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Abstract

The fatigue impact scale (FIS) was developed previously as a symptom-specific profile measure of health-related quality of life (HRQoL) for use in medical conditions in which fatigue is a prominent chronic symptom. Thus, it was not developed to be a responsive measure of daily changes in fatigue. This study describes the development and initial validation of an adaptation of the FIS for daily use. Items for the daily fatigue impact scale (D-FIS) were selected from the pool of original FIS items through Rasch analyses of existing data. The reduced-item FIS was administered to a sample of 93 subjects with flu-like illness, 25 of whom were followed for a 21-day period. Rasch analyses were used to further reduce the scale to a minimum number of items that represented a unidimensional measure of self-reported fatigue impact. This 8-item D-FIS demonstrated good relations to flu symptom ratings and to other general health ratings. It also proved to be a responsive measure of change in reported fatigue impact for subjects who were followed longitudinally. This initial validation study indicates that the D-FIS has considerable promise as a valid measure of the subjective daily experience of fatigue.

Comorbidities Are Associated with Altered Health Services Use in Multiple Sclerosis: A Prospective Cohort Study

“…Persons were categorized as having 0, 1, 2, or 3+ comorbidities [16]. The 8-item Daily Fatigue Impact Scale captured current symptoms of fatigue and was dichotomized as “no vs. any fatigue” (< 5 vs. ≥5) [17]. The Health Utilities Index (Mark III version) is a multi-attribute interval measure of health-related quality of life (HRQoL), previously validated for use in MS [18], which uses patient-reported health states based on vision, hearing, speech, mobility, dexterity, emotion, cognition, and pain.…”

Determinants of non-adherence to disease-modifying therapies in multiple sclerosis: A cross-Canada prospective study

“…Fatigue was measured using the Daily Fatigue Impact Scale, an 8-item scale, dichotomized as “no fatigue” (<5) and “any fatigue” (⩽5). 23 Health-related quality of life (HRQOL) was measured using the Health Utilities Index Mark III version (HUI-3), 24,25 a 15-item measure that assesses health state with respect to eight single-attribute scores: vision, hearing, speech, mobility, dexterity, emotion, cognition, and pain. These single attribute scores were combined into an overall score which can range from 0 (equivalent to death) to 1 (perfect health), which was categorized as “no to moderate disability” (>0.70) and “severe disability” (⩾0.70).…”

Physical Activity Levels at Work and Outside of Work Among Commercial Construction Workers

“…Because of fatigue, I felt less alert). 28 Each of the eight items was rated on a Likert-type scale, with 1=never and 5=very often. Scores were summed to attain a total ranging from 8 to 40, with an increasing level of fatigue.…”