This paper describes and employs a new method to correct time tradeoff (TTO)-scores for utility of life duration curvature. In contrast to most previous attempts to do so, it uses a risk-free method that corresponds well to the risk-free properties of the TTO-method. In addition, the method is robust to several biases that occur under methods that incorporate risk. Our results show a significant degree of curvature in utility of life duration and therefore a clear bias in TTO-scores. The risk-free method seems to be useful to correct TTO-scores for this influence and leads to significantly higher quality-adjustment factors.

Double discounting, Risk-free method, Time tradeoff method, Utility of life duration, health risk, health survey, risk assessment, trade-off,
Journal of Health Economics
Erasmus MC: University Medical Center Rotterdam

Attema, A.E, & Brouwer, W.B.F. (2009). The correction of TTO-scores for utility curvature using a risk-free utility elicitation method. Journal of Health Economics, 28(1), 234–243. doi:10.1016/j.jhealeco.2008.10.004