An exploration of the non-iterative time trade-off method to value health states

Health Economics
Yan FengBen van Hout

Abstract

Time Trade-Off (TTO) usually relies on "iteration," which is susceptible to bias. Discrete Choice Experiment with duration (or DCETTO ) is free of such bias, but respondents find this cognitively more challenging. This paper explores non-iterative TTO with or without lead time: NI(LT)TTO. In NI(LT)TTO, respondents see a series of independent pairwise choices without iteration (similar to DCETTO ), but one of the two scenarios always involves full health for a shorter duration (similar to TTO). We compare three different "types" of NI(LT)TTO relative to DCETTO . Each type is presented in two "modes": (a) verbally tabulated (as in a DCE) and (b) with visual aids (as in a TTO). The study has 8 survey variants, each with 12 experimental choice tasks and a 13th task with a logically determined answer. Data on the 12 experimental choices from an online survey of 6,618 respondents are modelled, by variant, using conditional logistic regressions. The results indicate that NI(LT)TTO is feasible, but some relatively mild states appear to have implausibly low predicted values, and the range of predicted values is much narrower than in DCETTO . The presentation of NI(LT)TTO tasks needs further improvement.

References

Jan 1, 1994·Medical Decision Making : an International Journal of the Society for Medical Decision Making·D L PatrickR A Pearlman
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Apr 12, 2011·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·M HerdmanX Badia
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Jun 21, 2012·Health Economics·Nancy DevlinBen van Hout
Mar 5, 2013·Medical Decision Making : an International Journal of the Society for Medical Decision Making·Laura Ternent, Aki Tsuchiya
Feb 27, 2014·Health Technology Assessment : HTA·Brendan MulhernAki Tsuchiya
Sep 30, 2016·Medical Decision Making : an International Journal of the Society for Medical Decision Making·Brendan MulhernAki Tsuchiya

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Software Mentioned

MO2xD
NILTTTO
NITTO
Stata
Ngene Choice Metrics
Ngene

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