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    Assessment of patients' expectations: Development and validation of the Expectation for Treatment Scale (ETS)

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    Author
    Barth, J.
    Kern, A.
    Witt, Claudia M.
    Date
    2019
    Journal
    BMJ Open
    Publisher
    BMJ Publishing Group
    Type
    article
    
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    See at
    https://doi.org/10.1136/bmjopen-2018-026712
    Abstract
    Objective To develop a short self-report instrument for the assessment of expectations (Expectation for Treatment Scale(ETS)) using acupuncture as a case example. Design A cross-sectional assessment with retest after 1 week. Setting A web-based survey with patients suffering from pain. Methods In a three-step approach, we reduced the initially collected number of items from 17 to 9 and to 5, including expectations about coping ability, vitality, physical health and reduction of patient complaints. Items were selected according to internal consistency (Cronbach's alpha); convergent and divergent validities with related constructs (optimism, pessimism, resilience, perceived sensitivity to medicines, depression and others); 1-week retest reliability (intraclass correlation coefficient (ICC)); and exploratory and confirmatory factor analysis (CFA). Results A total of 102 patients suffering from pain were included, and 54 of these patients completed the retest assessment. The final version of the ETS consisted of five items and had an excellent Cronbach's alpha (0.90), with 72.33% variance on one single factor. Depression, pessimism and perceived sensitivity to medicines showed positive correlations with our expectation measure (r=0.23, r=0.20 and r=0.34, respectively); the correlation between the ETS and optimism was low (r=-0.07) and no correlation between the ETS and resilience was found (r=-0.07). Convergent validity was confirmed with a high correlation (r>0.90) between ETS and a treatment-specific measure of expectations. The retest ICC was 0.86, which showed high stability over 1 week. A CFA (n=439) with data from patients with low back pain confirmed the single-factor structure of the instrument. Conclusion The ETS showed strong psychometric properties and covered a distinct construct. As the next step, the ETS might be implemented in different clinical conditions and settings to investigate psychometrics and its predictive power for treatment outcomes.
    Sponsors
    Funding This study was funded by the Swiss National Science Foundation (Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung), grant number 105319_159833.
    Keyword
    acupuncture
    assessment
    expectations
    optimism
    pain
    placebo
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067474284&doi=10.1136%2fbmjopen-2018-026712&partnerID=40&md5=ca604fb0ef49371a722ca533112e7576; http://hdl.handle.net/10713/10247
    ae974a485f413a2113503eed53cd6c53
    10.1136/bmjopen-2018-026712
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