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The CSA and PA/A of COPD patients with different severity
| Groups | Cases | CSA (%) | PA/A |
|---|---|---|---|
| Mild group | 41 | 0.68 ± 0.12 | 0.83 ± 0.29 |
| Moderate group | 45 | 0.62 ± 0.15 | 0.88 ± 0.25 |
| Severe group | 42 | 0.55 ± 0.13 | 0.94 ± 0.30 |
| p | 0.013 | 0.009 |
CSA, cross-sectional area; PA/A, the ratio of pulmonary artery and aorta
