primary smelter workers employed for at least 3 years between 1928 and 1979, subjected to blood lead monitoring since 1950, and alive at the start of follow-up (Jan. 1, 1955). Mortality was followed from Jan. 1, 1955 to Dec. 31, 1987.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.