Document Detail


Rasch analysis informed modifications to the Work Instability Scale for Rheumatoid Arthritis for use in work-related upper limb disorders.
MedLine Citation:
PMID:  21530170     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: The Work Instability Scale for Rheumatoid Arthritis (RA-WIS) is a promising prognostic tool for future work disability outcomes. Rasch analysis was conducted to examine the psychometric performance of the RA-WIS in work-related upper limb disorders. STUDY DESIGN AND SETTING: Eligible injured workers (n=396) attending a Shoulder and Elbow Specialty clinic participated in a 1-year study with surveys fielded at four time points. Fit of RA-WIS data (range, 0-23 with 23=highest work instability) to the Guttman structure was evaluated by item-fit, person-fit, item-trait interaction statistics, and the person separation index (PSI). Differential item functioning (DIF) was evaluated by two-way analyses of variance of the residuals across age, sex, location of injury, perceived exertion at work, and repeated testing over time. Unidimensionality was evaluated by principal component analysis of residuals and tests of local independence. RESULTS: RA-WIS data showed significant deviations from the Guttman structure (item-trait interaction χ(2)=181.6, P<0.0001, PSI=0.86). A sequential removal of the six most misfitting items was performed, resulting in a 17-item scale that met all Rasch model expectations (χ(2)=57.5, P=0.007, PSI=0.83), including unidimensionality, local independence of items, and the absence of DIF across all tested factors. CONCLUSION: A new 17-item Upper Limb Work Instability Scale that satisfied assumptions for interval-level scaling was derived.
Authors:
Kenneth Tang; Dorcas E Beaton; Monique A M Gignac; Claire Bombardier
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-27
Journal Detail:
Title:  Journal of clinical epidemiology     Volume:  -     ISSN:  1878-5921     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-5-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8801383     Medline TA:  J Clin Epidemiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Department of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada M5T 3M6; Mobility Program Clinical Research Unit, from the Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada M5B 1W8; Institute for Work & Health, Toronto, Ontario, Canada M5G 2E9.
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