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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

  All CFS-like Chronically Unwell Well
General Fatigue     
   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     
   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     
   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     
   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     
   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