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

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 psych...

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Detalles Bibliográficos
Autores principales: Ibrahim, Fowzia, Ayis, Salma, Hofmann, Darija, Rose, Diana, Wykes, Til, Cope, Andrew, Scott, David L., Lempp, Heidi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4559926/
https://www.ncbi.nlm.nih.gov/pubmed/26340921
http://dx.doi.org/10.1186/s12891-015-0690-3
Descripción
Sumario: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. 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.