Before adjustment, the proportion of indirect effects of GDM to the total effect of ALT on LGA was 5.3% (P < 0.05); In Model 2, the indirect effect of GDM accounted for 8.0% (P < 0.05) of the total effect of ALT on LGA; In Model 3, the indirect effect of GDM accounted for 8.1% (P < 0.05) of the total effect of ALT on LGA (Table 5). Here, GPT is linked to gestational diabetes.