Time-tradeoff Utility Assessment with Equal Horizons: Would You Prefer “Good then Bad” or “Moderate”?
Problem Statement
PPT Slide
Problem: People won’t gamble, trade.
Implications for utility assessments of health states
Solution for the “they won’t play” problem: A new method?
Proposed method: Time in State Tradeoff (TISTO).
Elements of all UA methods we used
Rating Judgment
Verbal Description: Uncontrollable Metastatic Prostate Cancer
Utility derived from rating judgment
Standard Gamble (SG) Visual aids: Life line ruler, probability wheel.
Utility derived from Standard Gamble
Time Trade Off (TTO) Visual Aid: 2 life line rulers
Utility derived from Time Tradeoff
Time in State Tradeoff (TISTO) Visual Aids: 2 life line rulers
Utility derived from Time in State Tradeoff
Summary: Notable Features of our Utility Assessments
Description of study
Method: Standard Gamble
Results: Standard gamble utilities
Results: Time Tradeoff
Results: Time in State Tradeoff
Females were more likely than males not to trade and not to gamble. Same as Volk et al found with TTO.
Results: Visual Analogue Scale Ratings
Results: Comparison of proportion of trade/gamble refusals, our TISTO and SG versus Volk et al’s TTO, male subjects only.
Discussion: Goals
Discussion: Time in State Tradeoff (TISTO)
Discussion: Standard Gamble (SG)
Discussion: The severity of the worst state W is crucial to the feasibility of the method
Questions for further research
Email: robert-hamm@ouhsc.edu
Home Page: http://www.fammed.ouhsc.edu/robhamm/index.htm