The Unidimensional Fatigue Impact Scale (U-FIS) is a disease-specific patient-reported outcome measure which measures the impact of multiple sclerosis related fatigue. [1] It is a 22-item unidimensional scale which is based on needs-based quality of life theory. [1]
The U-FIS was developed by Galen Research and published in 2009. [1] It was derived from the Fatigue Impact Scale, a scale identified by the Multiple Sclerosis Council for Clinical Practice Guidelines “as the most appropriate for assessing the impact of MS-related fatigue on quality of life”. [2]
Data from the FIS went through Rasch analysis and additional items were added from interviews with multiple sclerosis patients. The U-FIS was then tested for validity via patient interviews and a validation survey. [1]
The U-FIS has been translated and validated into eight different language versions: Canadian English, Canadian French, German, Swedish, Italian, French, US English and Spanish. [3]
It has been recommended for use in determining fatigue impact by an independent meta analysis [4] and has also been utilized in a study investigating the role of neuroticism, perfectionism and depression in chronic fatigue syndrome. [5]
The Unidimensional Fatigue Impact Scale (U-FIS) is a disease-specific patient-reported outcome measure which measures the impact of multiple sclerosis related fatigue. [1] It is a 22-item unidimensional scale which is based on needs-based quality of life theory. [1]
The U-FIS was developed by Galen Research and published in 2009. [1] It was derived from the Fatigue Impact Scale, a scale identified by the Multiple Sclerosis Council for Clinical Practice Guidelines “as the most appropriate for assessing the impact of MS-related fatigue on quality of life”. [2]
Data from the FIS went through Rasch analysis and additional items were added from interviews with multiple sclerosis patients. The U-FIS was then tested for validity via patient interviews and a validation survey. [1]
The U-FIS has been translated and validated into eight different language versions: Canadian English, Canadian French, German, Swedish, Italian, French, US English and Spanish. [3]
It has been recommended for use in determining fatigue impact by an independent meta analysis [4] and has also been utilized in a study investigating the role of neuroticism, perfectionism and depression in chronic fatigue syndrome. [5]