Except for the iodine intake, age (β = 0.06, p = 0.0035), gender (B = -2.34, p<0.0001), positive TgAb (β = 0.17, p<0.05), goiter (β = -0.16, p<0.0001), abnormal TSH (β = -0.15, p<0.0001), and personal history of thyroid diseases (β = -0.06, p = 0.0070) were all associated with the serum Tg level. Here, TG is linked to thyroid gland disorder.