Reliability and validity of PROMIS physical function, pain interference, and fatigue as patient reported outcome measures in adult idiopathic inflammatory myopathies: International study from the OMERACT myositis working group

DiRenzo, D; Saygin, D; de Groot, I; Bingham Iii, CO; Lundberg, IE; Needham, M; Park, JK; Regardt, M; Sarver, C; Song, YW; Maxwell, L; Beaton, D; de Visser, M; Christopher-Stine, L; Mecoli, CA; Alexanderson, H

doi:10.1016/j.semarthrit.2022.152111

Inflammatory myopathies

Reliability and validity of Patient Reported Outcome Information System (PROMIS) physical function, pain interference, and fatigue as patient reported outcome measures in adult idiopathic inflammatory myopathies: International study from the OMERACT myositis working group

Semin Arthritis RheumPublished 3 Nov 2022Psychometric validation study

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Authors' conclusion

This study presents test-retest reliability and construct validity evidence supporting PROMIS Pain Interference (6a v1.0), Fatigue (7a v1.0), and Physical Function (8b v2.0) using a large international cohort of patients with IIM. Internal consistency of these instruments was excellent. A ceiling effect was noted in the Pain Interference instrument.

Study context

Population: Adult idiopathic inflammatory myopathies (IIM) patients from OMERACT Myositis Working Group international clinic sitessurveys sent
Participants: 368 patients

Comparison: PROMIS Pain Interference 6av1.0 vs PROMIS Fatigue 7av1.0 vs PROMIS Physical Function 8bv2.0
Outcome: Construct validity (Pearson correlations vs a priori hypotheses) and test-retest reliability (intraclass correlation coefficient) of PROMIS instruments
Follow-up: Time zero and 7 days

Methodological detailsinternational, multicentre, online surveys (2019, 2021), a priori hypotheses (>75% Myositis Working Group (MWG) agreement)

International
Multicentre
Online surveys (2019, 2021)
A priori hypotheses (>75% MWG agreement)

Performance

As reported in the abstract

Construct validity: a priori hypotheses met

A priori hypotheses met, all PROMIS instruments

10 out of 13

Pain Interference hypotheses met

3 of 4

Fatigue hypotheses met

4 of 4

Physical Function hypotheses met

3 of 5

Further findings

Internal consistency (Cronbach's α)

Excellent internal consistency for all PROMIS instruments

Ceiling and floor effects

No ceiling or floor effects except a ceiling effect in Pain Interference

Original publication

Reliability and validity of PROMIS physical function, pain interference, and fatigue as patient reported outcome measures in adult idiopathic inflammatory myopathies: International study from the OMERACT myositis working group. Semin Arthritis Rheum. Published 3 November 2022. doi:10.1016/j.semarthrit.2022.152111

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