Table 5 Descriptive statistics for the five MFI-20 scales by subgroups
From: Further validation of the Multidimensional Fatigue Inventory in a US adult population sample
| Â | All | CFS-like | Chronically Unwell | Well |
|---|---|---|---|---|
General Fatigue | Â | Â | Â | Â |
   Mean | 12.90 | 16.38 | 12.84 | 8.42 |
   SD | 4.68 | 2.73 | 3.93 | 3.59 |
   25% | 9.00 | 15.00 | 10.00 | 6.00 |
   Median | 14.00 | 17.00 | 13.00 | 8.00 |
   75% | 17.00 | 18.00 | 16.00 | 11.00 |
   Range | 4-20 | 6-20 | 4-20 | 4-20 |
   % at floor | 3.45 | 0 | 1.49 | 10.31 |
   % at ceiling | 6.13 | 13.01 | 3.36 | 0.45 |
Physical Fatigue | Â | Â | Â | Â |
   Mean | 10.85 | 13.63 | 10.39 | 7.77 |
   SD | 4.36 | 3.79 | 3.76 | 3.36 |
   25% | 7.00 | 11.00 | 8.00 | 5.00 |
   Median | 11.00 | 14.00 | 10.00 | 7.00 |
   75% | 14.00 | 16.00 | 13.00 | 10.00 |
   Range | 4-20 | 4-20 | 4-20 | 4-19 |
   % at floor | 6.39 | 0.34 | 5.60 | 15.25 |
   % at ceiling | 2.81 | 6.51 | 1.12 | 0 |
Reduced Activity | Â | Â | Â | Â |
   Mean | 9.25 | 11.32 | 9.06 | 6.76 |
   SD | 4.16 | 4.37 | 3.75 | 2.67 |
   25% | 6.00 | 8.00 | 6.00 | 5.00 |
   Median | 8.00 | 11.00 | 8.00 | 6.00 |
   75% | 12.00 | 15.00 | 12.00 | 8.00 |
   Range | 4-20 | 4-20 | 4-20 | 4-16 |
   % at floor | 11.49 | 3.77 | 8.96 | 24.66 |
   % at ceiling | 2.43 | 5.14 | 1.49 | 0 |
Reduced Motivation | Â | Â | Â | Â |
   Mean | 9.58 | 11.95 | 9.29 | 6.82 |
   SD | 3.90 | 3.53 | 3.35 | 2.91 |
   25% | 6.00 | 9.50 | 7.00 | 4.00 |
   Median | 9.00 | 12.00 | 9.00 | 6.00 |
   75% | 12.00 | 14.00 | 11.00 | 8.00 |
   Range | 4-20 | 4-20 | 4-20 | 4-20 |
   % at floor | 11.49 | 1.37 | 10.07 | 26.46 |
   % at ceiling | 0.77 | 1.37 | 0.37 | 0.45 |
Mental Fatigue | Â | Â | Â | Â |
   Mean | 10.95 | 13.77 | 10.98 | 7.23 |
   SD | 4.54 | 3.77 | 4.00 | 3.07 |
   25% | 7.00 | 11.50 | 8.00 | 4.00 |
   Median | 11.00 | 14.00 | 11.00 | 7.00 |
   75% | 14.00 | 17.00 | 14.00 | 9.00 |
   Range | 4-20 | 4-20 | 4-20 | 4-20 |
   % at floor | 9.96 | 1.37 | 6.34 | 25.56 |
   % at ceiling | 3.70 | 7.19 | 2.61 | 0.45 |