当前位置： SCI文献检索 > JOURNAL OF CLINICAL EPIDEMIOLOGY期刊下所有文献 > Rasch analysis informed modifications to the Work Instability Scale for Rheumatoid Arthritis for use in work-related upper limb disorders.

Rasch analysis informed modifications to the Work Instability Scale for Rheumatoid Arthritis for use in work-related upper limb disorders.

Abstract：

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.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Tang K,Beaton DE,Gignac MA,Bombardier C

doi

10.1016/j.jclinepi.2011.02.002

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

1242-51

issue

11

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(11)00052-7

journal_volume

64

pub_type

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