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A Framework for Instrument Development of a Choice Experiment: An Application to Type 2 Diabetes

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A Commentary to this article was published on 12 July 2016

Abstract

Objective

Choice experiments are increasingly used to obtain patient preference information for regulatory benefit–risk assessments. Despite the importance of instrument design, there remains a paucity of literature applying good research principles. We applied a novel framework for instrument development of a choice experiment to measure type 2 diabetes mellitus treatment preferences.

Methods

Applying the framework, we used evidence synthesis, expert consultation, stakeholder engagement, pretest interviews, and pilot testing to develop a best–worst scaling (BWS) and discrete choice experiment (DCE). We synthesized attributes from published DCEs for type 2 diabetes, consulted clinical experts, engaged a national advisory board, conducted local cognitive interviews, and pilot tested a national survey.

Results

From published DCEs (n = 17), ten attribute categories were extracted with cost (n = 11) having the highest relative attribute importance (RAI) (range 6–10). Clinical consultation and stakeholder engagement identified six attributes for inclusion. Cognitive pretesting with local diabetes patients (n = 25) ensured comprehension of the choice experiment. Pilot testing with patients from a national sample (n = 50) identified nausea as most important (RAI for DCE: 10 [95 % CI 8.5–11.5]; RAI for BWS: 10 [95 % CI 8.9–11.1]). The developed choice experiment contained five attributes (A1c decrease, blood glucose stability, low blood glucose, nausea, additional medicine, and cost).

Conclusion

The framework for instrument development of a choice experiment included five stages of development and incorporated multiple stakeholder perspectives. Further comparisons of instrument development approaches are needed to identify best practices. To facilitate comparisons, researchers need to be encouraged to publish or discuss their instrument development strategies and findings.

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Acknowledgements

The authors sincerely thank the Johns Hopkins Institute for Clinical and Translational Research (ICTR) Community Research Advisory Council (C-RAC) and members of the Diabetes Action Board (DAB) for their valuable contributions and engagement in the research study. The authors also thank the respondents who participated in the study. Dr. Bridges contributed to the study design and conceptualization, the acquisition of the data, analysis and interpretation of data, and manuscript preparation and is the guarantor of this work. Ms. Janssen contributed to the study design and conceptualization, the acquisition of the data, analysis and interpretation of data, and manuscript preparation. Dr. Segal contributed to the acquisition of the data, analysis and interpretation of data, and manuscript preparation.

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Correspondence to Ellen M. Janssen.

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This work was supported by a Patient-Centered Outcomes Research Institute (PCORI) Methods Award (ME-1303-5946) and by the Center for Excellence in Regulatory Science and Innovation (CERSI) (1U01FD004977-01). The funders had no role in the design and conduct of the study, interpretation of the data, or preparation of the manuscript. Bridges, Janssen, and Segal have no competing financial or non-financial interests to disclose. This research was conducted in accordance with the Declaration of Helsinki, and, the study protocol was reviewed by the Johns Hopkins Institutional Review Board (IRB 6001).

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Janssen, E.M., Segal, J.B. & Bridges, J.F.P. A Framework for Instrument Development of a Choice Experiment: An Application to Type 2 Diabetes. Patient 9, 465–479 (2016). https://doi.org/10.1007/s40271-016-0170-3

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