Table 6

Correlation between CT indices and spirometry in the BA group

FVC (% predicted)FEV1 (% predicted)FEV1/FVCFEF25–75%
Ai/BSA (apical)
WA% (apical) (%)
Ai/BSA (basal)0.51‡0.55‡0.49‡
WA% (basal) (%)−0.50‡−0.57‡−0.46†
Mean Ri (mm)
SD_Ri (mm)
  • − not significant, †p<0.05, ‡p<0.01.Ai, luminal area; BA, bronchial asthma; BSA, body surface area; FEF25–75%, mean forced expiratory flow between 25% and 75% of FVC; 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.