The online version of this article (doi:10.1186/s12891-015-0690-3) contains supplementary material, which is available to authorized users.
The authors declare that they have no competing interests.
FI: had main responsibility for conducting the data analysis and wrote the first draft of the paper and overseeing the submission process. SA: contributed to the data analysis and editing of the paper. HL: proposed the idea of the study and contributed to the editing of the paper. DLS, AC, TW, DR & DH: contributed editing the paper. All authors have seen and approved the final version of the paper before submission.
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 higher in the physical and psycho-social domains and less so in the impact of new treatment domain.
Additional file 1: Table S1. Factor loading for MAPLe-RA scale. (DOCX 17 kb)12891_2015_690_MOESM1_ESM.docx
Hofmann D, Ibrahim F, Rose D, Scott DL, Cope A, Wykes T, et al. Expectations of new treatment in rheumatoid arthritis: developing a patient-generated questionnaire. Health Expect 2013;doi: 10.1111/hex.12073.
Tay L, Diener E, Drasgow F, Vermunt JK. Multilevel Mixed-measurement IRT analysis: an explication and application to self-reported emotions across the world. Organ Res Methods. 2011;14(1):177–207. CrossRef
Wolfe F. Which HAQ is best? A comparison of the HAQ, MHAQ and RA-HAQ, a difficult 8 item HAQ (DHAQ), and a rescored 20 item HAQ (HAQ20): analyses in 2,491 rheumatoid arthritis patients following leflunomide initiation. J Rheumatol. 2001;28(5):982–9. PubMed
Wolfe F. Pain extent and diagnosis: development and validation of the regional pain scale in 12,799 patients with rheumatic disease. J Rheumatol. 2003;30(2):369–78. PubMed
Scheerens JGCAWTS. Educational evaluation, assessment, and monitoring: a systemic approach. Lisse [Netherlands]; Exton, PA: Swets & Zeitlinger; 2003.
Bowling A, Rowe G, Lambert N, Waddington M, Mahtani KR, Kenten C, et al. The measurement of patients’ expectations for health care: a review and psychometric testing of a measure of patients’ expectations. Health Technol Assess (Winchester, England). 2012;16:30. i-xii, 1–509.
- Psychometric properties of a new treatment expectation scale in rheumatoid arthritis: an application of item response theory
David L. Scott
- BioMed Central
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