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Validation of SDM-Q-Doc Questionnaire to measure shared decision-making physician’s perspective in oncology practice

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Abstract

Objective

The aim of this study was to analyze the psychometric properties of the Shared Decision-Making Questionnaire–Physician version (SDM-Q-Doc) in a sample of medical oncologists who provide adjuvant treatment to patients with non-metastatic resected cancer and the correlations between the total SDM-Q-Doc score and physician satisfaction with the information provided.

Methods

Prospective, observational and multicenter study in which 32 medical oncologists and 520 patients were recruited. The psychometric properties, dimensionality, and factor structure of the SDM-Q-Doc were assessed.

Results

Exploratory factor analyses suggested that the most likely solution was two-dimensional, with two correlated factors: one factor regarding information and another one about treatment. Confirmatory factor analysis based on cross-validation showed that the fitted two-dimensional solution provided the best fit to the data. Reliability analyses revealed good accuracy for the derived scores, both total and sub-scale, with estimates ranging from 0.81 to 0.89. The results revealed significant correlations between the total SDM-Q-Doc score and physician satisfaction with the information provided (p < 0.01); between information sub-scale scores (factor 1) and satisfaction (p < 0.01), and between treatment sub-scale scores (factor 2) and satisfaction (p < 0.01). Medical oncologists of older age and those with more years of experience showed more interest in the patient preferences (p = 0.026 and p = 0.020, respectively). Patient age negatively correlated with SDM information (p < 0.01) and physicians appear to provide more information to young patients.

Conclusion

SDM-Q-Doc showed good psychometric properties and could be a helpful tool that examines physician’s perspective of SDM and as an indicator of quality and satisfaction in patients with cancer.

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Authors and Affiliations

Authors

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Correspondence to C. Calderon.

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Conflict of interest

All authors declare that they have no conflict of interest. This is an academic study.

Funding source

The study was supported by the FSEOM-Onvida for Projects on Long Survivors and Quality of Life. SEOM (Spanish Society of Medical Oncology) 2015.

Ethical statement

The study has been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments. This study is an observational trial without intervention.

Informed consent statement

Signed informed consent was obtained from all patients.

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Calderon, C., Ferrando, P.J., Carmona-Bayonas, A. et al. Validation of SDM-Q-Doc Questionnaire to measure shared decision-making physician’s perspective in oncology practice. Clin Transl Oncol 19, 1312–1319 (2017). https://doi.org/10.1007/s12094-017-1671-9

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  • DOI: https://doi.org/10.1007/s12094-017-1671-9

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