Levels of thyroid function were defined
as euthyroidism (normal functioning)(thyroid - stimulating hormone [TSH], 0.45 - 4.49 mIU / L), subclinical hyperthyroidism (TSH < 0.45 mIU / L), and subclinical hypothyroidism (TSH ≥ 4.50 - 19.99 mIU / L) with normal thyroxine (a hormone that is made by the thyroid gland) concentrations.