Characteristics of patients
| Sex (female/male) | 15/4 |
| Age (years) | 38 (7), (24–49) |
| FEV1 (l) | 2.88 (0.66), (1.74–3.98) |
| FEV1 (% predicted) | 88.4 (16.1), (63–111) |
| PC20 methacholine (mg/ml) | 0.62 (0.06–4.30) |
| PD30+ methacholine (mg) | 0.77 (0.18–3.18) |
| Inhaled steroid dose (μg/day) | 500 (400–1600) |
Values are presented as absolute numbers or as mean (SD), (range) except PC20, PD30+, and steroid dose where a median (range) is given.
FEV1 = forced expiratory volume in 1 second; PC20 = provocative concentration of methacholine causing a decrease in FEV1 of 20%; PD30+ = provocative dose of methacholine causing decrease in FEV1 of ⩾30%.