Background
Methods
Study sample
Indirect and direct assessment of preferences for health states
Adjustment for end-aversion bias
Transformation of VAS scores to utility scores
Function number | Equation | Reference |
---|---|---|
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 = V0.56
| Furlong et al.[55] |
8 | U = V0.47
| Furlong et al.[55] and Le Gales et al.[56] |
HUI2 and HUI3
Statistical analysis
Results
Respondents
Assessment A | N | Mean | SD | Median | Min. | Max. | |
---|---|---|---|---|---|---|---|
Unadjusted
|
SG1
1
| 308 | 0.79 | 0.18 | 0.85 | 0.08 | 1.00 |
SG2
| 308 | 0.86 | 0.16 | 0.93 | 0.11 | 1.00 | |
SG3
| 308 | 0.87 | 0.15 | 0.93 | 0.11 | 1.00 | |
SG4
| 308 | 0.88 | 0.15 | 0.94 | 0.12 | 1.00 | |
SG5
| 308 | 0.90 | 0.14 | 0.96 | 0.13 | 1.00 | |
SG6
| 308 | 0.91 | 0.13 | 0.97 | 0.14 | 1.00 | |
SG7
| 308 | 0.77 | 0.15 | 0.81 | 0.18 | 0.99 | |
SG8
| 308 | 0.80 | 0.13 | 0.84 | 0.24 | 1.00 | |
Adjusted
|
SG1
| 308 | 0.84 | 0.18 | 0.92 | 0.09 | 1.00 |
SG2
| 308 | 0.90 | 0.15 | 0.97 | 0.12 | 1.00 | |
SG3
| 308 | 0.91 | 0.14 | 0.97 | 0.13 | 1.00 | |
SG4
| 308 | 0.91 | 0.14 | 0.98 | 0.13 | 1.00 | |
SG5
| 308 | 0.93 | 0.13 | 0.99 | 0.15 | 1.00 | |
SG6
| 308 | 0.93 | 0.12 | 0.99 | 0.16 | 1.00 | |
SG7
| 308 | 0.82 | 0.15 | 0.88 | 0.19 | 1.00 | |
SG8
| 308 | 0.85 | 0.13 | 0.90 | 0.26 | 1.00 | |
HUI2
| 307 | 0.72 | 0.19 | 0.75 | 0.12 | 1.00 | |
HUI3
| 306 | 0.66 | 0.21 | 0.68 | 0.14 | 1.00 |
Individual level agreement between direct and indirect utilities
SG utility | HUI2 | HUI3 | |||||
---|---|---|---|---|---|---|---|
Assessment A
|
r
|
ICC
|
95% CI
|
r
|
ICC
|
95% CI
| |
Unadjusted
|
SG1
| 60% | 0.57 | 0.49 to 0.64 | 60% | 0.60 | 0.52 to 0.66 |
SG2
| 55% | 0.54 | 0.46 to 0.62 | 58% | 0.56 | 0.47 to 0.63 | |
SG3
| 55% | 0.54 | 0.45 to 0.61 | 58% | 0.55 | 0.47 to 0.62 | |
SG4
| 55% | 0.53 | 0.45 to 0.61 | 57% | 0.54 | 0.46 to 0.62 | |
SG5
| 54% | 0.51 | 0.42 to 0.59 | 56% | 0.52 | 0.43 to 0.60 | |
SG6
| 53% | 0.50 | 0.41 to 0.58 | 55% | 0.50 | 0.41 to 0.58 | |
SG7
| 58% | 0.60 | 0.48 to 0.63 | 62% | 0.58 | 0.49 to 0.68 | |
SG8
| 58% | 0.53 | 0.45 to 0.61 | 61% | 0.54 | 0.46 to 0.62 | |
Adjusted
|
SG1
| 55% | 0.55 | 0.47 to 0.62 | 58% | 0.57 | 0.49 to 0.64 |
SG2
| 53% | 0.51 | 0.42 to 0.59 | 55% | 0.52 | 0.43 to 0.60 | |
SG3
| 53% | 0.51 | 0.42 to 0.58 | 55% | 0.51 | 0.42 to 0.59 | |
SG4
| 52% | 0.50 | 0.41 to 0.58 | 55% | 0.50 | 0.41 to 0.58 | |
SG5
| 51% | 0.47 | 0.38 to 0.56 | 53% | 0.47 | 0.38 to 0.55 | |
SG6
| 50% | 0.45 | 0.36 to 0.54 | 52% | 0.45 | 0.35 to 0.53 | |
SG7
| 57% | 0.55 | 0.47 to 0.62 | 60% | 0.56 | 0.48 to 0.64 | |
SG8
| 57% | 0.53 | 0.44 to 0.60 | 60% | 0.53 | 0.44 to 0.61 |
Group level agreement between direct and indirect utilities
SG utility | HUI2 | HUI3 | |||||
---|---|---|---|---|---|---|---|
Assessment A | N | Mean Difference | 95% CI | N | Mean Difference | 95% CI | |
Unadjusted
|
SG1
| 303 | 0.07 | 0.05 to 0.09 | 302 | 0.13 | 0.11 to 0.15 |
SG2
| 303 | 0.14 | 0.12 to 0.16 | 302 | 0.20 | 0.18 to 0.22 | |
SG3
| 303 | 0.15 | 0.13 to 0.17 | 302 | 0.21 | 0.19 to 0.23 | |
SG4
| 303 | 0.16 | 0.14 to 0.18 | 302 | 0.22 | 0.20 to 0.24 | |
SG5
| 303 | 0.18 | 0.16 to 0.20 | 302 | 0.24 | 0.22 to 0.26 | |
SG6
| 303 | 0.19 | 0.17 to 0.21 | 302 | 0.25 | 0.23 to 0.27 | |
SG7
| 303 | 0.05 | 0.03 to 0.07 | 302 | 0.11 | 0.09 to 0.13 | |
SG8
| 303 | 0.09 | 0.07 to 0.11 | 302 | 0.15 | 0.13 to 0.17 | |
Adjusted
|
SG1
| 303 | 0.12 | 0.11 to 0.14 | 302 | 0.18 | 0.16 to 0.20 |
SG2
| 303 | 0.18 | 0.16 to 0.20 | 302 | 0.24 | 0.22 to 0.26 | |
SG3
| 303 | 0.19 | 0.17 to 0.21 | 302 | 0.25 | 0.23 to 0.27 | |
SG4
| 303 | 0.19 | 0.18 to 0.21 | 302 | 0.25 | 0.23 to 0.27 | |
SG5
| 303 | 0.21 | 0.19 to 0.23 | 302 | 0.27 | 0.25 to 0.29 | |
SG6
| 303 | 0.22 | 0.20 to 0.24 | 302 | 0.28 | 0.26 to 0.30 | |
SG7
| 303 | 0.10 | 0.08 to 0.12 | 302 | 0.16 | 0.14 to 0.18 | |
SG8
| 303 | 0.13 | 0.11 to 0.15 | 302 | 0.19 | 0.17 to 0.21 |