Prevalence (%) of self reported asthma, use of asthma medication, coughing and smoking status in responders (n=65 717) and in non-responders (n=326). Nord-Trøndelag, Norway 1997
| Self reported symptoms and smoking habits | Responders (%) | Non-responders (%) | p Value |
|---|---|---|---|
| Ever asthma | 8.6 | 9.1 | 0.79 |
| Asthma medication | 8.0 | 9.5 | 0.52 |
| Coughing | 14.9 | 10.8 | 0.04 |
| Coughing with phlegm | 8.3 | 6.2 | 0.08 |
| Chronic bronchitis | 3.5 | 3.0 | 0.74 |
| Never smoker | 44.3 | 39.7 | 0.10 |
| Ex-smoker | 25.5 | 24.8 | 0.78 |
| Current smoker | 30.2 | 35.5 | 0.04 |
Prevalence in non-responders age adjusted by direct method standardisation (total study population as reference).