Comparison of CT parameters between the three groups
| Parameter | BA | COPD | Control |
|---|---|---|---|
| Ai/BSA (apical) | 9.4 (3.4)*† | 13.3 (5.5) | 12.0 (3.9) |
| WA% (apical) (%) | 65.6 (6.2)*† | 61.1 (5.9) | 58.0 (6.0) |
| Ai/BSA (basal) | 10.7 (4.3)† | 13.3 (4.2) | 12.7 (3.7) |
| WA% (basal) (%) | 62.1 (7.5)*† | 58.9 (5.7) | 56.7 (5.5) |
| Mean Ri (mm) | 2.94 (0.64)*† | 3.38 (0.46) | 3.25 (0.46) |
| SD_Ri (mm) | 0.16 (0.057) | 0.22 (0.044)*‡ | 0.17 (0.046) |
| SD_Ri/√BSA | 0.13 (0.046) | 0.17 (0.035)*‡ | 0.14 (0.037) |
| CV_Ri | 0.057 (0.021) | 0.065 (0.017)* | 0.054 (0.015) |
Values are mean (SD).
*Significantly different from the control group.
†Significantly different from the COPD group.
‡Significantly different from the BA 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.