AVP and hypothyroidism: Firstly, socioeconomic (eg, educational level, occupation) and environmental factors, as well as biochemistry and endocrine parameters (eg, serum electrolyte, thyroid hormones/antibodies, and ADH), were not available in the NHIRD [35], thus it was unable to evaluate the severity of hypothyroidism or hyponatremia according to serum sodium, T3, T4, free T4, and thyroid-stimulating hormone levels.