| GOLD stages post salbutamol | O | I | II | III | IV | ||||
| N | 10 | 10 | 10 | 10 | 10 | ||||
| VAS | 27 (18) | 30 (26) | 34 (37) | 53 (19) | 48 (24) | ||||
| IC%pred | 115 (22) | 105 (20) | 101 (17) | 71 (16)*** | 64 (15)*** | ||||
| OC (%pred) | 108 (17) | 100 (15) | 91 (20) | – | – | ||||
| IC-OC (L) | 0.70 (0.8) | 0.52 (0.5) | 0.42 (0.4) | – | – | ||||
| ΔN2/L (%pred) | 118 (63) | 271 (174) | 390 (171)** | 573) (134)*** | 849 (344)*** | ||||
| PaO2 (mm Hg) | 89 (13) | 87 (10) | 81 (10) | 75 (8)** | 78 (9) |
Values are mean (SD). p<*0.05, **0.01, ***0.001 relative to stage O.