Measuring the Functional Impact of Fatigue: Initial Validation of the Fatigue Impact Scale

The fatigue impact scale (FIS) was developed to improve our understanding of the effects of fatigue on quality of life. The FIS examines patients' perceptions of the functional limitations that fatigue has caused over the past month. FIS items reflect perceived impact on cognitive, physical, an...

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Bibliographic Details
Published in:Clinical infectious diseases 1994-01, Vol.18 (Supplement-1), p.S79-S83
Main Authors: Fisk, John D., Ritvo, Paul G., Ross, Lynn, Haase, David A., Marrie, Thomas J., Schlech, Walter F.
Format: Article
Language:English
Subjects:
Adult
Bed rest
Biological and medical sciences
Chronic diseases
Cognition Disorders - physiopathology
Discriminants
Diseases of striated muscles. Neuromuscular diseases
Fatigue
Fatigue Syndrome, Chronic - diagnosis
Fatigue Syndrome, Chronic - physiopathology
Fatigue Syndrome, Chronic - psychology
Female
Health status
Humans
Hypertension
Hypertension - physiopathology
Hypertension - psychology
Interpersonal Relations
Male
Medical sciences
Multidisciplinary Studies
Multiple sclerosis
Multiple Sclerosis - physiopathology
Multiple Sclerosis - psychology
Neurology
Psychometrics
Quality of Life
Self Concept
Symptoms
Citations: Items that cite this one
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Summary:The fatigue impact scale (FIS) was developed to improve our understanding of the effects of fatigue on quality of life. The FIS examines patients' perceptions of the functional limitations that fatigue has caused over the past month. FIS items reflect perceived impact on cognitive, physical, and psychosocial functioning. This study compared 145 patients referred for investigation of chronic fatigue (ChF) with 105 patients with multiple sclerosis (MS) and 34 patients with mild hypertension (HT). Internal consistency for the FIS and its three subscales was >.87 for all analyses. Fatigue impact was highest for the ChF group although the MS group's reported fatigue also exceeded that of the HT group. Discriminant function analysis correctly classified 80.0% of the ChF group and 78.1% of the MS group when these groups were compared. This initial validation study indicates that the FIS has considerable merit as a measure of patients' attribution of functional limitations to symptoms of fatigue.
ISSN:1058-4838
1537-6591
DOI:10.1093/clinids/18.Supplement_1.S79