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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: J Health Econ. 2011 Jul 21;30(5):1057–1063. doi: 10.1016/j.jhealeco.2011.07.009

Figure 1.

Figure 1

Time Trade-off Responses

The bars illustrate the frequency of the TTO responses for unconscious. Each response represents a unique slope reflecting health utility on a QALY scale.

A: The TTO response that 8 years in optimal health equals 10 years in non-optimal health implies that 1 year in the non-optimal health equals 0.8 QALYs (8/10).

B: The TTO response that 9.75 years in optimal health followed by 0.25 years in non-optimal health equals immediate death implies that 0.25 years in non-optimal health equals −9.75 QALYs or that 1 year equals −39 QALYs (−9.75/0.25).