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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