Sensitivity and specificity of COPD-6
| Standard comparator | Parameter | Cut-off | Sensitivity % | Specificity % | AUC (SE) |
| Standard spirometer | FEV1/FEV6 | 0.75 | 78 | 88 | 0.893 (0.032) |
| Clinical diagnosis | FEV1/FEV6 (COPD-6) | 0.8 | 84 | 83 | 0.886 (0.033) |
| FEV1/FEV6 (COPD-6) | 0.75 | 71 | 88 | ||
| FEV1/FVC(standered spirometer) | 0.70 | 83 | 70 | 0.801 (0.062) | |
| FEV1 reversibility by standard | FEV1 change | 12% and 200 ml | 79 | 86 | 0.828 (0.049) |