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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Musculoskeletal Disorders 1/2015

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

Zeitschrift:
BMC Musculoskeletal Disorders > Ausgabe 1/2015
Autoren:
Fowzia Ibrahim, Salma Ayis, Darija Hofmann, Diana Rose, Til Wykes, Andrew Cope, David L. Scott, Heidi Lempp
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12891-015-0690-3) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

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.

Abstract

Background

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) .

Methods

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.

Results

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).

Conclusion

RA patients’ expectations of treatment are higher in the physical and psycho-social domains and less so in the impact of new treatment domain.
Zusatzmaterial
Additional file 1: Table S1. Factor loading for MAPLe-RA scale. (DOCX 17 kb)
12891_2015_690_MOESM1_ESM.docx
Literatur
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