Fig. 1From: Heterogeneous burden of lung disease in smokers with borderline airflow obstructionBox plots demonstrating percent of predicted forced expiratory volume in 1 s (FEV1%), forced expiratory flow rate between 25 and 75% of forced vital capacity (FEF25–75%), percent emphysema, and functional small airways disease by parametric response mapping (fSAD) in the three groupsBack to article page