Generation | Supine | Standing | Generation | Supine | Standing |
FEV1 | Â | Â | RV | Â | Â |
 Trachea | 0.19 | 0.03 |  Trachea | 0.11 | 0.28 |
 Main bronchus | 0.18 | – 0.20 |  Main bronchus | 0.40** | 0.44** |
 3rd | 0.15 | – 0.13 |  3rd | 0.50** | 0.42** |
 4th | 0.04 | – 0.03 |  4th | 0.36* | 0.30* |
 5th | 0.09 | – 0.07 |  5th | 0.35* | 0.33* |
 6th | 0.12 | – 0.01 |  6th | 0.37** | 0.44** |
%FEV1 | Â | Â | %RV | Â | Â |
 Trachea | 0.11 | – 0.10 |  Trachea | – 0.01 | 0.19 |
 Main bronchus | – 0.08 | – 0.39* |  Main bronchus | 0.15 | 0.34* |
 3rd | – 0.10 | – 0.28 |  3rd | 0.33* | 0.40** |
 4th | 0.15 | – 0.15 |  4th | 0.29* | 0.29* |
 5th | – 0.06 | – 0.12 |  5th | 0.25 | 0.35* |
 6th | – 0.02 | – 0.12 |   6th | 0.29* | 0.39** |
 |  |  | IC/TLC |  |  |
 |  |  |  Trachea | – 0.04 | – 0.18 |
 |  |  |  Main bronchus | – 0.004 | – 0.19 |
 |  |  |  3rd | – 0.26 | – 0.37** |
 |  |  |  4th | – 0.23 | – 0.33** |
 |  |  |  5th | – 0.16 | – 0.37** |
 |  |  |  6th | – 0.23 | – 0.38** |