We further explored effects of serum Glu and INS on incidence of GDM in both groups (Table 5), and found serum Glu were significantly associated with incidence of GDM in both endometriosis group (aOR 12.95, 95% CI 1.69–99.42; P = 0.014) and control group (aOR 4.15, 95% CI 1.50–11.53; P = 0.006). The gene discussed is INS; the disease is endometriosis.