| Risk factors | Score |
| Age years | |
| ≥70 | 8 |
| 60–69 | 4 |
| <60 | 0 |
| Recent respiratory hospitalisation | |
| Yes | 14 |
| No | 0 |
| Baseline FVC % predicted | |
| ≤50 | 18 |
| 51–65 | 13 |
| 66–79 | 8 |
| ≥80 | 0 |
| 24-week change in FVC % predicted | |
| ≤ -10 | 21 |
| -5 to -9.9 | 10 |
| > -4.9 | 0 |
FVC: forced vital capacity. Sum the individual scores corresponding to the level of each risk factor for a given patient, e.g. the total score for a patient aged 70 years, with no history of respiratory hospitalisation, FVC 51–65% predicted, and a 24-week change in FVC of -5 to -9.9% predicted is 8+0+13+10=31. Reproduced with modification from [21] with permission from the publisher.