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| Research article summary (published 29 Apr 2003): |
The validity of time trade-off values in calculating QALYs: constant proportional time trade-off versus the proportional heuristic.
Full Abstract
In order to calculate quality adjusted life years (QALYs) from time trade-off (TTO) responses, individual preferences are required to satisfy the constant proportional time trade-off (CPTTO) assumption. Respondents who use a simple proportional heuristic may appear to satisfy CPTTO but will in fact generate preference reversals for states that are associated with a maximal endurable time (MET). Using data from 91 respondents, the study reported here examines the extent to which valuations satisfy the CPTTO assumption and the extent to which they might be generated by the proportional heuristic. The results suggest that respondents are using a proportional heuristic that casts doubt on the validity of using the TTO method to calculate QALYs for health states that are associated with MET preferences.
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Author information
Author/s: Dolan, Paul (P); Stalmeier, Peep (P);
Affiliation: Department of Economics, Sheffield Health Economics Group, University of Sheffield, 30 Regene Street, Sheffield S1 4DA, UK. p.dolan(-atsign-)shef.ac.uk
Journal and publication information
Publication Type: Journal Article
Journal: Journal of health economics (J Health Econ), published in Netherlands. (Language: eng)
Reference: 2003-May; vol 22 (issue 3) : pp 445-58
Dates: Created 2003/04/09; Completed 2003/06/10; Revised 2004/11/17;
PMID: 12683961, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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