Figure 1. Clinical characteristics of eosinophil and LDH in COVID-19 patients with chronic airway inflammation. (A) Eosinophil counts in different subgroups. Eosinophil counts were significantly decreased in severe COVID-19 patients with chronic bronchitis and COPD; (B) LDH levels in different subgroups. LDH levels were significantly decreased in severe COVID-19 patients with chronic bronchitis and COPD. Values of non-severe and severe patients were presented with open and closed circles, respectively. Mann-Whitney U test was used. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001.