Comparison of characteristics and CT indices between the BA group with airway obstruction (FEV1% predicted <80) and the group with mild and moderate COPD (FEV1% predicted ≥50)
| Characteristic | BA | COPD |
|---|---|---|
| N | 13 | 29 |
| Age (years) | 68 (43–83) | 72 (58–83) |
| Height (cm) | 158.7 (11.0) | 160.6 (7.3) |
| BSA (m2) | 1.59 (0.20) | 1.58 (0.11) |
| FEV1 (% predicted) | 75.8 (22.7) | 65.2 (13.8) |
| FEV1/FVC (%) | 68.1 (13.0) | 52.3 (8.9) |
| Ai/BSA (apical) | 8.7 (3.6)* | 13.6 (4.6) |
| WA% (apical) (%) | 66.6 (4.6)* | 60.5 (5.1) |
| Ai/BSA (basal) | 10.0 (4.9)* | 14.1 (3.6) |
| WA% (basal) (%) | 62.8 (7.1)* | 57.9 (5.1) |
| Mean Ri (mm) | 3.14 (0.14)* | 3.35 (0.09) |
| SD_Ri (mm) | 0.16 (0.054)* | 0.20 (0.042) |
| SD_Ri/√BSA | 0.13 (0.043)* | 0.16 (0.035) |
| CV_Ri | 0.053 (0.018) | 0.058 (0.015) |
Values are mean (SD) or median (range).
*Significantly different from the COPD group.
Ai, luminal area; BA, bronchial asthma; BSA, body surface area; Ri, radius of inscribed sphere in the airway lumen (see text); SD_Ri and CV_Ri, parameters for shape irregularity of the airway lumen (see text); WA%, percentage ratio of wall area to total airway area.