Analysis of the psychometric properties of the American Orthopaedic Foot and Ankle Society Score (AOFAS) in rheumatoid arthritis patients: Application of the Rasch model

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Abstract

Objective: To tested the reliability and validity of Aofas in a sample of rheumatoid arthritispatients. Methods: The scale was applicable to rheumatoid arthritis patients, twice by the interviewer1 and once by the interviewer 2. The Aofas was subjected to test-retest reliability analysis (with 20 Rheumatoid arthritis subjects). The psychometric properties were investigatedusing Rasch analysis on 33 Rheumatoid arthritis patients. Results: Intra-Class Correlation Coefficient (ICC) were (0.90 < ICC < 0.95; p < 0.001) for intra-observer reliability and (0.75 < ICC < 0.91; p < 0.001) for inter-observer reliability. Subjectsseparation rates were 1.9 and 4.75 for the items, showing that patients fell into three abilitylevels, and the items were divided into six difficulties levels. The Rasch analysis showed thateight items was satisfactory. One erroneous item have been identified, showing percentagesabove the 5% allowed by the statistical model. Further Rasch modeling suggested revisingthe original item 8. Conclusions: The results suggest that the Brazilian versions of Aofas exhibit adequate reliability, construct validity, response stability. These findings indicate that Aofas Ankle-Hindfootscale presents a significant potential for clinical applicability in individuals with rheumatoidarthritis. Other studies in populations with other characteristics are now underway.

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Da Conceição, C. S., Neto, M. G., Neto, A. C., Mendes, S. M. D., Baptista, A. F., & Sá, K. N. (2016). Analysis of the psychometric properties of the American Orthopaedic Foot and Ankle Society Score (AOFAS) in rheumatoid arthritis patients: Application of the Rasch model. Revista Brasileira de Reumatologia, 56(1), 8–13. https://doi.org/10.1016/j.rbre.2014.12.003

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