TABLE 2.
Baseline characteristics of the total population and differences among COPD and non-COPD patients
| Conceptual domain | Total population | COPD | No COPD | p-value |
| Age years | 55 (49–61) | 58 (54–64) | 54 (47–60) | <0.001 |
| Males | 229 (49) | 66 (68.8) | 163 (43.9) | <0.001 |
| Body mass index kg·m−2 | 28 (24–33) | 26 (22–29.5) | 28 (24–33) | 0.002 |
| Wheezing | ||||
| Any wheezing | 228 (48.7) | 53 (55.2) | 175 (47) | 0.15 |
| Without infection | 163 (34.8) | 37 (38.5) | 126 (33.9) | 0.39 |
| Cough | ||||
| For 3 months | 186 (39.7) | 53 (55.2) | 133 (35.8) | 0.001 |
| Chronic cough | 153 (32.8) | 46 (47.9) | 107 (28.8) | <0.001 |
| Phlegm | ||||
| For 3 months | 186 (39.8) | 48 (50) | 138 (37.2) | 0.022 |
| Chronic phlegm | 136 (29.1) | 39 (40.6) | 97 (26.1) | 0.005 |
| Dyspnoea | 253 (54.1) | 60 (62.5) | 193 (51.9) | 0.063 |
| History of smoking | ||||
| Current smokers | 333 (71.2) | 60 (62.5) | 273 (73.4) | 0.036 |
| Smoking history pack-years | 30 (20–40) | 40 (25–50) | 28 (18.38–40) | <0.001 |
| Environment | ||||
| Fireplace | 38 (8.1) | 10 (10.4) | 28 (7.5) | 0.35 |
| Profession at risk | 88 (18.8) | 19 (19.8) | 69 (18.5) | 0.78 |
Data are presented as median (25th–75th percentile) or n (%), unless otherwise stated. COPD: chronic obstructive pulmonary disease.