Survival Rates and Prognostic Factors in Patients with Coronavirus Disease 2019: A Registry-Based Retrospective Cohort Study

Background: coronavirus disease 2019 (covid-19) is a contagious disease caused by a newlyidentified coronavirus. our knowledge about the survival rate and prognostic factors of the diseaseis not established well. therefore, this study aimed to identify the risk factors associated with thesurvival of covid-19 cases in hamadan province, west of iran.study design: a retrospective cohort studymethods: this retrospective cohort study was performed in hamadan province, west of iran. thestudy included patients that referred to the provincial hospitals from february 20 to september 20,2020. the follow-up of each subject was calculated from the date of onset of respiratory symptomsto the date of death. demographic and clinical characteristics were extracted from patients’ medicalrecords. kaplan-meier method, flemington-harrington test, and cox regression were used for dataanalysis.results: the overall 1, 5, 10, 20, 30 and 49-day survival rates were estimated at 99.57%, 95.61%,91.15%, 87.34%, 86.91%, and 86.74%, respectively. furthermore, survival time showed asignificant association with age, gender, history of traveling to contaminated areas, co-morbidity,neoplasms, chronic diseases, and hospital units.conclusions: in conclusion, elderly people, male gender, and comorbidities presented a greaterrisk of death. therefore, it is important to pay more attention to this group of people to reduce theincidence and consequences after infection.