GPT and gestational diabetes: Multivariable restricted cubic spline regression analyses showed linear associations between most liver biomarkers and GDM risk (Supplementary Figures 3–8), but a non-linear shape between ALT and 2-h PBG (Pnon-linear =0.003; Supplementary Figure 3), and a J-shape relationships of AST/ALT ratio with 1-h PBG and 2-h PBG (Pnon-linear =0.006 for 1-h PBG; Pnon-linear =0.011 for 2-h PBG, respectively; Supplementary Figure 7).