The FSS was originally developed for use among individuals with Multiple Sclerosis (Krupp 1989). It captures the individual’s experience of mental or psychological fatigue and how it interferes with performing certain activities (exercise, work and family life).
Number of items: 9
Procedure/Administration: Self report scale. Participants choose the level of agreement for each question, from 1 = strongly disagree to 7 = strongly agree. Ratings are based on their experience of fatigue over the past seven days.
How scored: A total score is represented by the mean of all the answered items (adding up all the answers and dividing by nine).
Interpretability: Scores range from 1-7 with higher scores indicating higher levels of fatigue. Scores of 4 and over are indicative of significant fatigue in other populations.
Acceptability: Some of the items may not be reflective of the
Time to administer: 5 minutes
Time to score: Quickly scored
Training required: N/a
Availability: A copy of the tool can be obtained at http://www.mult-sclerosis.org/fatigueseverityscale.html.
Equipment required: None
IC: Green light
TR: Green light
Construct: Yellow light
AUC: Yellow light
SS: Yellow light
Note: TR= Test re-test; IC= Internal Consistency; Inter-O= Inter-observer; Intra-O= Intra-observer; SS= Sensitivity/Specificity; AUC= Area under ROC curve; N/a= No information.
Red light= A single study involving SCI subjects which has less than adequate findings of reliability, validity, and/or responsiveness.
Yellow light= A single study involving subjects with SCI which has adequate to excellent findings of reliability, validity, and/or responsiveness.
Green light= At least 2 studies involving subjects with SCI which have adequate to excellent findings of reliability, validity, and/or responsiveness.