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Mean number of exacerbations by patient, per year
| FEV1 % predicted severity level | Population | |
|---|---|---|
| Requiring hospitalisation (severe) | Treated at home (mild) | |
| FEV1 % predicted, <40 | 2.61 | 2.64 |
| FEV1 % predicted, 40–69 | 1.36 | 1.97 |
| FEV1 % predicted, >70 | 0.86 | 2.18 |
FEV 1 % predicted percent predicted forced expiratory volume in 1 s
