Psychometric properties of the SDM-Q-9 questionnaire for shared decision-making in multiple sclerosis: item response theory modelling and confirmatory factor analysis View Full Text


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Article Info

DATE

2017-01

AUTHORS

Javier Ballesteros, Ester Moral, Luis Brieva, Elena Ruiz-Beato, Daniel Prefasi, Jorge Maurino

ABSTRACT

BackgroundShared decision-making is a cornerstone of patient-centred care. The 9-item Shared Decision-Making Questionnaire (SDM-Q-9) is a brief self-assessment tool for measuring patients’ perceived level of involvement in decision-making related to their own treatment and care. Information related to the psychometric properties of the SDM-Q-9 for multiple sclerosis (MS) patients is limited. The objective of this study was to assess the performance of the items composing the SDM-Q-9 and its dimensional structure in patients with relapsing-remitting MS.MethodsA non-interventional, cross-sectional study in adult patients with relapsing-remitting MS was conducted in 17 MS units throughout Spain. A nonparametric item response theory (IRT) analysis was used to assess the latent construct and dimensional structure underlying the observed responses. A parametric IRT model, General Partial Credit Model, was fitted to obtain estimates of the relationship between the latent construct and item characteristics. The unidimensionality of the SDM-Q-9 instrument was assessed by confirmatory factor analysis.ResultsA total of 221 patients were studied (mean age = 42.1 ± 9.9 years, 68.3% female). Median Expanded Disability Status Scale score was 2.5 ± 1.5. Most patients reported taking part in each step of the decision-making process. Internal reliability of the instrument was high (Cronbach’s α = 0.91) and the overall scale scalability score was 0.57, indicative of a strong scale. All items, except for the item 1, showed scalability indices higher than 0.30. Four items (items 6 through to 9) conveyed more than half of the SDM-Q-9 overall information (67.3%). The SDM-Q-9 was a good fit for a unidimensional latent structure (comparative fit index = 0.98, root-mean-square error of approximation = 0.07). All freely estimated parameters were statistically significant (P < 0.001). All items presented standardized parameter estimates with salient loadings (>0.40) with the exception of item 1 which presented the lowest loading (0.26). Items 6 through to 8 were the most relevant items for shared decision-making.ConclusionsThe SDM-Q-9 presents appropriate psychometric properties and is therefore useful for assessing different aspects of shared decision-making in patients with multiple sclerosis. More... »

PAGES

79

References to SciGraph publications

  • 1997. Nonparametric Models for Polytomous Responses in HANDBOOK OF MODERN ITEM RESPONSE THEORY
  • 1997. Nonparametric Models for Dichotomous Responses in HANDBOOK OF MODERN ITEM RESPONSE THEORY
  • 2011-07-05. MS treatment adherence—how to keep patients on medication? in NATURE REVIEWS NEUROLOGY
  • 2016-08-02. Evaluating the quality of shared decision making during the patient-carer encounter: a systematic review of tools in BMC RESEARCH NOTES
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    http://scigraph.springernature.com/pub.10.1186/s12955-017-0656-2

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    http://dx.doi.org/10.1186/s12955-017-0656-2

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    https://app.dimensions.ai/details/publication/pub.1084954666

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28431587


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