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    Rasch analysis supports the use of the pain self-efficacy questionnaire

    Access Status
    Fulltext not available
    Authors
    Di Pietro, Flavia
    Catley, M.J.
    McAuley, J.H.
    Parkitny, L.
    Maher, C.G.
    Da Costa, L.C.M.
    Macedo, L.G.
    Williams, C.M.
    Moseley, G.L.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Di Pietro, F. and Catley, M.J. and McAuley, J.H. and Parkitny, L. and Maher, C.G. and Da Costa, L.C.M. and Macedo, L.G. et al. 2014. Rasch analysis supports the use of the pain self-efficacy questionnaire. Physical Therapy. 94 (1): pp. 91-100.
    Source Title
    Physical Therapy
    DOI
    10.2522/ptj.20130217
    ISSN
    0031-9023
    Faculty
    Faculty of Health Sciences
    School
    School of Pharmacy and Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/79569
    Collection
    • Curtin Research Publications
    Abstract

    Background. The Pain Self-Efficacy Questionnaire (PSEQ) is used by physical therapists in clinical practice and in research. However, current understanding of the PSEQ's measurement properties is incomplete, and investigators cannot be confident that it provides unbiased information on patient self-efficacy. Objective. The aims of this study were: (1) to investigate the scale properties of the PSEQ using Rasch analysis and (2) to determine whether age, sex, pain intensity, pain duration, and pain-related disability bias function of the PSEQ. Design. This was a retrospective study; data were obtained from 3 existing studies. Methods. Data were combined from more than 600 patients with low back pain of varying duration. Rasch analysis was used to evaluate targeting, category ordering, unidimensionality, person fit, internal consistency, and item bias. Results. There was evidence of adequate category ordering, unidimensionality, and internal consistency of the PSEQ. Importantly, there was no evidence of item bias. Limitations. The PSEQ did not adequately target the sample; instead, it targeted people with lower self-efficacy than this population. Item 7 was hardest for participants to endorse, showing excessive positive misfit to the Rasch model. Response strings of misfitting persons revealed older participants and those reporting high levels of disability. Conclusions. The individual items of the PSEQ can be validly summed to provide a score of self-efficacy that is robust to age, sex, pain intensity, pain duration, and disability. Although item 7 is the most problematic, it may provide important clinical information and requires further investigation before its exclusion. Although the PSEQ is commonly used with people with low back pain, of whom the sample in this study was representative, the results suggest it targets patients with lower self-efficacy than that observed in the current sample. © 2014 American Physical Therapy Association.

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