As presented in Table 3, the stepwise linear regression analysis showed that when serum ZAG was considered as the dependent variable with group (control, NCAD, and CAD), age, gender (male and female), BMI, SBP, DBP, FBG, TC, TG, HDL-C, LDL-C, ALT, Cr, and urea as independent variables, the variables including group (β = −0.328, P < 0.001) and urea (β = 0.106, P=0.046) were the independent contributors to serum ZAG levels. This evidence concerns the gene GPT and coronary artery disorder.