中文摘要：

目的评估食盐加碘对学龄儿童的智力改善情况。方法2006年和2010年均采用中国联合型瑞文测验第二次修订版（CRT-C2）对甘肃省临夏回族自治州（临夏州）8个县（市）3518名和1611名8-10岁儿童智力进行测试。结果2006年儿童平均智商为85．1，IQ≤69比例为16．7％；各县（市）儿童平均智商为80～90，差异有统计学意义（P〈0．05）；8、9和10岁儿童平均智商分别为92．0，90．6和81．8，10岁组低于其他两组8～10个IQ值，差异有统计学意义（P〈0．05）；男女童智商平均值分别为84．5和85．6，差异无统计学意义。2010年儿童平均智商为97.2，比2006年提高12个IQ，差异有统计学意义（P〈0．05），但低于同期全省平均水平（105个IQ值），差异有统计学意义（P〈0．05），IQ≤69的比例为4．7％；临夏市和永靖县儿童均达到100个IQ值的理论水平，其他县（市）儿童平均智商约为95个10值，差异有统计学意义；8、9和10岁儿童平均智商分别为96．3，97．1和98．4，年龄别差异无统计学意义（P〉0．05），男女童智商平均值分别为98．8和95．9，差异有统计学意义（P〈0．05）。结论随着全民食盐加碘措施逐步落实，临夏州儿童平均智商接近理论水平，碘盐对儿童智力发育起到关键性作用，但2010年儿童智商仍然低于甘肃省同期水平，且各县（市）儿童平均智商有明显差异。

英文摘要：

Objective To assess the improvement of intelligence quotient through an Universal Salt Iodization Supply Program, among children. Methods 3518 and 1611 children were selected from primary schools in Linxia Hui Autonomous Prefecture of Gansu in 2006 and 2010 respectively. Intelligence quotient （IQ） were measured by the revised Chinese Combined Raven Test-C2 （CRT-C2）. Results In 2006, the average IQ of children aged 8-10 was 85.1, including 16.7% of them with IQ~〈69. The average IQ was between 80-90 in different counties and cities, with significant differences （P〈0.05）. The average IQs were 92.0,90.6 and 81.8 among 8,9 and l0 years old children respectively with 10 year old＇ s low than those 8 and 9 year olds （P〈0.05）. The average IQs of boys and girls were 84.5 and 85.6, but with no significant difference （P 〉0.05）. The average IQ of children aged 8-10 in 2010 was 97.2 and 12 points higher than in 2006 （P〈0.05）, but 8 IQ points （P〈0.05） less than the average level 105 from the overall of Gansu province. 4.7% of the children having an IQ~69. IQ of children from Linxia city and Yongjing county, were up to the theoretical level of 100, with an average IQ at around 95 in other counties. The average IQs between counties or cities showed significant differences. The IQ of 8, 9 year olds and 10 year olds did not present significant difference （P〉0.05） , but in boys （98.8） and in girls （95.9） the difference was significant （P〈0.05）. Conclusion The average IQ was close to the theoretical level （100） with the gradual implementation of universal salt iodization program, showing that the iodized salt did play a key role on children＇s intelligence. However, the average IQ was still lower than the average level of the whole Gansu province in 2010.