Table 3.
Reliability and validity of fatigue measures
| Measure | Forum | Subscales | Test-Retest Reliability | Internal Consistency | Construct Validity | Criteron Validity | Time (minutes) | #Items |
|---|---|---|---|---|---|---|---|---|
| FSS | IP/OP Self-report |
NA | 0.91 | 0.94 | 0.80 with Fatigue scale11 | 5 | 9 | |
| MFIS43 | IP/OP | Physical | 0.70–0.86 | NA | 5 to 10 | 9 | ||
| Self-report | Cognitive | 0.77–0.90 | 10 | |||||
| Psychosocial | 0.81 | 2 | ||||||
| Total | 0.94–0.96 | 21 | ||||||
| NFI-MS | IP/OPSelf-report | Physical | 0.85 | NA | 0.96 | 5 to 10 | 16 | |
| Cognitive | 0.82 | 0.85 | 8 | |||||
| Nocturnal Sleep | 0.83 | 0.62 | 7 | |||||
| Diurnal Sleep | 0.79 | 0.65 | 8 | |||||
| Summary | 0.86 | 10 |
FSS = Fatigue Severity Scale; MFIS = Modified Fatigue Inventory Scale; NFI-MS = Neurological Fatigue Index Scale; IP = inpatient; OP = outpatient forum.