Missing data were identified randomly in several clinical variables as follows: urine albumin (n = 1) in T1D; CPR (n = 1), CPI (n = 1), glucagon (n = 1), P-amylase (n = 1), lipase (n = 1) and urine albumin (n = 6) in patients with T2D. Here, GCG is linked to type 2 diabetes mellitus.