Figure 2. In‐hospital mortality stratified by HF diagnosis and NT‐proBNP elevation.

A, The percentage of patients with in‐hospital mortality stratified by previous HF diagnosis (no HF: n=3829) and known HF (n=846), which was analyzed by Kruskal‐Wallis χ² test for normal vs elevated NT‐proBNP (no HF: normal NT‐proBNP, n=3030; elevated NT‐proBNP, n=799; HF: normal NT‐proBNP, n=301; elevated NT‐proBNP, n=545). B, The percentage of patients with in‐hospital mortality stratified by previous HF diagnosis (no HF: n=3829) and known heart failure (n=846), analyzed by χ² test for the overall difference between quintiles (no HF: each quintile, n=766; HF: each quintile, n=169). ***P<0.001. HF indicates heart failure; and NT‐proBNP, N‐terminal pro‐B‐type natriuretic peptide.