Receiver operating characteristic curves to identify estimates of EQ-5D-5L that best identified achievement of the minimum important difference of the anchor, giving equal weighting to sensitivity and specificity
| Anchor | Cut-point | Sensitivity (%) | Specificity (%) | AUC | p Value |
|---|---|---|---|---|---|
| Utility index | |||||
| CRQ emotion | 0.046 | 66.3 | 66.5 | 0.72 | <0.001 |
| CRQ mastery | 0.038 | 63.5 | 63.7 | 0.66 | <0.001 |
| CRQ total | 0.037 | 65.6 | 66.4 | 0.69 | <0.001 |
| EQ-VAS | |||||
| CRQ dyspnoea | 6.5 | 70.0 | 62.0 | 0.69 | <0.001 |
| CRQ fatigue | 6.5 | 56.1 | 66.1 | 0.65 | <0.001 |
| CRQ emotion | 6.5 | 61.5 | 68.0 | 0.68 | <0.001 |
| CRQ mastery | 6.5 | 58.5 | 67.9 | 0.66 | <0.001 |
| CRQ total | 6.5 | 59.1 | 69.8 | 0.67 | <0.001 |
AUC, area under curve or C-statistic; CRQ, chronic respiratory questionnaire.