Table 3– Chest computed tomography scan features of subjects with chronic obstructive pulmonary disease (COPD) and asthma compared to those with COPD alone
COPDCOPD and asthmaEffect sizep-value
Log emphysema# %1.91±1.41.44±1.6-0.23±0.07<0.001
Pi10 mm3.71±0.143.78±0.160.06±0.01<0.001
Segmental airway wall area %62.8±3.063.6±3.30.61±0.16<0.001
Subsegmental airway wall area %65.6±2.366.4±2.70.66±0.200.001
Gas trapping %39.7±20.735.6±21.50.88±1.50.55
  • Data are presented as mean±sd, unless otherwise stated. Effect size data are presented as β±se for the COPD and asthma group. Regression models were adjusted for age, sex, pack-years, body mass index and type of computed tomography scanner. Pi10: square root of wall area of a 10-mm luminal perimeter. #: additionally adjusted for current smoking status; : additionally adjusted for clinical centre.