Representation of selected factors achieved by purposive sampling#
| BTS step 2/3 | BTS step 4/5 | Total | Data missing | |
| Sex | ||||
| Male | 7 | 10 | 17 | |
| Female | 15 | 10 | 25 | |
| ACT score | 2 | |||
| Poor (<20) | 15 | 15 | 30 | |
| Good (≥20) | 7 | 3 | 10 | |
| HADS score | 4 | |||
| Borderline or in clinical range (≥8) | 9 | 11 | 20 | |
| Normal (<8) | 11 | 7 | 18 | |
| Household income | 19 | |||
| National average or below | 6 | 5 | 11 | |
| Above national average | 9 | 3 | 12 | |
| Age years | 3 | |||
| ≤40 | 6 | 7 | 13 | |
| >40 | 15 | 11 | 26 |
Data are presented as n. BTS: British Thoracic Society; ACT: Asthma Control Test; HADS: Hospital Anxiety and Depression Scale. #: adequate representation defined as minimum of n=3 per cell.