NPPB and type 2 diabetes mellitus: After adjusting for age, sex, body mass index (BMI), log N-terminal pro-B type natriuretic peptide (log NT-proBNP), left ventricular ejection fraction (LVEF), hemoglobin, renal function, coronary heart disease and hypertension, the peak VO2 was lower in the T2DM group compared to the non-T2DM group with a mean difference (MD) of −2.0 ml/kg/min [95% confidence interval (CI), −3.18 to −0.82, P < 0.01].