Bellinger D C, Needleman H L
J Pediatr. 1983 Apr;102(4):523-7. doi: 10.1016/s0022-3476(83)80178-4.
Using regression analysis, we show that the IQs of children with elevated levels of dentine lead (greater than 20 parts per million) are below those expected, based on their mothers' IQs. Moreover, the amount by which a child's IQ falls short of the expected value increases with increasing levels of dentine lead in what may be a nonlinear fashion. Although lead level contributed nothing to the prediction of IQ for children with low levels of dentine lead (less than 10 parts per million), it rivaled maternal IQ in importance as a predictor in the group with elevated lead values. Thus for schoolchildren with lead burdens in the highest decile of the distribution for the urban area we sampled, the usual relationship between maternal and child IQ appears to be disrupted in a manner systematically related to lead levels in dentine.
通过回归分析，我们发现，牙质铅含量升高（超过百万分之20）的儿童，其智商低于基于其母亲智商所预期的水平。此外，儿童智商低于预期值的程度随着牙质铅含量的增加而增加，且可能呈非线性关系。虽然对于牙质铅含量低（低于百万分之10）的儿童，铅含量对智商预测没有贡献，但在铅含量升高的儿童组中，它作为预测指标的重要性可与母亲的智商相媲美。因此，对于我们所抽样的市区铅负荷处于分布最高十分位数的学童来说，母亲和孩子智商之间的通常关系似乎以一种与牙质铅含量系统相关的方式被破坏了。
