Patient characteristics of mild and severe asthma patients and healthy controls
| Healthy | Mild asthma | Severe asthma | |
| Subjects | 17 | 43 | 16 |
| Age years | 22.26 (19–31) | 21.36 (18–29) | 44.53 (25–66) |
| Sex ratio male:female | 0.13 | 0.47 | 0.44 |
| FEV1 pre-bronchodilator L | 4.17±0.70 | 4.10±0.69 | 2.72±0.72 |
| FEV1 post-bronchodilator L | 4.29±0.69 | 4.20±0.77 | 2.99±0.73 |
| FEV1 pre-bronchodilator % pred | 108.2±10.51 | 101.12±11.59 | 86.61±21.29 |
| FEV1 post-bronchodilator % pred | 111.6±10.58 | 107.96±11.67 | 94.76±21.43 |
| FEV1 reversibility | 3.4±2.60 | 6.84±4.47 | 8.23±4.91 |
| PC20 mg·mL−1 | >16.0 | 2.57±2.3 | 1.42±1.64 |
| FeNO ppb | 20.8±11.09 | 52.34±30.15 | 61.79±71.02 |
Data are presented as n, mean (range) or mean±sd. FEV1: forced expiratory volume in 1 s; PC20 provocative concentration causing a 20% fall in FEV1; FeNO: exhaled nitric oxide fraction.