Fig. 4

The predictive power for AECOPD and length of hospital stay. The predictive power for AECOPD and hospital stay duration was analyzed through receiver operating characteristic curves for different predictive biomarkers at admission. (A) The predictive power of plasma 4-HNE, IL-6, CRP, neutrophil count and PCT for AECOPD was analyzed. (B) The predictive power of plasma 4-HNE, IL-6, CRP, neutrophil count and PCT for hospital stay was analyzed.