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Table 1 Overview of modifications and hypotheses tested in this study

From: Valuation of the EQ-5D-5L with composite time trade-off for the German population – an exploratory study

Modification Hypotheses tested
Ranking task Introducing the ranking task prior to the cTTO valuation will reduce the inconsistencies and improves the overall data quality (i.e. more WTD responses).
BTD/WTD split Separating the BTD and WTD cTTO tasks will reduce the inconsistencies of the valuations and improve the overall data quality (i.e. more WTD responses, higher values for mild heath state and fewer spikes).
Feedback module Presenting respondents with the rank ordering implied by their cTTO valuations will reduce the inconsistencies as they will identify and flag problematic valuations for removal from the data.