Open AccessFunctional Index-3: A Valid and Reliable Functional Outcome Assessment Measure in Patients With Dermatomyositis and Polymyositis
Author(s) -
Floranne C. Ernste,
Christopher A K Y Chong,
Cynthia S. Crowson,
Tanaz A. Kermani,
Orla Ni Mhuircheartaigh,
Helene Alexanderson
Publication year - 2020
Publication title -
the journal of rheumatology/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.