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为探讨环境中低浓度铅对儿童智商的影响，选择131名合肥市某小学四年级学生，以其发铅水平作为铅暴露指标，智商为效应指标。结果发现：131名儿童发铅值水平在0．05×10－6～8．35×10-6（均数上标准差为2．57×10－6±1．87±10-6，拟和智商（FIQ）水平在72～135（均数±标准差为105．27±12．68）。以3．5×10-6和1．5×10－6发铅值为分界线进行t检验，结果发现，发铅值在较低水平时（1．5×10－6）时，仍对智商有影响（P＜0．05）。控制11个对智商有影响的混杂因素后，经多元逐步回归分析，发铅值排在11个影响因素中的第2位。
To explore the impact of low concentration lead on children’s intelligence in the environment, 131 senior students from a certain primary school in Hefei were selected as lead exposure indicators and IQ as effect indicators. The results showed that the lead level of 131 children was 0.05 × 10-6 ~ 8.35 × 10-6 (the standard deviation of mean was 2.57 × 10-6 ± 1.87 ± 10-6, And FIQ levels ranged from 72 to 135 (mean ± standard deviation was 105.27 ± 12.68) .Thickness values of 3.5 × 10-6 and 1.5 × 10-6 were used as t (P <0.05) .After controlling 11 IQ-influencing confounders, the effect of IQ Multivariate stepwise regression analysis showed that lead was ranked second in the 11 influencing factors.