The risk factors and related hospitalizations for cases with positive and negative COVID-19 tests: A case-control study.

Background: The aim of this study was to evaluate the risk factors for hospitalizations of cases with positive and negative COVID-19 tests.

Methods: In this case-control study, the case and control groups consisted of 292 COVID-19 patients and 296 non-COVID-19 patients. Patients who referred to a reference laboratory in Tehran (Iran) in March 2020 were selected and interviewed.