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The TTO method and procedural invariance

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  • Anne Spencer

Abstract

In a pilot study we investigate whether the inferences we draw about people's preferences towards health care treatments are altered if we vary the procedure that is used to elicit these preferences. In a conventional time trade‐off (TTO) question, respondents express their preferences towards treatment by comparing a period of ill‐health with a shorter period in a higher quality of life. In our less conventional TTO question, we vary the procedure by asking respondents their preferences towards treatment by comparing a period of ill‐health with a longer period in a lower quality of life. The quantitative data are equivocal about whether preferences for treatment differ between the conventional and unconventional questions. The qualitative data support the notion of contrasting issues in the questions that involve prolonging time in a lower quality of life and appear to account for a failure to find quantitative differences in all of the questions. Copyright © 2002 John Wiley & Sons, Ltd.

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  • Anne Spencer, 2003. "The TTO method and procedural invariance," Health Economics, John Wiley & Sons, Ltd., vol. 12(8), pages 655-668, August.
    • Handle: RePEc:wly:hlthec:v:12:y:2003:i:8:p:655-668
    DOI: 10.1002/hec.768
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    1. Arthur Attema & Werner Brouwer, 2012. "The way that you do it? An elaborate test of procedural invariance of TTO, using a choice-based design," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 13(4), pages 491-500, August.
    2. Richard T. Carson, 2011. "Contingent Valuation," Books, Edward Elgar Publishing, number 2489.
    3. Richard Norman & Rosalie Viney, 2008. "The effect of discounting on quality of life valuation using the Time Trade-Off, CHERE Working Paper 2008/3," Working Papers 2008/3, CHERE, University of Technology, Sydney.
    4. Anne Spencer, 2004. "The implications of linking questions within the SG and TTO methods," Health Economics, John Wiley & Sons, Ltd., vol. 13(8), pages 807-818, August.
    5. F. E. van Nooten & X. Koolman & W. B. F. Brouwer, 2009. "The influence of subjective life expectancy on health state valuations using a 10 year TTO," Health Economics, John Wiley & Sons, Ltd., vol. 18(5), pages 549-558, May.
    6. Arthur E. Attema & Werner B. F. Brouwer, 2008. "Can we fix it? Yes we can! But what? A new test of procedural invariance in TTO‐measurement," Health Economics, John Wiley & Sons, Ltd., vol. 17(7), pages 877-885, July.
    7. Rosalie Viney & Richard Norman & John Brazier & Paula Cronin & Madeleine T. King & Julie Ratcliffe & Deborah Street, 2014. "An Australian Discrete Choice Experiment To Value Eq‐5d Health States," Health Economics, John Wiley & Sons, Ltd., vol. 23(6), pages 729-742, June.
    8. Rosalie Viney & Elizabeth Savage, 2006. "Health care policy evaluation: empirical analysis of the restrictions implied by Quality Adjusted Life Years, CHERE Working Paper 2006/10," Working Papers 2006/10, CHERE, University of Technology, Sydney.
    9. Spencer, Anne & Rivero-Arias, Oliver & Wong, Ruth & Tsuchiya, Aki & Bleichrodt, Han & Edwards, Rhiannon Tudor & Norman, Richard & Lloyd, Andrew & Clarke, Philip, 2022. "The QALY at 50: One story many voices," Social Science & Medicine, Elsevier, vol. 296(C).
    10. Oliver, Adam & Wolff, Jonathan, 2014. "Are people consistent when trading time for health?," Economics & Human Biology, Elsevier, vol. 15(C), pages 41-46.
    11. Ken Buckingham & Nancy Devlin, 2006. "A theoretical framework for TTO valuations of health," Health Economics, John Wiley & Sons, Ltd., vol. 15(10), pages 1149-1154, October.
    12. Buckingham, K. & Devlin, N. & Tabberer, M., 2004. "A theoretical framework for TTO valuations and a taxonomy of TTO approaches: results from a pilot study," Working Papers 04/07, Department of Economics, City University London.
    13. Bleichrodt, Han & Pinto, Jose Luis & Maria Abellan-Perpinan, Jose, 2003. "A consistency test of the time trade-off," Journal of Health Economics, Elsevier, vol. 22(6), pages 1037-1052, November.
    14. Arthur Attema & Yvette Edelaar-Peeters & Matthijs Versteegh & Elly Stolk, 2013. "Time trade-off: one methodology, different methods," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 14(1), pages 53-64, July.

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