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Investigation of the psychometric properties of the Inclusion Body Myositis Functional Rating Scale using Rasch analysis

Ramdharry, G; Morrow, J; Hudgens, S; Skorupinska, I; Gwathmey, K; Currence, M; Herbelin, L; ... Sadjadi, R; + view all (2019) Investigation of the psychometric properties of the Inclusion Body Myositis Functional Rating Scale using Rasch analysis. Muscle & Nerve , 60 (2) pp. 161-168. 10.1002/mus.26521. Green open access

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Abstract

INTRODUCTION: The IBMRFS is a 10 item clinician rated ordinal scale developed for people with inclusion body myositis. METHODS: Single observations of the IBMFRS were collected from 132 patients. Following Rasch analysis, modifications were made to the scale to optimise fit to the Rasch model, while maintaining clinical validity and utility. RESULTS: The original IBMFRS did not fit the assumptions of the Rasch model due to multidimensionality of the scale. Items demonstrated local dependence, disordered step thresholds, and differential item functioning. Deconstructing the scale into upper limb (IBMFRS-UL) and lower limb (IBMFRS-LL) scales improved fit to the Rasch model. A 9 item scale, with the swallowing item removed, (IBMFRS-9) remained multidimensional but demonstrated the ability to discriminate patients along the severity continuum. IBMFRS-UL, IBMFRS-LL and IBMFRS-9 scores were transformed to a 0-100 scale for comparability. DISCUSSION: This analysis has led to the development of three optimised versions of the IBMFRS. This article is protected by copyright. All rights reserved.

Type: Article
Title: Investigation of the psychometric properties of the Inclusion Body Myositis Functional Rating Scale using Rasch analysis
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/mus.26521
Publisher version: https://doi.org/10.1002/mus.26521
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. - Correction issued 20 August 2019 (see https://doi.org/10.1002/mus.26661).
Keywords: Inclusion Body Myositis, Rasch analysis, outcome measurement
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Department of Neuromuscular Diseases
URI: https://discovery.ucl.ac.uk/id/eprint/10075427
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