What is the difference between the VAS and TTO techniques?
The difference between the TTO- and VAS-based value sets is that the techniques used to elicit the values on which the models are based differ. In the TTO task, respondents are asked to imagine that they will live in a certain health state (e.g. 33333) for 10 years and have to specify the amount of time they would be willing to give up to live in full health instead (i.e. 11111). For example, someone might find 8 years in 11111 equivalent to 10 years in 33333. The VAS technique on the other hand, asks people to indicate where, on a vertical thermometer-like scale ranging from best imaginable health to worst imaginable health, they think a health state should be positioned.
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