose fatigue ranges from mild to moderate can choose either instrument. For those interested in measuring both physical and cognitive aspects of fatigue, and whose sample is expected to have higher levels of fatigue, the MFIS is a better choice even though it is longer. IRT analyses suggest that both scales could be shortened without a significant loss of precision.