Effects of Low-level Lead Exposure on Children's Intelligence with Multiple Factors Analysys

To evaluate the effects of low-level lead exposure on children's intelligence,148 children(8~12 years old)who live on smeltery、lysine plant and suburb in Nanning were examined blood lead concentration(pbB),intelligence quotient(WIS'IQ)and other factors of intelligence.From the data,the avarage pbB level of all objects was 0.4002μmol/L.With t-test and multiple analysis of covariance,it indicated the verbal IQ(VIQ),performance IQ(PIQ)and full-scale IQ(FIQ)of the relatively high lead(pbB>0.4357μmol/L)group were lower than that of relativly low lead(pbB<0.3666μmol/L)group.But no signifi ant difference was observed.By stepwise regression analysis,the result showed that lead level would only play a minor role in affecting VIQ of children under the lead exposure level in this study,and this pb-related disadvantage of intelligence would be concealed by other factors after 15 objects whose pbB>0.48μmol/L had excepted from sample.