Abstract
Purpose
To derive from the Patient Reported Outcomes Measurement Information System (PROMIS) fatigue item bank, a short form for individuals with multiple sclerosis (MS), the PROMIS-FatigueMS.
Methods
A panel of 37 clinicians and 46 individuals with MS ranked the relevance of PROMIS fatigue items to persons with MS. Eight items were selected for the PROMIS-FatigueMS that maximized relevance rankings, content coverage, and item discrimination. The PROMIS-FatigueMS and an existing, 7-item PROMIS fatigue short form (PROMIS-FatigueSFv1.0) were administered to a new sample of 231 individuals with MS. Known groups and content validity were assessed.
Results
Scores from the short forms were highly correlated (r = 0.92). Discriminant validity of the PROMIS-FatigueMS scores was supported in known groups comparisons. Scores of neither short form exhibited an advantage in quantitative analyses. The PROMIS-FatigueMS targeted more of the content included in participants’ responses to open-ended questions than did the PROMIS-FatigueSFv1.0.
Conclusions
The PROMIS-FatigueMS was derived to have content validity in MS samples. The validity of the measure was further supported by the ability of PROMIS-FatigueMS items to discriminate among groups expected to differ in levels of fatigue. We recommend its use in measuring the fatigue of individuals with MS.
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Abbreviations
- MS:
-
Multiple sclerosis
- PROMIS-Fatigue SFv1.0 :
-
PROMIS 7-item fatigue short form, Version 1.0
- PROMIS:
-
Patient Reported Outcome Measurement Information System
- U.S.:
-
United States
- IRT:
-
Item response theory
- UW:
-
University of Washington, Seattle
- RI:
-
Relevance index
- RI-MS20 :
-
RI value based on participant rankings of 20 PROMIS items
- RI-EX44 :
-
RI value based on expert clinician rankings of 44 PROMIS items
- EDSS:
-
Expanded Disability Status Scores
- SF8:
-
8-item Health Survey Short Form
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Cook, K.F., Bamer, A.M., Roddey, T.S. et al. A PROMIS fatigue short form for use by individuals who have multiple sclerosis. Qual Life Res 21, 1021–1030 (2012). https://doi.org/10.1007/s11136-011-0011-8
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DOI: https://doi.org/10.1007/s11136-011-0011-8