Patient characteristics
| Patient characteristic | n=146 |
| Age (years) † | 40.6±15.1 |
| Sex (F/M) | 100/46 |
| Inhaled corticosteroid (BDP equivalent μg)* | 1600 (800–2000) |
| Long acting β-agonist, n (%) | 142 (97) |
| Theophylline, n (%) | 75 (51) |
| Maintenance oral steroids, n (%) | 47 (32) |
| FEV1 (L) % predicted† | 79±24 |
| FEV1 / FVC ratio %† | 69±13 |
| FeNO (ppb)* | 46 (21–89) |
| ICT prescription refill ratio (%)* | 89 (49–103) |