**Figure 2.** The adjusted hazard ratio for ALT (**A**), AST (**B**) and the De Ritis ratio (**C**) for postoperative 90-day mortality. Solid lines indicate the hazard ratio according to ALT, AST, and De Ritis ratio splines with medians (19 IU/L for ALT, 22 IU/L for AST and 1.18 for the De Ritis ratio) as a reference. The shaded area represents the 95% confidence interval. Dots indicate the hazard ratio according to ALT, AST, and De Ritis ratio groups. Error bars represent the 95% confidence intervals. SI conversion factors: To convert ALT and AST to μkat/L, multiply values by 0.0167. ALT: alanine aminotransferase; AST: aspartate aminotransferase; CI: confidence interval.