Fig. 4From: An integrated metabo-lipidomics profile of induced sputum for the identification of novel biomarkers in the differential diagnosis of asthma and COPDBox plot analysis of main discriminant compounds. Box plot of the peak intensities for the four statistically upregulated compounds in COPD patients compared to asthmatics. The p-values were calculated by Student t-test and the asterisks show the level of significance between the two groups; * p-values < 0.05. Box plot analysis was performed by OriginLab® softwareBack to article page