Fig. 2
From: Dysregulation of the endothelial nitric oxide pathway is associated with airway inflammation in COPD
Serum SDMA concentration in smoking controls and patients with COPD. Serum SDMA concentration was compared among smoking controls and patients with stable and exacerbated COPD (a, ANOVA) and between the onset and the recovery of an acute severe exacerbation (b; paired t-test). Correlation between serum SDMA concentration and sputum inflammatory cell count and neutrophil count was also analysed in patients with E-COPD (c and d, Pearson correlation). Control: smoking control subjects, S-COPD: stable COPD, E-COPD: exacerbation of COPD. **p < 0.01, ***p < 0.001 vs. Control. ##p < 0.01 vs. S-COPD, &p < 0.05 vs. Onset. Data are shown as mean and standard deviation