GPT and metabolic syndrome: NAFLD-LFS = −2.89 + 1.18 × metabolic syndrome (yes = 1, no = 0) + 0.45 × type 2 diabetes (yes = 2, no = 0) + 0.15 × insulin (mU/L) + 0.04 × AST (U/L) −0.94 × AST/ALT