Correlation coefficients (r values) between the LAA% and pulmonary function tests in 73 patients with COPD
| Pulmonary function | T-LAA% | T-i-LAA% | T-o-LAA% |
|---|---|---|---|
| VC (l) | NS | NS | NS |
| TLC (l) | 0.5263-150 | 0.5343-150 | 0.4933-150 |
| RV/TLC (%) | 0.4913-150 | 0.4813-150 | 0.4833-150 |
| FEV1(l) | −0.4923-150 | −0.4883-150 | −0.4773-150 |
| FEV1/FVC (%) | −0.6223-150 | −0.6153-150 | −0.6043-150 |
| Tlco/VA (mmol/min/kPa /l) | −0.6323-150 | −0.6373-150 | −0.6003-150 |
LAA% = percentage ratio of low attenuation area to the lung area; i = inner segment; o = outer segment; T = total three sections; U = upper lung; M = middle lung; L = lower lung; NS = not significant; VC = vital capacity; TLC = total lung capacity; RV = residual volume; FEV1 = forced expiratory volume in one second; FVC = forced vital capacity; Tlco = carbon monoxide transfer factor; VA = alveolar volume.
↵3-150 p<0.0001.