Patient characteristics
| Patients | 15 |
| Male/female | 8/7 |
| Age (years) | 44.7±10.9 |
| Ethnicity (Caucasian/South-East Asian/mixed) | 13/1/1 |
| Never-smokers/ex-smokers | 12/3 |
| ICS prescribed (%) | 53 |
| Pre-BD FEV1 % predicted | 91.9±12.6 |
| Pre-BD FEV1/FVC ratio | 71.7±6.7 |
Data are presented as n or mean±sd, unless otherwise stated. ICS: inhaled corticosteroid; BD: bronchodilator; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity.