Fig. 1

Flow chart describing the schema of the study population. Primary outcomes included mortality and intubation analysis. Secondary outcomes included length of stay, chest pain incidence, heart rate, history of deep vein thrombosis or PE, and comparison of admission laboratory parameters (ferritin, C-reactive protein [CRP], d-dimer fibrinogen equivalent units [FEU], and d-dimer units [DDU], fibrinogen, lactate dehydrogenase [LDH], and lymphocyte count). Separate propensity score matched analysis was performed for each lab parameter