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为探讨接触低水平铅是否对儿童智能发育产生影响，根据血铅值将儿童分为低血铅组（血铅＜１０μｇ／ｄｌ）和高血铅组（血铅≥１０μｇ／ｄｌ），比较两组之间婴幼儿智能发育和学龄前儿童智力测验结果是否有差异。结果高血铅组儿童的ＰＤＩ、ＶＩＱ、ＰＩＱ和ＦＩＱ高于低血铅组。单因素分析提示血铅与ＣＤＣＣ量表中的心理运动发育指数（ＰＤＩ）以及ＷＰＰＳＩ量表中的语言智商（ＶＩＱ）、操作智商（ＰＩＱ）和总智商（ＦＩＱ）存在负相关关系，ｒ分别为－０．１４５８，－０．３３３０，－０．２３１６，－０．３１３３；高血铅组高于低血铅组。但多元回归分析显示血铅值与智能发育无相关关系，表明铅可能是阻碍儿童智能发育的一个危险因素。但当血铅水平不太高时（血铅值不高于２５μｇ／ｄｌ）的相关关系不明显。
To explore whether exposure to low levels of lead has an impact on the development of children’s intelligence, children were divided into low blood lead (blood lead <10μg / dl) and high blood lead (blood lead≥10μg / dl) Is there any difference between the intelligence development of infants and young children and preschool children’s intelligence test? Results The PDI, VIQ, PIQ and FIQ in high blood lead group were higher than those in low blood lead group. Univariate analysis showed that there was a negative correlation between blood lead level and psychological movement index (PDI) in CDCC scale and language IQ (VIQ), PIQ and FIQ in WPPSI scale, r -0.1458, -0.3330, -0.2316, -0.3133; high blood lead group was higher than low blood lead group. However, multivariate regression analysis showed that there was no correlation between blood lead levels and intelligence development, indicating that lead may be a risk factor impeding the intellectual development of children. However, when the blood lead level is not too high (blood lead value is not higher than 25μg / dl) the correlation is not obvious.