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.
HR Approximations with 95% CI from Conditional Accelerated Failure Time Models for an Interquartile Range Width (IQRw = 167 µg/m3) Increase in Respirable Elemental Carbon Exposure and Termination of Active Employment, in the DEMS Ever-underground Subcohort
