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Evaluating health related quality of life: An indifference curve interpretation for the time trade-off technique

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  • Mehrez, Abraham
  • Gafni, Amiram

Abstract

A commonly used method of measuring cardinal preferences for the purpose of evaluating health related quality of life is the time trade-off (TTO) technique. The TTO technique, although offered as a substitute to the standard gamble (SG) technique, is not related in a general way to any existing behavioral theory. We suggest that in the context of value function theory the TTO technique is a method which enables us to identify different points on an individual's indifference curve in his evaluation space. Creating a formal theoretical foundation for the TTO technique enables us to better understand and interpret the outcome of our measurements. We show, for example, that the current way of calculating the value preference of a given health state assumes a very specific set of value functions. This assumption has not been validated in empirical studies and thus casts doubt upon the interpretation of these values as being the value preferences of individuals for these health states.

Suggested Citation

  • Mehrez, Abraham & Gafni, Amiram, 1990. "Evaluating health related quality of life: An indifference curve interpretation for the time trade-off technique," Social Science & Medicine, Elsevier, vol. 31(11), pages 1281-1283, January.
    • Handle: RePEc:eee:socmed:v:31:y:1990:i:11:p:1281-1283
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    Citations

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    Cited by:

    1. Gafni, Amiram & Birch, Stephen, 1997. "QALYs and HYEs Spotting the differences," Journal of Health Economics, Elsevier, vol. 16(5), pages 601-608, October.
    2. Ried, Walter, 1998. "QALYs versus HYEs--what's right and what's wrong. A review of the controversy," Journal of Health Economics, Elsevier, vol. 17(5), pages 607-625, October.
    3. Buckingham, Ken J. & Devlin, Nancy Joy, 2009. "A note on the nature of utility in time and health and implications for cost utility analysis," Social Science & Medicine, Elsevier, vol. 68(2), pages 362-367, January.
    4. Arthur E. Attema & Werner B.F. Brouwer, 2014. "Deriving Time Discounting Correction Factors For Tto Tariffs," Health Economics, John Wiley & Sons, Ltd., vol. 23(4), pages 410-425, April.
    5. Hans-Helmut König & Oliver Günther & Matthias Angermeyer & Christiane Roick, 2009. "Utility Assessment in Patients with Mental Disorders," PharmacoEconomics, Springer, vol. 27(5), pages 405-419, May.
    6. Linda D. MacKeigan & Amiram Gafni & Bernie J. O'Brien, 2003. "Double discounting of QALYs," Health Economics, John Wiley & Sons, Ltd., vol. 12(2), pages 165-169, February.
    7. Somayeh Sadat & Michael Carter & Brian Golden, 2013. "Theory of constraints for publicly funded health systems," Health Care Management Science, Springer, vol. 16(1), pages 62-74, March.

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