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Titolo:
A new look at the Western Ontario and McMaster Universities OsteoarthritisIndex using Rasch analysis
Autore:
Ryser, L; Wright, BD; Aeschlimann, A; Mariacher-Gehler, S; Stucki, G;
Indirizzi:
Univ Zurich Hosp, Clin Rheumatol, CH-8091 Zurich, Switzerland Univ Zurich Hosp Zurich Switzerland CH-8091 CH-8091 Zurich, Switzerland Univ Zurich Hosp, Inst Med Phys, CH-8091 Zurich, Switzerland Univ Zurich Hosp Zurich Switzerland CH-8091 CH-8091 Zurich, Switzerland Univ Chicago, MESA Psychometr Lab, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 A Psychometr Lab, Chicago, IL 60637 USA Zurzach Rheumatol & Rehabil Clin, Zurzach, Switzerland Zurzach Rheumatol &Rehabil Clin Zurzach Switzerland rzach, Switzerland
Titolo Testata:
ARTHRITIS CARE AND RESEARCH
fascicolo: 5, volume: 12, anno: 1999,
pagine: 331 - 335
SICI:
0893-7524(199910)12:5<331:ANLATW>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
WOMAC; KNEE; HIP; INSTRUMENT; OUTCOMES; INTERVAL; SCALES;
Keywords:
Western Ontario and McMaster Universities; Osteoarthritis Index; Rasch analysis; osteoarthritis; health status instrument;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Ryser, L Univ Zurich Hosp, Clin Rheumatol, Gloriastr 25, CH-8091 Zurich, Switzerland Univ Zurich Hosp Gloriastr 25 Zurich Switzerland CH-8091 zerland
Citazione:
L. Ryser et al., "A new look at the Western Ontario and McMaster Universities OsteoarthritisIndex using Rasch analysis", ARTH C RES, 12(5), 1999, pp. 331-335

Abstract

Objective. The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a valid and widely used instrument for the assessment of osteoarthritis patients. We examined whether applying Rasch analysis, a new item-response theory, supports its metric properties. Methods. The metric properties were examined in a cohort of patients with osteoarthritis of the hip or knee. In an exploratory approach, a validated German version of the WOMAC was analyzed using Rasch analysis for its unidimensionality and construct definition. Results. One hundred fifty-eight patients were included in the study. The 3 WOMAC domains-pain, stiffness, and physical function-were unidimensional when examined separately. In an analysis including all items, the stiffnessitems did not fit the model. This indicates that they are distinct from the pain and function items. Item difficulty analyses revealed redundancy between corresponding pain and function items addressing the same task (e.g., "pain while standing upright" and "difficulty while standing"). Conclusion. Applying Rasch analysis to the 3 WOMAC domains confirms their unidimensionality. However, the pain and function items seem to represent the same construct. Thus, if may be possible to simplify these domains to avoid redundancy The impact of reducing items must nevertheless be examined.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 17:33:57