| Mild (n = 56) | Moderate (n = 94) | Severe (n = 28) | Very severe (n = 5) | |||||
| Ever smoker (n = 38) (%) | Never smoker (n = 18) (%) | Ever smoker (n = 70) (%) | Never smoker (n = 24) (%) | Ever smoker (n = 24) (%) | Never smoker (n = 4) (%) | Ever smoker (n = 3) (%) | Never smoker (n = 2) (%) | |
| No symptoms | 13 (34.2) | 12 (66.7) | 23 (32.9) | 7 (29.2) | 4 (16.7) | 1 (25.0) | 0 (0) | 0 (0) |
| Cough | 19 (50.0) | 1 (5.6) | 30 (42.9) | 11 (45.8) | 17 (70.8) | 3 (75.0) | 3 (100) | 2 (100) |
| Phlegm | 12 (31.6) | 1 (5.6) | 27 (38.6) | 5 (20.8) | 18 (75.0) | 2 (50.0) | 3 (100) | 2 (100) |
| Dyspnoea | 18 (47.4) | 6 (50.0) | 32 (45.7) | 12 (50.0) | 23 (95.8) | 3 (75.0) | 3 (100) | 2 (100) |
COPD, chronic obstructive pulmonary disease.