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Table 4 Relationship between functional variables and visual CT-scores of emphysema by multivariate linear regression model with stepwise selection

From: Computer quantification of airway collapse on forced expiration to predict the presence of emphysema

Variables Partial R2value Model R2value p value
1.    
 AC, degrees 0.5032 0.5032 <.0001
 FEV1/FVC 0.0211 0.5244 <.0001
2.    
 AC, degrees 0.5056 0.5056 <.0001
 KCO, %predicted 0.1137 0.6193 <.0001
 FEV1, %predicted 0.0067 0.6260 0.0040
  1. 1/ Variables of spirometry (initial model: AC, FVC,%pred, FEV1,%pred, FEV1/FVC); 2/ Variables of spirometry and diffusion capacity (initial model: AC, FVC,%pred, FEV1,%pred, FEV1/FVC, DL,CO,%pred, KCO,%pred).