In the comparison of participants with and without anxiety disorders, significant differences were identified in the levels of T4 (median of 108.47 nmol/L vs. 116.78 nmol/L, P=0.005), free triiodothyronine (FT3) (median of 4.87 pmol/L vs. 4.97 pmol/L, P=0.036), and thyroglobulin antibody (TGAb) (median of 0.00 IU/mL vs. 0.10 IU/mL, P=0.002). This evidence concerns the gene TG and anxiety disorder.