Functional Index-3: A Valid and Reliable Functional Outcome Assessment Measure in Patients With Dermatomyositis and Polymyositis | Zendy

Floranne C. Ernste | Zendy; Christopher Chong | Zendy; Cynthia S. Crowson | Zendy; Tanaz A. Kermani | Zendy; Orla Ni Mhuircheartaigh | Zendy; Helene Alexanderson | Zendy

Open Access

Functional Index-3: A Valid and Reliable Functional Outcome Assessment Measure in Patients With Dermatomyositis and Polymyositis

Author(s) -

Floranne C. Ernste,

Christopher Chong,

Cynthia S. Crowson,

Tanaz A. Kermani,

Orla Ni Mhuircheartaigh,

Helene Alexanderson

Publication year - 2020

Publication title -

the journal of rheumatology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.577

H-Index - 178

eISSN - 1499-2752

pISSN - 0315-162X

DOI - 10.3899/jrheum.191374

Subject(s) - intraclass correlation , medicine , construct validity , dermatomyositis , inter rater reliability , physical therapy , polymyositis , intra rater reliability , rheumatology , correlation , reliability (semiconductor) , physical medicine and rehabilitation , rank correlation , spearman's rank correlation coefficient , psychometrics , confidence interval , statistics , rating scale , mathematics , quantum mechanics , clinical psychology , power (physics) , geometry , physics

Patients with dermatomyositis (DM) and polymyositis (PM) have reduced muscle endurance.The aim of this study was to streamline the Functional Index-2 (FI-2) by developing the Functional Index-3 (FI-3) and to evaluate its measurement properties, content and construct validity, and intra- and interrater reliability.

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