Key points are not available for this paper at this time.
Lead is a confirmed neurotoxin, but questions remain about lead-associated intellectual deficits at blood lead levels or = 7.5 microg/dL (p = 0.015). We conclude that environmental lead exposure in children who have maximal blood lead levels < 7.5 microg/dL is associated with intellectual deficits.
Lanphear et al. (Sat,) studied this question.