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- Title
Application of the health assessment questionnaire disability index to various rheumatic diseases.
- Authors
Groen, Maaike M. van; Klooster, Peter M. ten; Taal, Erik; van de Laar, Mart A. F. J.; Glas, Cees A. W.
- Abstract
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.
- Subjects
RHEUMATISM; ITEM response theory; HEALTH risk assessment; HEALTH surveys; QUANTITATIVE research
- Publication
Quality of Life Research, 2010, Vol 19, Issue 9, p1255
- ISSN
0962-9343
- Publication type
Article
- DOI
10.1007/s11136-010-9690-9