Role of peripheral eosinophilia in acute exacerbation of chronic obstructive pulmonary disease

Figure 1 The Kaplan-Meier curves of time to first chronic obstructive pulmonary disease related readmission (P < 0. 001; adjusted hazard ratio = 1.488, 95% confidence interval = 1.195-1.854). Log-rank method was used to test the difference between the two groups. COPD: Chronic obstructive pulmonary disease; EOS: Patients with eosinophil count ≥ 2%; Non-EOS: Patients with eosinophil count < 2%.

Figure 2 The correlation between the percentage of eosinophils and the number of readmissions within 12 mo (P < 0. 001; Pearson's r = 0.147). The relationships between continuous variables were assessed by the Pearson's correlation coefficient (r) and simple linear regression analysis.

Figure 3 The correlation between the percentage of eosinophils and the length of stay (d) in the index hospitalization (P = 0. 031; Pearson's r = -0.086). The relationships between continuous variables are assessed by the Pearson's correlation coefficient (r) and simple linear regression analysis.