The Performance of Kaizen Tasks Across Three Online Discrete Choice Experiment Surveys: An Evidence Synthesis

Benjamin Matthew Craig (), Maksat Jumamyradov and Oliver Rivero-Arias
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Benjamin Matthew Craig: University of South Florida
Maksat Jumamyradov: University of South Florida
Oliver Rivero-Arias: University of Oxford

The Patient: Patient-Centered Outcomes Research, 2024, vol. 17, issue 6, No 3, 635-644

Abstract: Abstract Background Kaizen is a Japanese term for continuous improvement (kai ~ change, zen ~ good). In a kaizen task, a respondent makes sequential choices to improve an object’s profile, revealing a preference path. Including kaizen tasks in a discrete choice experiment has the advantage of collecting greater preference evidence than pick-one tasks, such as paired comparisons. Objective and Methods So far, three online discrete choice experiments have included kaizen tasks: the 2020 US COVID-19 vaccination (CVP) study, the 2021 UK Children’s Surgery Outcome Reporting (CSOR) study, and the 2023 US EQ-5D-Y-3L valuation (Y-3L) study. In this evidence synthesis, we describe the performance of the kaizen tasks in terms of response behaviors, conditional logit and Zermelo–Bradley–Terry (ZBT) estimates, and their standard errors in each of the surveys. Results Comparing the CVP and Y-3L, including hold-outs (i.e., attributes shared by all alternatives) seems to reduce positional behavior by half. The CVP tasks excluded multi-level improvements; therefore, we could not estimate logit main effects directly. In the CSOR, only 12 of the 21 logit estimates are significantly positive (p

Date: 2024
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DOI: 10.1007/s40271-024-00708-4

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