GPT and type 2 diabetes mellitus: BMI: body mass index, WC: waist circumference, T2D: type 2 diabetes, MS: metabolic syndrome, HDL-C: high-density lipoprotein cholesterol, LDL-C: low-density lipoprotein cholesterol, AST: aspartate aminotransferase, ALT: alanine aminotransferase, GGT: gamma-glutamyl transferase.