Table 1.
Characteristics of participants with self-reported doctor-diagnosed asthma. Data are presented as n (%) or median (IQR).
| Participants with doctor-diagnosed asthma | |
|---|---|
| Total | 496 |
| Age (years) | 60.0 (49.0–69.0) |
| Female | 304 (61.3) |
| BMI (kg/m2) | 27.3 (24.2–31.2) |
| Smoking* | |
| Current | 68 (13.8) |
| Ex | 165 (33.5) |
| Never | 260 (52.7) |
| Doctor-diagnosed COPD | 40 (8.1) |
| Doctor-diagnosed allergy to pollen or animals or both | 272 (54.8) |
| Asthma symptoms on allergen exposure | 212 (42.7) |
| Age at asthma diagnosis (years)** | 42 (27–55) |
| Age at onset of asthma symptoms (years)** | 35 (17–48) |
| Duration from onset of asthma symptoms to diagnosis (years)** | 3 (1–10) |
*3 participants excluded because of missing answer on smoking habits **74 participants excluded because of missing answer on either age at asthma diagnosis or onset of symptoms. BMI = body mass index. COPD = chronic obstructive pulmonary disease.