Circulating eosinophil counts (percentages and absolute values) in the study population
| ECOPD patients | Control patients | p-value | |
| Subjects | 318 | 674 | |
| Eosinophils % | 2.8±1.5 | 2.9±1.7 | 0.284 |
| Eosinophils cells·μL−1 | 235.6±143 | 233.2±139 | 0.809 |
| Eosinophils ≥2% | 226 (72) | 478 (70.9) | 0.929 |
| Eosinophils ≥4% | 47 (14.8) | 135 (20) | 0.053 |
| Eosinophils ≥300 cells·μL−1 | 47 (14.8) | 229 (33.9) | <0.001 |
Data are presented as n, mean±sd or n (%), unless otherwise stated. ECOPD: exacerbations of chronic obstructive pulmonary disease.