Table 1.
Prevalence of asthma and chronic obstructive pulmonary disease (COPD) according to clinical characteristics of patients with persistent cough. Values are mean (SD) unless indicated otherwise
| No asthma or COPD | Asthma | COPD | Total | |
|---|---|---|---|---|
| No (%) with diagnosis | 104 (54) | 74 (39) | 14 (7) | 192 |
| No (%) men | 46 (44) | 16 (22) | 10 (71) | 72 (38) |
| Age (years) | 42.1 (14.3) | 43.0 (17.3) | 64.1 (9.1) | 44.0 (16.2) |
| No (%) with symptoms in past year | 80 (77) | 74 (100) | 14 (100) | 168 (88) |
| Pack years of smoking | 6.2 (9.7) | 8.8 (10.4) | 26.9 (20.2) | 8.7 (12.1) |
| No (%) with PD20 ⩽15.6 μmol methacholine chloride | 4 (4) | 66 (89) | 4 (29) | 74 (42)* |
| % of predicted FEV1 | 100 (10) | 86 (17) | 54 (10) | 91 (18) |
| FEV1/FVC (%) | 82.8 (6.9) | 75.5 (9.8) | 66.8 (10.2) | 79.4 (9.3) |
| % of predicted change in FEV1 | 2.1 (3.2) | 7.5 (5.7) | 3.6 (2.9) | 3.7 (4.6) |
| No (%) with change in FEV1 ⩾9% of predicted | 0 | 22 (29.7) | 0 | 22 (11.5) |
*
Of 176 patients tested.