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Risk of miscarriage associated with the level of TSH in pregnant women who received levothyroxine for at least 6 months before conception. aThe P-value compares data from subjects with TSH >2.5 μIU/mL with the reference range of 0.2–2.5 μIU/mL. Data were adjusted for age, year of pregnancy, diabetes during or before pregnancy, and social class. Drawn from data presented in reference 40.
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