Figure 1 –
Mean spirometric lung function values among underground coal miners participating in the Enhanced Coal Workers’ Health Surveillance Program, by small-opacity profusion category, 2005-2013 (N = 8,230). %Pred = % predicted.
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.