Demographic characters and laboratory parameters
The cohort consisted of 239 patients,140 patients met discharge criteria (58.6%) and 99(41.4%) patients eventually returned to death (%).Among the patients, 122(51%) were male and 117(49%) were female. The median age was 57 (39, 71) years. 107 patients were aged ≥60 years (44.8%). Patients were divided into the improvement group and death groups according to their final outcomes. The majority of patients had low and moderate fever, while the remaining patients had high or no fever. A higher proportion of patients in the improvement group came to the hospital within 6 days of the onset of symptoms, as opposed to patients in the death group, who took longer than 6 days from symptom onset to treatment. The mean age of patients in the death group was significantly higher than that in the improvement group(70.00±13.53 vs.47.47±16.83 ,p<0.001). Patients in the death group had higher rates of upper respiratory symptoms(coughing ,  runny nose, and sneezing), dyspnea, headache, muscle pain, gastrointestinal symptoms(vomiting and diarrhea), and comorbidities. There were statistically significant differences in hypertension, diabetes and coronary heart disease among the comorbidients. Among clinical symptoms, there were statistically significant differences in upper respiratory tract symptoms and dyspnea. The proportion of male in death group was higher than that in the improvement group, and the difference was statistically significant. All data of patients with demographic characters, clinical symptoms and comorbidities were summarized in Table1.