9.91. Multidimensional Fatigue Inventory (MFI-20)


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20 questions rated on a 5-point scale (“yes, that is true” to “no, that is not true”).

Items are scored 1–5, with 10 positively phrased items reverse scored (items 2, 5, 9, 10, 13, 14, 16, 17, 18, 19). Total score calculated for 5 subscales: general fatigue (items 1, 5, 12, 16), physical fatigue (items 2, 8, 14, 20), reduced activity (items 7, 11, 13, 19), reduced motivation (items 3, 6, 10, 17), and mental fatigue (items 4, 9, 15, 18).

9.91.1. Intellectual property rights

  • “The MFI-20 is copyrighted on the names of the authors. The MFI is free for academic use, charges apply for commercial use. For further information, the developers can be contacted.”

9.91.2. History

  • Smets E, Garssen B, Bonke Bd, De Haes J (1995). The Multidimensional Fatigue Inventory (MFI): psychometric qualities of an instrument to assess fatigue. Journal of Psychosomatic Research 39: 315-25. https://www.ncbi.nlm.nih.gov/pubmed/7636775
  • Smets EM, Garssen B, Cull A, de Haes JC (1996). Application of the multidimensional fatigue inventory (MFI-20) in cancer patients receiving radiotherapy. Br J Cancer 73: 241-5. https://www.ncbi.nlm.nih.gov/pubmed/8546913