Predictors of COVID-19 severity: a systematic review and meta-analysis.

: The unpredictability of the progression of coronavirus disease 2019 (COVID-19) may be attributed to the low precision of the tools used to predict the prognosis of this disease. : To identify the predictors associated with poor clinical outcomes in patients with COVID-19. : Relevant articles from PubMed, Embase, Cochrane, and Web of Science were searched as of April 5, 2020.