Fig. 6From: Dual polarization of human alveolar macrophages progressively increases with smoking and COPD severityRelationship between M1 alveolar macrophages and lung function. Correlation between percentage of M1 (iNOS+) alveolar macrophages and FEV1/FVC (%) in all the subjects of the study, excluding donors who did not have lung function. Spearman rank correlation r = −0.67 and p < 0.0001Back to article page