| Patients |
All | FEV1 ≥80 %pred |
Age of asthma onset ≥15 yr | 0.8 (0.4–1.3) | 0.9 (0.4–1.6) |
Duration of asthma ≥18 yr | 1.0 (0.6–1.5) | 0.8 (0.3–1.4) |
Atopy | 0.9 (0.5–1.5) | 0.9 (0.4–1.5) |
PC20 histamine ≤1 mg·mL−1 | 0.6 (0.3–1.3) | 0.6 (0.2–1.5) |
Blood eosinophils ≥0.45×109 | 1.3 (0.7–2.0) | 2.0 (0.9–2.6) |
Sputum eosinophils ≥2% | 1.6 (0.8–2.5) | 2.0 (0.8–2.8) |
FeNO ≥20 ppb | 1.9 (1.1–2.6) | 3.1 (1.7–3.4) |