Attributes and levels included in the discrete choice model
| Treatment attribute | Levels |
| Impact on everyday life | Little impact on household activities and able to go for a short walk |
| Able to wash, dress and move around the house, but not able to walk outside | |
| Able to wash and dress, but little else; walking almost impossible | |
| Stay in bed and not able to do anything for myself | |
| Medical care | No need to see a doctor |
| Need to see a doctor | |
| Admitted to hospital | |
| Number of future attacks | Fewer attacks in the future |
| No change in the number of future attacks | |
| More attacks in the future | |
| Symptoms | |
| Breathlessness | No worse than usual |
| Cough and phlegm/spit | Worse than usual |
| Social impact | Much worse than usual |
| Sleep disturbance | |
| Impact on mood | |
| Speed of recovery | <1 week |
| 2 weeks | |
| ≥3 weeks |