FIGURE 3.

Features that survived the drop-column variable selection procedure for each GOLD group and model type (top: GOLD 0; bottom: GOLD 1–2). The mean ±1.96 × SD decrease in AUC related to dropping each feature is plotted only for features that significantly affected the model. Red bars indicate a higher risk of rapid FEV₁ decline with increasing value, having bronchodilator reversibility, African American race, and/or being a current smoker. Blue bars indicate a higher risk of rapid FEV₁ decline with decreasing value and male sex. Abbreviations: fev1.pp.post, post bronchodilator FEV₁% predicted; bdr, bronchodilator responsiveness; exp.ct.vol, CT-derived expiratory lung volume; sgrq, St. George’s Respiratory Questionnaire; tbv, total blood vessel volume; fev1.fvc.post, post bronchodilator FEV₁/FVC; walk.dist, 6-min walk distance; prm.lower.fsad, PRM lower lobes fSAD > 10%; cortical.T12, average HU value in the cortical region of the T12 vertebra; prm.upper.emphysema, PRM upper lobes emphysema > 2%; t.bv5, ratio of vascular tree length in vessels with a cross-sectional area less than 5 mm² to total vascular tree volume.