Table 2.
Characteristics of participants with allergic (self-report of allergy to pollen and/or animals and asthma symptoms on allergen exposure) and non-allergic (self-report of no allergy to pollen or animals or asthma symptoms on allergen exposure) asthma. Data are presented as n (%) or median (IQR).
| Allergic asthma | Non-allergic asthma | p-value | |
|---|---|---|---|
| Total | 212 (42.7) | 284 (57.3) | |
| Age (years) | 54 (41–65) | 63 (54–71) | <0.001 |
| Female | 135 (63.7) | 169 (59.5) | 0.35 |
| BMI (kg/m2) | 27.0 (23.9–31.6) | 27.5 (24.7–30.9) | 0.61 |
| Smoking* | |||
| Ever | 87 (41.4) | 146 (51.6) | 0.025 |
| Never | 123 (58.6) | 137 (48.4) | |
| Doctor-diagnosed COPD | 6 (2.8) | 34 (12.0) | <0.001 |
| Age at asthma diagnosis** | 31 (17–46) | 49 (37.75–58) | <0.001 |
| Age at onset of asthma symptoms** | 20 (9.25–40) | 40.5 (30–50) | <0.001 |
| Duration from onset of symptoms to diagnosis** | 4 (1–10) | 3 (1–10) | 0.58 |
*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.