Fig. 2From: Optimal cut points of N-terminal of the prohormone brain natriuretic peptide (NT-proBNP) in patients with COVID-19Kaplan–Meier curve of the cumulative survival rate of patients with COVID-19 categorized into three groups based on NT-proBNP cut points. Red line is for NT-proBNP ≤ 331; green line is for 331 < NT-proBNP ≤ 11,121; Blue line is for NT-proBNP > 11,121Back to article page