Figure 3
From: Stage-dependent association of BDNF and TGF-β1with lung function in stable COPD
Correlation of serum BDNF and TGF-β1 with FEV1 (forced exspiratory volume in 1 second) in patients with COPD. Shown in the left column are correlations between serum levels of BDNF (ng/ml) and FEV1 for all COPD patients (A) and patients with COPD stage GOLD III (C). The right column shows correlations between serum levels of TGF-β1 (ng/ml) and FEV1 for all COPD patients (B) and patients with COPD stage GOLD III (D). 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.