van Nooten Floortje, Brouwer Werner
Institute for Medical Technology Assessment, Erasmus University Rotterdam, The Netherlands.
Health Econ. 2004 Aug;13(8):819-23. doi: 10.1002/hec.873.
When answering TTO questions respondents sometimes have to imagine being in a certain health state during their remaining lifespan, often based on objective life tables. Respondents however may have subjective expectations about length and quality of life that differ from the objective ones. If respondents do not fully abstract from own expectations, TTO scores may be biased. In this note, we indicate how subjective expectations could influence TTO scores and present some empirical findings suggesting that they do. Our results indicate that subjective expectations may serve as unobserved reference points and as such influence TTO responses.
在回答时间权衡法（TTO）问题时，受访者有时必须基于客观生命表，设想在其剩余寿命期间处于某种健康状态。然而，受访者可能对生活长度和质量有不同于客观情况的主观期望。如果受访者没有完全抛开自身期望，时间权衡法得分可能会有偏差。在本报告中，我们指出主观期望如何可能影响时间权衡法得分，并给出一些实证研究结果表明它们确实会产生影响。我们的结果表明，主观期望可能作为未被观察到的参考点，进而影响时间权衡法的回答。
