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Application of the health assessment questionnaire disability index to various rheumatic diseases

PURPOSE: To investigate whether the Stanford Health Assessment Questionnaire Disability Index (HAQ-DI) can serve as a generic instrument for measuring disability across different rheumatic diseases and to propose a scoring method based on item response theory (IRT) modeling to support this goal. MET...

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Detalles Bibliográficos
Autores principales: van Groen, Maaike M., ten Klooster, Peter M., Taal, Erik, van de Laar, Mart A. F. J., Glas, Cees A. W.
Formato: Texto
Lenguaje:English
Publicado: Springer Netherlands 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2963741/
https://www.ncbi.nlm.nih.gov/pubmed/20559736
http://dx.doi.org/10.1007/s11136-010-9690-9
Descripción
Sumario:PURPOSE: To investigate whether the Stanford Health Assessment Questionnaire Disability Index (HAQ-DI) can serve as a generic instrument for measuring disability across different rheumatic diseases and to propose a scoring method based on item response theory (IRT) modeling to support this goal. METHODS: The HAQ-DI was administered to a cross-sectional sample of patients with confirmed rheumatoid arthritis (n = 619), osteoarthritis (n = 125), or gout (n = 102). The results were analyzed using the generalized partial credit model as an IRT model. RESULTS: It was found that 4 out of 8 item categories of the HAQ-DI displayed substantial differential item functioning (DIF) over the three diseases. Further, it was shown that this DIF could be modeled using an IRT model with disease-specific item parameters, which produces measures that are comparable for the three diseases. CONCLUSION: Although the HAQ-DI partially functioned differently in the three disease groups, the measurement regarding the disability level of the patients can be made comparable using IRT methods.