The purpose of this study is to determine whether treating women, who are diagnosed with a mild imbalance of thyroid hormones during pregnancy, with thyroid hormone replacement affects their children's intellectual development at 5 years of age.
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Intellectual Function of Children at 5 Years of Age in Women Diagnosed With a) Subclinical Hypothyroidism or b) Hypothyroxinemia During the First Half of Pregnancy, or Death.
Timeframe: 60 months of age