TLDR: 400,000 annual US deaths are attributed to lead poisoning, 10x increases over previous estimates. The difference is due to previous studies excluding low

TLDR: 400,000 annual US deaths are attributed to lead poisoning, 10x increases over previous estimates. The difference is due to previous studies excluding low doses of lead, assuming they have no effect. The news here is that any rise of lead is dangerous. The study is observational and looking for correlation, involves 12k people, and controls for all usual factors including wealth. It seems legit to me, given that controls are in place and the mechanism has been well established earlier.