Distribution of those tested for asthma according to sex, age and smoking habits
| Symptom group | Sex | Age (years) | Smoking habits | |||||||
| Male | Female | 65–74 | ⩾75 | Never smoked | Ex-smoker | Current smoker | Missing | |||
| Previous doctor diagnosed asthma | 17 | 17 | 25 | 9 | 10 | 19 | 5 | – | ||
| Symptom group 1 | 92 | 62 | 97 | 57 | 42 | 78 | 29 | 5 | ||
| Symptom group 2 | 12 | 3 | 9 | 6 | 4 | 8 | 3 | – | ||
| Symptom group 3 | 9 | 10 | 15 | 4 | 8 | 9 | 1 | 1 | ||
| Symptom group 4 | 5 | 4 | 5 | 4 | 3 | 6 | – | – | ||
| Symptom group 5 | 31 | 18 | 30 | 19 | 18 | 22 | 8 | 1 | ||
| Total | 166 | 114 | 181 | 99 | 85 | 142 | 46 | 7 | ||