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The validity of time trade-off values in calculating QALYs: constant proportional time trade-off versus the proportional heuristic

Dolan, Paul and Stalmeier, Peep (2003) The validity of time trade-off values in calculating QALYs: constant proportional time trade-off versus the proportional heuristic. Journal of Health Economics, 22 (3). pp. 445-458. ISSN 0167-6296

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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.

Item Type: Article
Official URL: http://www.elsevier.com/wps/find/journaldescriptio...
Additional Information: © 2003 Elsevier
Library of Congress subject classification: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
Sets: Departments > Social Policy
Rights: http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx
Date Deposited: 09 Mar 2011 16:25
URL: http://eprints.lse.ac.uk/33066/

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