GPT and chronic kidney disease: Compared to “AST/ALT ratio ≥ 1 and non-elevated GGT”, “AST/ALT ratio < 1 and elevated GGT” (OR: 2.73, 95% CI: 2.36–3.15) and “AST/ALT ratio ≥ 1 and elevated GGT” (2.33, 1.98–2.75) were significantly associated with CKD.