Mean (SD) per patient healthcare costs over 2 years
| Severe asthma (n = 808) | Mild/moderate asthma (n = 3975) | Non-asthma controls (rhinitis only) (n = 1994) | |
| Prescribed medicines (Mean) | £3447 | £972 | £514 |
| (SD) | £5606 | £1619 | £1178 |
| Activity- Low cost (Mean) | £4229 | £2606 | £2131 |
| (SD) | £4296 | £3267 | £2807 |
| Total – Low cost (Mean) | £7676 | £3578 | £2645 |
| (SD) | £7490 | £3899 | £3254 |
| Activity – High cost (Mean) | £5085 | £3051 | £2474 |
| (SD) | £5364 | £4225 | £3529 |
| Total – High cost (Mean) | £8533 | £4023 | £2988 |
| (SD) | £8206 | £4791 | £3924 |