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本实验对某铅作业工厂的子校学生进行了智力发育的调查。根据其父母接触铅的程度分为实验一组（父母双方均接触铅或有一方接触铅）、实验二组（父母不接触铅）及对照组３个组，调查总数为１８３名。结果表明：实验一、二组学生血铅（ＰｂＢ）值增高，其智商有降低趋势。父母接触组学生低智商检出率较高（Ｐ＜０．０５）。母亲为铅作业者的学生智商显著低于对照组（Ｐ＜０．０５）。当ＰｂＢ≥０．９７μｍｏｌ／Ｌ时，智商有降低趋势。经逐步回归分析表明铅是影响智商的因素之一。
In this experiment, we investigated the mental development of the children in a lead factory. According to the extent of their parents’ exposure to lead, they were divided into experimental group (lead and lead on both sides or lead on one side), experimental group 2 (lead not exposed to lead) and control group. The total number of investigations was 183. The results showed that the level of blood lead (PbB) increased in the first and second groups, and the IQ decreased. The detection rate of low IQ in Parents-exposed group was higher (P <0.05). The IQ of mothers with lead was significantly lower than that of controls (P <0.05). When PbB ≥ 0.97μmol / L, IQ decreased. Stepwise regression analysis shows that lead is one of the factors that affect IQ.