Fig. 7From: An integrated metabo-lipidomics profile of induced sputum for the identification of novel biomarkers in the differential diagnosis of asthma and COPDSpearman correlation analysis between compounds and lung function parameters. Each panel shows the most significant metabolites and lipids correlated to FEV1(%) (A), FVC(%) (B) and FEV1/FVC (C). The x-axis indicates the Spearman’s correlation coefficient and the y-axis indicates the significance of the correlation (− log10 of the p-value)Back to article page