In the subgroup analysis (Fig. 2), there were no significant interactions in age, gender, diabetes mellitus, or BMI, with overall P-values of 0.501, 0.073, 0.141, and 0.832, respectively; except for AST or ALT level and hepatitis virus (Pinteraction = 0.028 and Pinteraction < 0.001, respectively). Here, GPT is linked to diabetes mellitus.