NPPB and type 2 diabetes mellitus: The univariable analysis of NIDCM (T2DM+) patients showed that HbA1c level, together with log-transformed NT-proBNP level, was negatively associated with GRPS (r = − 0.380 and – 0.327, both p < 0.01), and positively associated with GCPS (r = 0.237 and 0.306, both p < 0.05) and GLPS (r = 0.493 and 0.338, both p < 0.001) (Fig. 4).