１９９０—１９９１年［１］作者对吉林省缺碘地区 ６个县市部分中心小学进行了智商值调查，参见表１。７年后为进一步了解儿童智商值的变化与食盐中碘浓度的关系，于１９９７年６月又从第一次调查中抽１个县４所乡中心小学做了追踪观察，现将结果报告如下。１对象与方法１１对 1990-1991 [1] The authors conducted an IQ survey of some of the six central counties in Jilin Province’s iodine-deficient areas. See Table 1. After 7 years, to further understand the relationship between changes in children’s IQ and iodine concentrations in salt, In June 1997, from the first survey, 1 county 4 township primary schools were followed up. The results are reported as follows. 1 objects and methods 11 pairs