Table 4– Multivariable models predicting emphysema and airway variables
Parameter estimate95% CIp-value
Emphysema
 Radiologist score of emphysema severity
  Biomass group-1.555-2.466– -0.6430.001
  Age0.035-0.032–0.1010.299
  FEV1 % pred-0.024-0.054–0.0070.121
  Height0.026-0.053–0.1050.513
 %LAA <950 HU at inspiratory scan
  Biomass group-7.397-14.657– -0.1360.046
  Age-0.177-0.731–0.3770.521
  FEV1 % pred-0.242-0.486–0.0020.052
  Height0.201-0.407–0.8090.507
 Size of emphysematous spaces (D)
  Biomass group0.4570.137–0.7770.006
  Age-0.008-0.032–0.0170.530
  FEV1 % pred0.0120.001–0.0220.036
  Height-0.012-0.039–0.0150.373
Airways disease
 Radiologist score of air trapping severity
  Biomass group0.8680.135–1.6010.022
  Age-0.034-0.087–0.0190.200
  FEV1 % pred-0.012-0.037–0.0130.322
  Height-0.025-0.089–0.0380.421
 %LAA <856 HU at expiratory scan
  Biomass group-0.952-12.006–10.1020.863
  Age0.053-0.774–0.8800.898
  FEV1 % pred-0.006-0.367–0.3540.972
  Height0.256-0.661–1.1730.575
 Square root of wall area at lumen perimeter=10 mm
  Biomass group0.099-0.155–0.3540.435
  Age-0.006-0.026–0.0130.528
  FEV1 % pred-0.003-0.011–0.0060.490
  Height-0.007-0.028–0.0150.522
 Airway wall area percentage
  Biomass group0.504-2.171–3.1800.705
  Age-0.061-0.266–0.1430.546
  FEV1 % pred0.025-0.065–0.1150.581
  Height-0.119-0.343–0.1050.289
 CT lung density ratio
  Biomass group-0.100-0.220–0.0270.121
  Age-0.002-0.011–0.0080.718
  FEV1 % pred0.002-0.002–0.0060.412
  Height0.0100.000–0.0210.047
  • FEV1: forced expiratory volume in 1 s; %LAA: % low attenuation area; CT: computed tomography.