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Measuring the functional impact of fatigue: initial validation of the fatigue impact scale

  [ 20 votes ]   [ Discuss This Article ] • January 3, 1994

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 patient's attribution of
functional limitations to symptoms of fatigue.

Fisk JD, Ritvo PG, Ross L, Haase DA, Marrie TJ, Schlech WF

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