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- W2806644304 abstract "Most studies of thyroid function changes during pregnancy use a cross-sectional design comparing means between groups rather than similarities within groups.Latent class growth analysis (LCGA) is a novel approach to investigate longitudinal changes that provide dynamic understanding of the relationship between thyroid status and advancing pregnancy.Prospective observational study with repeated assessments.General community.Eleven hundred healthy women were included at 12 weeks' gestation.The existence of both free T4 (fT4) and TSH trajectories throughout pregnancy determined by LCGA.LCGA revealed three trajectory classes. Class 1 (n = 1019; 92.4%), a low increasing TSH reference group, had a gradual increase in TSH throughout gestation (from 1.1 to 1.3 IU/L). Class 2 (n = 30; 2.8%), a high increasing TSH group, displayed the largest increase in TSH (from 1.9 to 3.3 IU/L). Class 3 (n = 51; 4.6%), a decreasing TSH group, had the largest fall in TSH (from 3.2 to 2.4 IU/L). Subclinical hypothyroidism at 12 weeks occurred in up to 60% of class 3 women and was accompanied by elevated thyroid peroxidase antibodies (TPO-Ab) titers (50%) and a parental history of thyroid dysfunction (23%). In class 2, 70% of women were nulliparous compared with 46% in class 1 and 49% in class 3.LCGA revealed distinct trajectories of longitudinal changes in fT4 and TSH levels during pregnancy in 7.4% of women. These trajectories were correlated with parity and TPO-Ab status and followed patterns that might reflect differences in pregnancy-specific immune tolerance between nulliparous and multiparous women." @default.
- W2806644304 created "2018-06-13" @default.
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- W2806644304 date "2018-05-28" @default.
- W2806644304 modified "2023-10-10" @default.
- W2806644304 title "Longitudinal Trajectories of Gestational Thyroid Function: A New Approach to Better Understand Changes in Thyroid Function" @default.
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- W2806644304 doi "https://doi.org/10.1210/jc.2017-02556" @default.
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