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为探讨交通铅污染对儿童智商的影响，选取交通要道附近学校在校五年（级）学生为观察组，取教学条件相近，非交通要道的同年（级）学生作对照．检测校园大气铅含量、学生血铅负荷、智商和影响因素．结果表明，观察组校园大气铅含量超过国家标准１．７倍，学生血铅负荷≥１．４μｍｏｌ／Ｌ，智商明显低于对照组；对照组校园大气铅在国家标准范围内，学生血铅平均值为０．９５μｍｏｌ／Ｌ。通过逐步回归分析筛选出血铅负荷等９个影响学生智商的因素，应用线性模型方法控制混杂因素后，仍显示血铅对智商的影响。
In order to explore the impact of lead pollution on children’s IQ, five-year school-level students in the vicinity of the traffic thoroughfare were selected as the observation group. Students taking the similar teaching conditions and non-traffic routes were selected as the control. Testing campus atmosphere lead content, student blood lead load, IQ, and influencing factors. The results showed that the lead concentration in the observation group was 1.7 times higher than that of the national standard, the blood lead load of students was ≥1.4μmol / L, the IQ was significantly lower than that of the control group, and that of the control group was within the national standard. The value is 0.95 μmol / L. By means of stepwise regression analysis, nine factors influencing students’ IQ, such as the lead load of hemorrhage, were screened out. After the confounding factors were controlled by the linear model, the effect of blood lead on IQ was still displayed.