Figure 3

Figure 3

 Relationship between relative sputum neutrophil counts and lung function measurements of (A) airflow obstruction (FEV1 % predicted: r = −0.54, p<0.001), (B) gas trapping (RV/TLC: r = 0.56, p<0.001) and (C) the expiratory/inspiratory (E/I) ratio (r = 0.54, p<0.001).