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The correction of TTO-scores for utility curvature using a risk-free utility elicitation method
Arthur E Attema1, Werner B F Brouwer
1Department of Health Policy and Management, Erasmus University Medical Centre, PO Box 1738, 3000 DR Rotterdam, The Netherlands. a.attema@erasmusmc.nl
Abstract:
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.
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