NPPB and diabetes mellitus: MIF levels in the nondiabetes STEMI group were positively correlated with Nt-pro-BNP at 24-72 h after admission (r = 0.298, P < 0.001), whereas MIF levels in patients with diabetes STEMI were not associated with Nt-pro-BNP (r = 0.072, P = 0.595).