Development of a patient-reported outcome measure for the foot affected by rheumatoid arthritis

Walmsley, Steven; Ravey, Michael; Graham, Andrea; Teh, LeeSuan; Williams, Anita

Abstract

Objective: To develop an idiographic and nomothetic patient-reported outcome measure (PROM) for the assessment and evaluation of patients with feet affected by rheumatoid arthritis (RA).
Study Design and Setting: The development of the Salford Rheumatoid Arthritis Foot Evaluation (SAFE) Instrument PROM was divided into four stages: establishment of the PROM’s conceptual basis and content generation, following a descriptive phenomenological study; clinimetric instrument development; instrument pretesting, involving expert reviews and cognitive interviews; and demonstration
of instrument measurement properties, including convergent validity and testeretest reliability of the nomothetic scale.
Results: A total of 123 items were initially generated for the SAFE, with 25 of them clinimetrically selected for nomothetic scale(SAFE-Part A) and 80 items initially included in the idiographic scale (SAFE-Part B). The pretesting strategy proved effective for improving
and refining the SAFE, with the final draft consisting of 19 items in Part A and 42 items in Part B. The SAFE-Part A has strong evidence for convergent validity and testeretest reliability.
Conclusion: The SAFE features a nomothetic and idiographic assessment strategy that, with further development, will prove to be a valuable tool for clinicians involved in managing the foot health problems associated with RA.

Citation

Walmsley, S., Ravey, M., Graham, A., Teh, L., & Williams, A. (2012). Development of a patient-reported outcome measure for the foot affected by rheumatoid arthritis. Journal of Clinical Epidemiology, 65, 413-422. https://doi.org/10.1016/j.jclinepi.2011.11.00

• Journal Article Type: Article
• Publication Date: Jan 1, 2012
• Deposit Date: Feb 23, 2012
• Journal: Journal of Clinical Epidemiology
• Print ISSN: 0895-4356
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 65
• Pages: 413-422
• DOI: https://doi.org/10.1016/j.jclinepi.2011.11.00
• Publisher URL: http://dx.doi.org/10.1016/j.jclinepi.2011.11.00