Head-to-head comparison of health-state values derived by a probabilistic choice model and scores on a visual analogue scale.

Eur J Health Econ

Outcomes and Policy College of Pharmacy, Department of Pharmacy Systems, University of Illinois at Chicago, 833 South Wood St, MC 886, Chicago, IL, 60612, USA.

Published: November 2017

Background: Health states were quantified based on discrete choice (DC) modeling and visual analogue scale (VAS) values using the five-level version of the EQ-5D (EQ-5D-5L). The aim of this study was to determine the extent of the relationship between DC derived values (indirect method) and VAS values (direct method).

Methods: Data were collected in Canada, the United Kingdom, the Netherlands, and the United States. Respondents were asked to perform paired comparisons between two EQ-5D-5L health states for DC. In total, 400 different EQ-5D-5L states were included. After each DC task, respondents were prompted to score the two states one after another on a VAS. Intraclass correlation coefficients were calculated between DC and VAS values and illuminating graphs were designed.

Results: Approximately 400 respondents participated from each country. High similarity [individual intraclass correlation coefficients (ICC) >0.85] of DC and moderate correspondence of VAS values were observed for the four countries. Cross-country comparison of DC values shows a nonlinear relationship to the VAS values.

Conclusion: EQ-5D-5L derived DC and VAS values show a close but nonlinear relationship. Given the obvious biases associated with the VAS, DC methods based on ordinal responses may be a better alternative.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5602004PMC
http://dx.doi.org/10.1007/s10198-016-0841-yDOI Listing

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