Psychometric properties of a new treatment expectation scale in rheumatoid arthritis: an application of item response theory

BMC Musculoskeletal Disorders
Fowzia IbrahimHeidi Lempp

Abstract

Patient-generated health outcome measures are important in the assessment of long-term treatment goals for Rheumatoid Arthritis (RA), but few psychometrically sound measures are available. The MAPLe-RA (Measuring Actual Patient-Led expectations in RA) is a new questionnaire and its psychometric properties are not investigated. This study aims to examine these properties for each of the items using Item Response Theory (IRT) . Participants were included if they completed the scale (MAPLe-RA). A one parameter (Rasch) model and a two parameter logistic (2PL) model were applied to these data using M-plus software. One hundred thirty-eight patients with RA were included in the analysis. MAPLe-RA scale comprised of 21 items, the mean score was 71 (20.28) ranging from 0 to 105. Most items operated in the high expectations part of the items characteristics curves (ICC). Item discrimination varied widely, items with the highest discrimination capacity from the three domains were: pain (physical domain); control of my RA (self-management) and maintaining social role (psycho-social domain); feeling better overall and involvement in treatment decision making (impact of new treatment domain). RA patients' expectations of treatment are highe...Continue Reading

References

Mar 1, 1957·Annals of the Rheumatic Diseases·M W ROPESR A JESSAR
Jan 15, 2004·Annals of the Rheumatic Diseases·S P McKennaD J Veale
Sep 16, 2004·Value in Health : the Journal of the International Society for Pharmacoeconomics and Outcomes Research·Alan TennantPeter Hagell
Mar 22, 2007·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Maria Orlando Edelen, Bryce B Reeve
Oct 4, 2011·The Journal of Rheumatology·Liseth SiemonsCees A W Glas
Feb 14, 2012·Journal of Psychosomatic Research·Theodore D CoscoHannah McGee
Nov 2, 2012·BMC Musculoskeletal Disorders·Liseth SiemonsMart Afj Van de Laar
Apr 26, 2013·Health Expectations : an International Journal of Public Participation in Health Care and Health Policy·Darija HofmannHeidi Lempp
Nov 23, 2013·Journal of Clinical Epidemiology·Jakob B BjornerJohn E Ware

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