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20 0 1年 ,WHO、UNICEF、ICCIDD提出了依据学龄儿童尿碘评价碘营养状态的流行病学标准〔1〕。根据此标准 ,人群尿碘中位数 (MUI)在 50～ 99μg/L定义为轻度碘缺乏 ,MUI大于 30 0μg/L定义为碘过量。碘摄入过量可以使儿童甲状腺肿和儿童甲状腺功能减退症的患病率增加〔2 ,3〕。
In 2001, WHO, UNICEF and ICCIDD proposed epidemiological criteria for assessing iodine nutrition status based on urinary iodine of school-age children [1]. According to this standard, the population median urinary iodine (MUI) at 50 ~ 99μg / L is defined as mild iodine deficiency, MUI greater than 30 0μg / L is defined as iodine excess. Excessive iodine intake can increase the prevalence of goiter and hypothyroidism in children [2,3].