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dc.contributor.authorGladman, Dafna
dc.contributor.authorNash, Peter
dc.contributor.authorGoto, Hitoshi
dc.contributor.authorBirt, Julie A
dc.contributor.authorLin, Chen-Yen
dc.contributor.authorOrbai, Ana-Maria
dc.contributor.authorKvien, Tore K
dc.date.accessioned2020-07-20T04:36:29Z
dc.date.available2020-07-20T04:36:29Z
dc.date.issued2020
dc.identifier.issn2056-5933
dc.identifier.doi10.1136/rmdopen-2019-000928
dc.identifier.urihttp://hdl.handle.net/10072/395639
dc.description.abstractObjectives This study assessed the psychometric properties of the fatigue numeric rating scale (NRS) and sought to establish values for clinically meaningful change (responder definition). Methods Using disease-specific clinician-reported and patient-reported data from two randomised clinical trials of patients with psoriatic arthritis (PsA), the fatigue NRS was evaluated for test-retest reliability, construct validity and responsiveness. A responder definition was also explored using anchor-based and distribution-based methods. Results Test-retest reliability analyses supported the reproducibility of the fatigue NRS in patients with PsA (intraclass correlation coefficient=0.829). Mean (SD) values at baseline and week 2 were 5.7 (2.2) and 5.7 (2.4), respectively. Supporting construct validity of the fatigue NRS, moderate-to-large correlations with other assessments measuring similar concepts as measured by Sackett's conventions were demonstrated. Fatigue severity was reduced when the underlying disease activity was improved and reductions remained consistent at week 12 and 24. A 3-point improvement was identified as being optimal for demonstrating a level of clinically meaningful improvement in fatigue NRS after 12-24 weeks of treatment. Conclusions Fatigue NRS is a valid and responsive patient-reported outcome instrument for use in patients with PsA. The established psychometric properties from this study support the use of fatigue NRS in clinical trials and in routine clinical practice. Robust validation of reliability for use in routine clinical practice in treating patients with active PsA in less active disease states and other more diverse ethnic groups is needed.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherBMJ Publishing Group
dc.relation.ispartofpagefrome000928:1
dc.relation.ispartofpagetoe000928:8
dc.relation.ispartofissue1
dc.relation.ispartofjournalRMD Open
dc.relation.ispartofvolume6
dc.subject.fieldofresearchClinical Sciences
dc.subject.fieldofresearchcode1103
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsRheumatology
dc.subject.keywordsHEALTH-ASSESSMENT QUESTIONNAIRE
dc.subject.keywordsDISEASE-ACTIVITY
dc.titleFatigue numeric rating scale validity, discrimination and responder definition in patients with psoriatic arthritis
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationGladman, D; Nash, P; Goto, H; Birt, JA; Lin, C-Y; Orbai, A-M; Kvien, TK, Fatigue numeric rating scale validity, discrimination and responder definition in patients with psoriatic arthritis, RMD Open, 2020, 6 (1), pp. e000928:1-e000928:8
dcterms.dateAccepted2019-10-22
dcterms.licensehttps://creativecommons.org/licenses/by-nc/4.0/
dc.date.updated2020-07-20T04:33:11Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© Author(s) (or their employer(s)) 2020. This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
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gro.griffith.authorNash, Peter


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