Table 4 Known-group validity of four health utility approaches
Groups | N (%) | TTO | SG | AQoL-7D | VFQ-UI | ||||
|---|---|---|---|---|---|---|---|---|---|
Mean (SD) | P-value | Mean (SD) | P-value | Mean (SD) | P-value | Mean (SD) | P-value | ||
Severity of myopia | |||||||||
 Low | 138 (28.9) | 0.95 (0.05) | 0.761 | 0.94 (0.12) | 0.278 | 0.81 (0.11) | 0.200 | 0.85 (0.09) | 0.001 |
 Moderate to High | 339 (71.1) | 0.95 (0.06) |  | 0.95 (0.09) |  | 0.80 (0.11) |  | 0.83 (0.10) |  |
Duration of myopia (Years) | |||||||||
  ≤ 10 | 301 (63.1) | 0.95 (0.05) | 0.053 | 0.95 (0.10) | 0.423 | 0.81 (0.10) | 0.269 | 0.83 (0.10) | 0.000 |
  > 10 | 176 (36.9) | 0.94 (0.07) |  | 0.95 (0.10) |  | 0.79 (0.12) |  | 0.79 (0.12) |  |
Wear corrective devices | |||||||||
 Yes | 436 (91.4) | 0.95 (0.06) | 0.796 | 0.95 (0.10) | 0.169 | 0.80 (0.11) | 0.810 | 0.84 (0.10) | 0.617 |
 No | 41 (8.6) | 0.95 (0.06) |  | 0.94 (0.09) |  | 0.80 (0.12) |  | 0.82 (0.12) |  |