2.2 Diagnostic criteria
Diagnostic and discharge criteria were based on The Diagnosis and Treatment Protocol for COVID-19 (Trial Version 8) issued by the National Health Commission and the State Administration of TCM [1].
2.3 Inclusion Criteria
We included patients (1) that fulfilled diagnostic criteria for COVID-19, (2) were aged 18 years or older, and (3) had complete inpatient medical records at the Chongqing Three Gorges Central Hospital.