The effects of gestational hypothyroxinemia on the neurointellectual prognosis of children in the first year of life living in an industrial city (megalopolis) with mild iodine deficiency were studied in 13 children of mothers with thyroid hormone-corrected gestational hypothyroxinemia in the first trimester and 10 children of mothers with normal levels of free thyroxine by assessing cognitive functions at ages six, nine, and 12 months using the Gnome mental development scale. The results showed that maternal free thyroxine levels at the early stages (5-9 weeks) of pregnancy correlated significantly with the coefficients of mental development among the children at ages 6, 9, and 12 months, i.e.
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