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Related Experiment Videos

The duration effect: a link between TTO and VAS values.

Benjamin M Craig1

  • 1Health Outcomes and Behavior Program, Moffitt Cancer Center, Tampa, FL 33612-9416, USA. Benjamin.Craig@moffitt.org

Health Economics
|March 21, 2008
PubMed
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The duration of a health state impacts its value. For good health, longer duration decreases value, while for poor health, it increases value, challenging the constant proportionality assumption.

Area of Science:

  • Health economics
  • Outcomes research
  • Psychometrics

Background:

  • The perceived value of a health state may be influenced by its duration.
  • The constant proportionality (CP) assumption is often used in health state valuation, but its validity regarding duration is debated.
  • Understanding duration effects is crucial for accurate health economic evaluations.

Purpose of the Study:

  • To test the constant proportionality (CP) assumption regarding the duration of health states.
  • To determine the direction of the relationship between duration and health state value.
  • To investigate the 'fair innings' and 'adaptation' hypotheses using real-world data.

Main Methods:

  • Utilized nationally representative data from the United Kingdom Measurement and Valuation of Health (UK-MVH) study.

Related Experiment Videos

  • Analyzed 42 distinct health states to assess the duration effect.
  • Empirically tested the CP assumption and the sign of the duration-value relationship.

    • Main Results:

    • The study rejected the constant proportionality (CP) assumption.
    • A negative relationship between duration and health state value was found for optimal health states (supporting the 'fair innings' argument).
    • A positive relationship was observed for poorer health states (supporting the 'adaptation' hypothesis).
    • No evidence supported the maximum endurable time hypothesis.

    Conclusions:

    • The duration of a health state significantly influences its perceived value, contradicting the CP assumption.
    • Findings suggest distinct psychological mechanisms (fair innings vs. adaptation) operate depending on health status.
    • These duration effects have critical implications for health outcomes research and the economic evaluation of healthcare interventions.