Table 3 MFI-20 scale item characteristics and internal consistency reliabilities.
From: Further validation of the Multidimensional Fatigue Inventory in a US adult population sample
|  |  |  | Inter-item correlation | Corrected-to-total correlation | Coefficient α if item deleted | Standardized Cronbach's |
|---|---|---|---|---|---|---|
|  | Mean | SD | Mean (Range) | Range | Range | α |
General Fatigue | 12.90 | 4.68 | 0.56 (0.46-0.69) | 0.59-0.70 | 0.77-0.84 | 0.83 |
Physical Fatigue | 10.85 | 4.36 | 0.52 (0.44-0.61) | 0.59-0.67 | 0.75-0.79 | 0.81 |
Reduced Activity | 9.25 | 4.16 | 0.53 (0.41-0.66) | 0.51-0.71 | 0.75-0.84 | 0.82 |
Reduced Motivation | 9.58 | 3.90 | 0.38 (0.17-0.56) | 0.33-0.62 | 0.57-0.75 | 0.71 |
Mental Fatigue | 10.95 | 4.54 | 0.61 (0.53-0.66) | 0.68-0.75 | 0.81-0.84 | 0.86 |
Total Fatigue Score | 53.53 | 17.93 | 0.40 (0.11-0.68) | 0.33-0.77 | 0.92-0.93 | 0.93 |