Trend of lipid and thyroid function tests in adults without overt thyroid diseases: A cohort from Tehran thyroid study

ContextWhile the role of overt hypothyroidism in lipid disorders is clear, the association between dyslipidemia and subclinical thyroid diseases remains unclarified.ObjectiveTo examine lipid trends based on thyroid function over a 10-year period.DesignThis is a prospective population based cohort study.SettingGeneral community.Participants2383 euthyroid participants, as well as those with subclinical thyroid diseases, in all residents of district 13 of Tehran were examined. Subjects who were on levothyroxine, anti-hyperthyroid drugs, and glucocorticoids, those with a history of thyroid surgery or RAI and pregnant women were excluded.Main outcome measuresLipid trends in Model 1 were adjusted for age and follow up duration, and in Model 2 gender-specific multivariate adjustments were performed for thyroid status, diabetes mellitus, smoking status, education, BMI, lipid lowering medications, age and follow up duration by using generalized estimating equations.ResultsIn every four years of assessments, there were significant decreases in levels of all lipid parameters (all Ps ConclusionDuring a 10 year follow-up, decrescendo trends were observed in levels of total cholesterol, triglycerides, which were not be accounted for by the consumption of lipid lowering drugs and thyroid status.