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In comparison to other counties, Essex county has the largest number of children above the CDC blood lead level, 5% of Essex county children are affected.  They surpassed Passaic County's 3.4%.  This risk is more prominent in Essex county than any other group in the state.

This study addresses vulnerable populations because it explains that high blood levels, which is a sign of poverty, can have an impact on performance in testing.  Even though information was not given pertaining to poverty in each subject, these conclusions can be drawn from other studies.