This is study is evidence of nothing. Bruce Lanphear is a long-time lead scare profiteer.
Read USA today coverage of Lanphear’s junk.
This is more meaningless weak association epidemiology, the problems with which are explained by the cream of the epidemiologist crop — i.e., Bradford Hill and Ernst Wynder.
Lanphear’s abstract is below. The study is here and here.
I first wrote about Lanphear for FOXNews.com in 2001. Same guy. Same sort of junk science.