Table 1 Different power functions reported for transforming VAS values (V) to SG utilities (U)*

1

U = 1-(1-V)^1.6

Torrance et al.[51]

2

U = 1-(1-V)^2.2

Wolfson et al.[52]

3

U = 1-(1-V)^2.3

Torrance et al.[3]

4

U = 1-(1-V)^2.4

Feeny et al.[53]

5

U = 1-(1-V)^2.7

Krabbe et al.[54]

6

U = 1-(1-V)^2.9

Feeny et al.[53]

7

U = V^0.56

Furlong et al.[55]

8

U = V^0.47

Furlong et al.[55] and Le Gales et al.[56]