van der Pol Marjon, Roux Larissa
Department of Community Health Sciences, University of Calgary, Canada.
Eur J Health Econ. 2005 Jun;6(2):107-11. doi: 10.1007/s10198-004-0265-y.
This study examined whether time trade-off (TTO) values adjusted for time preferences are more consistent with individuals' preferences. This was carried out by testing the constant proportional trade-off (CPTO) assumption, and both individual specific and standard discount rates were used. The results show that the mean adjustment factor is around 0.03. This may influence relative cost-effectiveness in economic evaluations. The CPTO assumption holds with respect to both unadjusted TTO values and TTO values adjusted for individuals'time preference, and therefore no conclusions can be drawn as to whether the adjusted values are more consistent with individuals' preferences. However, the CPTO assumption is violated when standard discount rates are used. This clearly shows that the use of standard discount rates should be avoided. Further exploration of the time preference bias and other biases in TTO is identified as an important area of future research.
本研究考察了针对时间偏好进行调整后的时间权衡（TTO）值是否更符合个体偏好。这是通过检验恒定比例权衡（CPTO）假设来进行的，同时使用了个体特定贴现率和标准贴现率。结果表明，平均调整因子约为0.03。这可能会影响经济评估中的相对成本效益。CPTO假设对于未调整的TTO值和针对个体时间偏好进行调整的TTO值均成立，因此无法得出调整后的值是否更符合个体偏好的结论。然而，当使用标准贴现率时，CPTO假设不成立。这清楚地表明应避免使用标准贴现率。确定对TTO中的时间偏好偏差和其他偏差进行进一步探索是未来研究的一个重要领域
