Outcome Measure
Fatigue Assessment Scale
What it measures?
- The FAS full-scale assesses symptoms of physical and mental fatigue.
- It is possible to calculate Physical fatigue and a Mental fatigue subscales, each containing 5 items (De Vries, Michielsen, Van Heck & Drent, 2004). However, factor-analytic studies support a unidimensional structure, and so we have chosen not to calculate them.
Who is it for?
Adults aged 18 years and older.
Instrument Quality
- The FASD has been validated in studies examining at least 26 different diseases or conditions, including stroke, neurologic disorders, rheumatoid arthritis, idiopathic pulmonary fibrosis and sarcoidosis, and demonstrates good reliability and validity (Hendriks, Drent, Elfferich & De Vries, 2018). A unidimensional factor structure is supported in both normative and clinical samples (Michielson et al., 2003; Michielson et al., 2004).
Structure
- 10 items
- 5-point Likert scale
- Respondents are asked how often (1 = “Never”; 5 = “Always”) they usually experience each statement (e.g. “Mentally, I feel exhausted”)
Scoring instructions
Sum all item responses to derive the full-scale score.
| Subscale | Item number |
|---|---|
Full-scale (FAS) |
1,2,3,4,5,6,7,8,9,10 |
Score Interpretation
What higher scores mean?
- More severe symptoms of mental and/or physical fatigue.
How to assess symptom severity & change?
| Description | Score Range | |
|---|---|---|
| No fatigue | 10 | |
| Mild-to-moderate fatigue | 22 | |
| Severe fatigue | 35 | |
| Maximum | 50 |
Instrument developers
- Michielsen, H. J., De Vries, J., & Van Heck, G. L. (2003). Psychometric qualities of a brief self-rated fatigue measure: The Fatigue Assessment Scale. Journal of psychosomatic research, 54(4), 345-352
Refrences
* de Kleijn, W. P., De Vries, J., Wijnen, P. A., & Drent, M. (2011). Minimal (clinically) important differences for the Fatigue Assessment Scale in sarcoidosis. Respiratory medicine, 105(9), 1388-1395. * De Vries, J., Michielsen, H., Van Heck, G. L., & Drent, M. (2004). Measuring fatigue in sarcoidosis: the Fatigue Assessment Scale (FAS). British journal of health psychology, 9(3), 279-291 * De Vries, J., Van der Steeg, A. F., & Roukema, J. A. (2010). Psychometric properties of the Fatigue Assessment Scale (FAS) in women with breast problems. International Journal of Clinical and Health Psychology, 10(1), 125-139. * Hendriks, C., Drent, M., Elfferich, M., & De Vries, J. (2018). The Fatigue Assessment Scale: quality and availability in sarcoidosis and other diseases. Current opinion in pulmonary medicine, 24(5), 495-503. * Hinz, A., Fleischer, M., Brähler, E., Wirtz, H., & Bosse-Henck, A. (2011). Fatigue in patients with sarcoidosis, compared with the general population. General hospital psychiatry, 33(5), 462-468 * Horisberger, A., Courvoisier, D., & Ribi, C. (2019). The Fatigue Assessment Scale as a simple and reliable tool in systemic lupus erythematosus: a cross-sectional study. Arthritis research & therapy, 21, 1-8. * Michielsen, H. J., De Vries, J., & Van Heck, G. L. (2003). Psychometric qualities of a brief self-rated fatigue measure: The Fatigue Assessment Scale. Journal of psychosomatic research, 54(4), 345-352. * Michielsen, H. J., Drent, M., Peros-Golubicic, T., & De Vries, J. (2006). Fatigue is associated with quality of life in sarcoidosis patients. Chest, 130(4), 989-994
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Severity ranges
Severity ranges were reported by Hendriks, Drent, Elfferich and De Vries (2018), who conducted a review of the FAS for use with patients experiencing sarcoidosis and other diseases.
Reliable change and clinically significant improvement
De Kleign, De Vries, Wijnen and Drent (2011) examined the Minimal Clinically Important Difference (MCID) score on the FAS in a sample of patients experiencing sarcoidosis. Using anchor-based and distribution-based methods, the authors reported that the Standard Error of Measurement (SEM) was 3.6 points, and the MCID was a 4-points.
Mean
Standard Deviation
Reliability