Prevalence (%) of reported respiratory symptoms
| Symptom question | Prevalence |
| Have you had an attack of shortness of breath that came on following strenuous activity at any time during the last 12 months? | 25.7 |
| Do you ever have trouble with breathing? | 19.5 |
| Have you had wheeze or whistling in your chest at any time in the last 12 months? | 24.0 |
| Do you usually cough during the day, or at night, during the winter, and do you usually cough like this for as much as 3 months of the year? | 9.3 |