Introduction
Coronavirus disease 2019 (COVID-19) started in December 2019 as a respiratory infection with epidemic potentials 1. Since the appearance of several cases in Wuhan, the virus has extended rapidly to different parts of China as well as to other countries. Most of COVID-19 infections has occurred through human-to-human contact in family homes and hospitals 2. The typical presentation of COVID-19 involves fever and cough, but some cases of COVID-19 may progress to acute respiratory failure, acute respiratory distress syndrome, metabolic acidosis, coagulopathy, and septic shock, which are associated with high mortality 3, 4. Early diagnosis, treatment and prognostic stratification of patients with COVID-19 are crucial. Neutrophil-to-lymphocyte ratio or N terminal pro B type natriuretic peptide (NT-proBNP) has been suggested to be risk factors for severe illness Patients 5. But this study ignore the many factors that influence patient outcome.
Despite the prevalence of COVID-19, few studies have evaluated the risk factors on outcome in patients. In fact, many factors are used in order to predict the severity and determine the prognosis of pneumonia6. Early identification of risk factors for severe illness facilitated appropriate supportive care and alleviate the shortage of medical resources.