Modified Fatigue Impact Scale (MFIS)
Measures the perceived impact of fatigue on physical, cognitive, and psychosocial functioning.
Scale Development & Technical Details
Scale Overview
The Modified Fatigue Impact Scale (MFIS) was developed by Fisk JD, et al. (FIS); Panel of the Multiple Sclerosis Council for Clinical Practice Guidelines (MFIS) (1998). It is designed to measure Fatigue Impact. The scale is intended for use with Adults and elderly, particularly those with Multiple Sclerosis, ALS, or other neurological conditions.
Scale Structure
This instrument consists of 21 items organized into 3 factors/subscales: Physical, Cognitive, Psychosocial.
| Factor / Subscale | Items | N |
|---|---|---|
| Physical | 4,6,7,10,13,14,19,20,21 | 9 |
| Cognitive | 1,2,3,5,11,12,15,16,17,18 | 10 |
| Psychosocial | 8,9 | 2 |
Response Format
Respondents rate each item using a custom response format.
Response anchors: 0 = Never, 1 = Rarely, 2 = Sometimes, 3 = Often, 4 = Almost always.
Scoring
Items are scored by subscale, with each subscale sum representing a distinct dimension.
Total scores range from 0 to 84. Interpretation guidelines:
- Low fatigue impact: 0 – 37
- Significant fatigue impact: 38 – 84
Psychometric Properties
Internal Consistency: The scale has demonstrated good to excellent internal consistency with reported Cronbach’s alpha values of High internal consistency (Cronbach's alpha typically > 0.80).
Administration
The scale is self-administered and typically takes approximately 5 minutes to complete. It can be administered individually or in group settings. No special training is required for administration.