CT measurement | Correlation coefficient (r) for spirometric measurement | |||||
| FEV1 | FEV1 (%predicted) | FEV1/FVC | FEF25-75% | FEF25-75% (%predicted) | Peak flow |
Mean tracheal CSA | 0.388 (P < 0.05) | 0.110 (NS) | 0.211 (NS) | 0.255 (NS) | 0.145 (NS) | 0.358 (P < 0.05) |
Minimum tracheal CSA | 0.770 (P < 0.0001) | 0.485 (P < 0.01) | 0.490 (P < 0.01) | 0.635 (P < 0.0001) | 0.556 (P < 0.01) | 0.748 (P < 0.0001) |
LAA% | −0.164 (NS) | −0.172 (NS) | −0.260 (NS) | −0.234 (NS) | −0.260 (NS) | −0.080 (NS) |