Figure legends
Figure 1. Study consort diagram.
Figure 2. Hazard ratios (HR) and 95% confidence intervals (CI) of remission rates of COPD patients with eosinophilic or non-eosinophilic acute exacerbation (≥ 2% vs <2%). COPD: chronic obstructive pulmonary disease: (a ) Overall analysis of all ages; (b ) Subgroup analysis of elderly patients; (c ) Subgroup analysis of middle-aged patients.