Elevated serum lead levels in childhood are associated with lower IQ, hyperactivity, aggression, poor growth, diminished academic

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Elevated serum lead levels in childhood are associated with lower IQ, hyperactivity, aggression, poor growth, diminished academic performance, increased delinquency, seizures, and even death. The neurological damage that occurs cannot be reversed, even once exposure is stopped.

Why might this independent variable be difficult to measure?

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