| Â | N | Mean (SD) | Median (IQR) | Observed range | Possible range* |
|---|
EQ-5D
| 131 | 0.8 (0.2) | 0.8 (0.7 - 1.0) | −0.1 - 1.0 | −0.6 – 1.0 |
SF-6D
| 126 | 0.7 (0.1) | 0.7 (0.6 - 0.9) | 0.4 - 0.9 | 0.3 – 1.0 |
TTO
| 123 | 0.9 (0.2) | 1.0 (0.8 - 1.0) | 0.2 - 1.0 | 0 – 1.0 |
VFQ-25
| 132 | 72.9 (22.1) | 81.1 (57.8 - 91.6) | 17.1 - 99.4 | 0 – 100 |
- * Higher values indicate better health.
- EQ-5D = UVs derived using EuroQoL Index tool. UK population norms (n = 1763) by age group are the following, mean (SD) 45–54: 0.85 (0.25); 55–64: 0.80 (0.26); 65–74: 0.78 (0.26); 75+: 0.73 (0.27) [52].
- SF-6D = UVs derived from SF-36 using SF-6D algorithm [53].
- TTO = time trade-off utility value.
- VFQ-25 = 25-item national eye institute visual function questionnaire.
