NPPB and diabetes mellitus: From a risk prediction perspective, conventional demographic and clinical indices were not strong surrogates for distinguishing low from normal cardiac ATP levels (Supplemental Table 2), with the caveat that diabetes (P = 0.03), ischemic etiology (P = 0.061), and higher NT-proBNP (P = 0.043) tended to be associated with lower ATP, as might be expected.