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The TTO method and procedural invariance.

Anne Spencer1

  • 1Department of Economics, Queen Mary, University of London, UK. a.e.spencer@qmul.ac.uk

Health Economics
|August 5, 2003
PubMed
Summary
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This pilot study explored how different ways of asking about health care preferences affect responses. Findings suggest that while quantitative results were unclear, qualitative data indicate distinct considerations when valuing longer life in lower quality states.

Area of Science:

  • Health Economics
  • Decision Science
  • Patient Preference Research

Background:

  • Understanding patient preferences is crucial for healthcare decision-making.
  • Conventional methods like the time trade-off (TTO) question are widely used.
  • Variations in elicitation procedures may influence stated preferences.

Purpose of the Study:

  • To investigate if altering the preference elicitation procedure impacts inferences about health care treatments.
  • To compare a conventional TTO with an unconventional TTO that values longer life in lower quality states.

Main Methods:

  • A pilot study was conducted using two distinct time trade-off (TTO) question formats.
  • Quantitative data were collected to measure preferences for health care treatments.

Related Experiment Videos

  • Qualitative data were gathered to explore respondents' reasoning and experiences.

    • Main Results:

    • Quantitative data showed equivocal results regarding differences in treatment preferences between the two TTO methods.
    • Qualitative data suggested that respondents perceived contrasting issues when considering prolonged life in a lower quality of life.

    Conclusions:

    • The study highlights potential nuances in preference elicitation, particularly concerning the valuation of extended life in diminished health states.
    • Qualitative insights may explain the lack of clear quantitative differences, suggesting a need for further methodological exploration in patient preference research.