There is evidence goiter is expanding to parts of Brazil that more recently have been opened up for agriculture, with children in those areas being exposed to low levels of supplementary iodine in the salt used for cooking. We found an increased risk of goiter in areas with deficient iodine supplementation (< 10 mg/kg) (odds ratio = 1.85; Cornfield 95% confidence interval: 1.68-2.03).
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