Validation of the Russian version of the Fatigue Impact Scale and Fatigue Severity Scale in multiple sclerosis patients.

Background: Fatigue is a common complaint in patients with multiple sclerosis (MS), and its detection and monitoring are based on self-reported questionnaires. The objective of this study was to validate the Russian translation of the Fatigue Impact Scale (FIS) and the Fatigue Severity Scale (FSS) in MS patients and controls.

Methods: We included 85 MS patients and 250 age-, sex-, and body mass index (BMI)-matched controls.