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对不同水碘含量（１００～６００ μｇ／ Ｌ）的１６５ 名８～１２ 岁儿童进行了食碘盐前后甲状腺肿、尿碘和智商的观察，结果食碘盐１２ 个月后甲状腺肿大率明显升高，尤其是水碘在６８０ μｇ／ Ｌ的，已达２１４３％ 。但从１４７ 名儿童的尿碘与智商分析看，尿碘在６００ μｇ／ Ｌ以上者低于平均智商，认为高碘区儿童尿碘在６００μｇ／ Ｌ以下者食碘盐可提高智商，６００ μｇ／ Ｌ以上者不宜食用。
The results of goiter, urinary iodine and IQ of 165 children aged 8-12 years with different water iodine (100-600 μg / L) before and after iodized salt diet showed that the incidence of goiter was significantly higher after 12 months of iodized salt intake Increased, especially with water iodine at 680 μg / L, has reached 21 43%. However, from the analysis of urinary iodine and IQ of 147 children, the urinary iodine above 600 μg / L is lower than the average IQ. It is considered that children with iodine iodine below 600 μg / L can improve their IQ by using iodine 600 μg / L above should not eat.