Mean (SD) LAA% of each lung site in 73 patients with COPD
| i-LAA% | o-LAA% | |
|---|---|---|
| Total (T) | 39.1 (18.5)2-150 | 28.1 (13.2) |
| Upper (U) | 42.0 (23.7)2-150 | 31.9 (18.7) |
| Middle (M) | 34.1 (20.7)2-150 | 26.3 (14.8) |
| Lower (L) | 40.1 (19.8)2-150 | 25.9 (13.8) |
LAA% = percentage ratio of low attenuation area to the lung area; i = inner segment; o = outer segment.
↵2-150 p<0.0001 compared with the corresponding o-LAA%.