NPPB and type 2 diabetes mellitus: This finding is consistent with previous studies that have reported an association between the duration of T2DM and elevated NT-proBNP levels [22,23]. Among the study subjects with normal NT-proBNP levels, 162 (71.1) had HbA1c levels between 6.5-9.5%, whereas among those with elevated NT-proBNP levels, 66 (28.9%) had HbA1c levels between 6.5-9.5%.