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Association between prognostic factors and intensive care unit (ICU) admission among coronavirus disease 2019 (COVID-19) cases within the hospital setting. Odds ratios (ORs) (95% confidence intervals (CIs)), I2 test for heterogeneity, absolute risk differences (95% CIs) and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) assessment are presented for all studies. COPD: chronic obstructive pulmonary disease; N (n): number of studies (number of population).
