Fig. 1.
Expected lung function of men who were 83 years old at baseline with 7 years of education, stratified by smokers and non-smokers
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.