A uniform Time Trade Off method for states better and worse than dead: feasibility study of the ‘lead time’ approach

Devlin, N., Tsuchiya, A., Buckingham, K. & Tilling, C. (2009). A uniform Time Trade Off method for states better and worse than dead: feasibility study of the ‘lead time’ approach (Report No. 09/08). London, UK: Department of Economics, City University London.

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Abstract

The way Time Trade Off (TTO) values are elicited for states of health considered ‘worse than being dead’ has important implications for the mean values used in economic evaluation. Conventional approaches to TTO, as used in the UK’s ‘MVH’ value set, are problematic because they require fundamentally different tradeoffs tasks for the valuation of
states better and worse than dead. This study aims to refine and test the feasibility of a new approach described by Robinson and Spencer (2006), and to explore the characteristics of the valuation data it generates. The approach introduces a ‘lead time’ into the TTO, producing a uniform procedure for generating values either >0 or <0. We used this lead time TTO to value 10 moderate to severe EQ-5D states using a sample of the general public (n=109). We conclude that the approach is feasible for use in valuation studies, and appears to overcome the discontinuity in values around 0 evident in conventional methods. However, further research is required to resolve the issue of how to handle participants who ‘use up’ all lead time; to develop ways of controlling for individual time preferences; and to better understand the implications for valuations of states better than dead.

Item Type: Monograph (Discussion Paper)
Additional Information: This study was supported by a grant from the EuroQol Foundation.
Uncontrolled Keywords: TTO, constant proportionality, states worse than dead
Subjects: H Social Sciences > HB Economic Theory
Divisions: School of Social Sciences > Department of Economics > Department of Economics Discussion Paper Series
URI: http://openaccess.city.ac.uk/id/eprint/1492

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