Rating scale values were similar to SF36 and significantly lower (Mann-Whitney test, p < 0.001) than those obtained using time trade-off and standard gamble.
As we already reported in previous works exploiting UceWeb [31, 37], standard gamble and time trade-off scores are similar but of course not identical, and the mean of their values seems to better describe the overall QoL than considering each of the scores separately.
Standard gamble and time trade-off methods provided values that were significantly lower than those provided by rating scale and SF36.
Two works from Lin and colleagues [53, 54] report using standard gamble and time trade-off methods, administered through telephone interviews, for the assessment of QoL in SCI patients.
First of all, we decided to set up the elicitation tool such as all the sessions had the same ordering of the methods, that is, rating scale first, time trade-off second, and standard gamble last.
Mozes, "A comparison of three measures: The time trade-off technique, global health-related quality of life and the SF-36 in dialysis patients," Journal of Clinical Epidemiology, vol.
Chen, "Rating scale, standard gamble, and time trade-off for people with traumatic spinal cord injuries," Phys Therapy, pp.
Caption: Figure 1: The user interface that UceWeb provides for eliciting utility coefficients using rating scale (a), time trade-off (b), and standard gamble ((c) with random smile arrangements and (d) with sequential arrangement).
A comparison of individual and social time trade-off values for health-states in the general population.
Modeling ranking, time trade-off, and visual analogue scale values for EQ-5D health states: A review and comparison of methods.
Estimating quality weights for EQ-5D health states with the time trade-off method in South Korea.