Table 6 The mean values of each independent outcome measure within each stage of the new SAFE Index.
| SAFE Index | ||||
|---|---|---|---|---|
| Stage I | Stage II | Stage III | Stage IV | |
| Mean FEV1%Pred | 66.85 (5.34) | 45.01 (2.94) | 35.45 (3.51) | 30.09 (3.76) |
| Mean 6MWD | 405.0 (18.7) | 341.5 (8.6) | 324.5 (16.2) | 232.7 (15.8) |
| Mean SGRQ total score | 19.4 (2.5) | 30.6 (2.3) | 51.4 (3.3) | 71.9 (2.9) |
| Mean 2 year exacerbation | 0.25 (0.11) | 0.65 (0.15) | 1.52 (0.26) | 2.36 (0.49) |
FEV1%Pred, percentage of predicted forced expiratory volume in 1 s; 6MWD, 6 min walk distance; SGRQ, St George's Respiratory Questionnaire.