补锌对城市低年级学龄儿童智商及学习成绩的影响

Effects of zinc Supplementation on intelligence quotient and class test marks in school children

将１０８名（男４８，女６０）７～８岁儿童随机等分为性别组成一致的三组，以随机双盲法进行三种为期７０天的补锌治疗试验：锌２０ｍｇ（７）、锌２０ｍｇ＋微量营养素（ＺＭ）、微量营养素（Ｍ）。结果表明，补锌能显著提高受试儿童智商（ＩＱ）和学习成绩，同时补充微量营养素促进作用更明显。提示：参试部分儿童中存在着不同程度的锌缺乏，并因此使智能发育受到损伤。

children (48 boys and 60 girls) from a city primary school in Qingdao, ages 7 to 8 years, were studied. The subjects were randomly assigned in same numbers by sex to three 70 days treatments: zinc 20mg/d plus micronutrients(ZM), micronutrients without zinc(M),or zinc 20mg/d without micronutrients(Z), and treated double-blind. Intelligence quotient(IQ) of the subjects were measured before and after the treatments. And marks of term-end examinations were also collected and compared with preceding ones. The trial showed IQ of the children from ZM and Z groups increased significantly,but less in M group. All the three groups had lower marks in the examination than in last one because of increased question difficulties,but the largest dropping occurred in M group. The subjects given ZM lost least. The findings show that some of children are zinc deficient and their intelligence development are impaired by zinc depletion.