Figure 2
From: Stage-dependent association of BDNF and TGF-β1with lung function in stable COPD
Correlation of platelet-derived mediators BDNF, TGF-β1 and Serotonin in COPD patients and controls. Shown in the upper line are correlations between serum levels (ng/ml) of BDNF and TGF-β1 for all COPD patients and controls. The lower line shows correlations between serum levels (ng/ml) of BDNF and Serotonin for all COPD patients and controls. Each dot represents one patient; the line is the regression line calculated with SPSS (Chicago, Illinois, USA). Spearman’s rank correlation coefficient (r) and the significance of the correlation (p) are given in the graph.