| Group 1: (ACBT) Mean (SD) | Group 2: (NIV and ACBT) Mean (SD) | |
| Age | 62 (9) | 61 (14) |
| FEV1 %pred | 36 (10) | 39 (12) |
| Paco2 mm Hg | 5 (1) | 5 (1) |
| Pao2 mm Hg | 10 (3) | 9 (2) |
| Sao2 % | 89 (9) | 93 (4) |
| PIMax cmH2O | 63 (29) | 56 (30) |
| PEMax cmH2O | 84 (35) | 73 (31) |
| Duration “normal” airway clearance (mins) | 15 (4) | 18 (9) |