Fig.1 Flow chart of the study. PSM:propensity score matching
COVID-19 diagnostic criteria
COVID-19 were ascertained through the utilization of real-time reverse
transcription polymerase chain reaction on nasal and pharyngeal swabs
(Ct<35). Clinical diagnosis and typing were conducted in adherence to
the guidelines outlined in the Diagnosis and treatment protocol for
COVID-19 (9th edition) [10].