The basic characteristics of the subjects
| Characteristic | No current cough n=2716 | Current acute daily cough n=199 | Current subacute daily cough n=126 | Current chronic daily cough n=267 | Current infrequent cough n=365 |
| Age, years | 47.6 (10.8) | 47.3 (10.7) | 47.7 (10.3) | 50.5 (10.1) | 48.4 (10.9) |
| Female gender, % | 82.2 | 87.9 | 86.5 | 83.1 | 81.0 |
| Body mass index, kg/m2 | 26.4 (5.0) | 27.2 (5.5) | 26.6 (4.6) | 27.7 (5.4) | 27.0 (5.0) |
| Current smokers, % | 6.6 | 8.0 | 7.9 | 8.2 | 7.1 |
| Ever smokers, % | 31.3 | 31.7 | 35.7 | 30.7 | 31.2 |
| Pack-years among ever smokers | 6.2 (8.8) | 6.5 (9.0) | 7.0 (9.9) | 8.6 (10.8) | 6.1 (8.6) |
| Family history of chronic cough, % | 31.4 | 41.3 | 51.6 | 49.6 | 47.7 |
| Moisture damage exposure, % | 23.2 | 30.7 | 32.5 | 36.7 | 32.3 |
| Pet ownership, % | 43.7 | 45.2 | 48.8 | 38.0 | 36.4 |
| Chronic rhinosinusitis, % | 10.7 | 17.6 | 31.0 | 40.1 | 26.8 |
| Current asthma, % | 7.3 | 12.1 | 22.2 | 35.6 | 23.0 |
| Oesophageal reflux disease, % | 10.8 | 8.5 | 15.9 | 24.3 | 18.4 |
| Somatic symptom score | 2.4 (1.9) | 3.0 (1.9) | 3.4 (2.4) | 4.0 (2.5) | 3.5 (2.3) |
Figures are percentages or means and SDs.