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A PROMIS fatigue short form for use by individuals who have multiple sclerosis

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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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Authors

Corresponding author

Correspondence to Karon F. Cook.

Appendices

Appendix 1

See Table 5.

Table 5 Fatigue item variable name, content, relevance indices, and short form membership (denoted with an ‘x’)

Appendix 2

See Table 6.

Table 6 PROMIS-FatigueMS Raw score (Sum of All Item Scores) and their equivalent T-scores

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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

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