Quality of life data across each GOLD stage4
| GOLD stage | Patient number | CAT median (IQR) | Patient number | SGRQ median (IQR) |
| FEV1/FVC>0.7 | 9 | 12 (6–21) | 9 | 27.1 (9.7–48.0) |
| 1 | 13 | 15 (9–21) | 12 | 33.4 (19.3–35.7) |
| 2 | 63 | 16 (12–21) | 63 | 41.5 (30.9–55.4) |
| 3 | 39 | 19 (11–25) | 39 | 48.8 (36.5–67.3) |
| 4 | 53 | 20 (13.5–27) | 33 | 62.0 (36.5–67.3) |
The number of patients for each Global Strategy for Obstructive Lung Disease (GOLD) stage is shown together with the median and IQR data for the CAT and SGRQ total score.
CAT, COPD assessment tool; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St George’s Respiratory Questionnaire.