Robinson Angela, Spencer Anne
School of Medicine, Health Policy and Practice University of East Anglia, Norwich, UK.
Health Econ. 2006 Apr;15(4):393-402. doi: 10.1002/hec.1069.
The conventional time trade off (TTO) method relies on fundamentally different procedures to assess states better than and worse than dead. Arbitrary transformation mechanisms are then applied to worse than dead scores in order to achieve symmetry with those rated as better than dead. We use a 'life profile' approach along with a ranking procedure in order to show how states rated worse than dead may be assessed in exactly the same manner as better than dead scores. We then explore a common issue associated with states worse than dead that has received some attention recently: maximal endurable time. Our results showed that, although the severe health state was commonly rated as worse than dead, there were relatively few respondents that exhibited MET preferences. We discuss the implications of our findings for the use of the TTO method in deriving values for states that are worse than dead.
传统的时间权衡（TTO）方法依靠根本不同的程序来评估比死亡状态更好和更差的状态。然后将任意转换机制应用于比死亡状态更差的分数，以便与那些被评为比死亡状态更好的分数实现对称。我们使用“生命概况”方法以及排名程序，以展示如何以与比死亡状态更好的分数完全相同的方式评估比死亡状态更差的状态。然后，我们探讨了一个与比死亡状态更差的状态相关的常见问题，该问题最近受到了一些关注：最大可忍受时间。我们的结果表明，尽管严重健康状态通常被评为比死亡状态更差，但表现出最大可忍受时间偏好的受访者相对较少。我们讨论了我们的研究结果对于在推导比死亡状态更差的状态的值时使用TTO方法的意义。
