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.
Average T/S ratios were inversely associated with age among all smoking groups. Linear equations and correlation values (CV): current smoker: 1.70 - 0.011 * Age, former smoker: 1.50 - 0.008 * Age, never smoker: 1.56 - 0.008 * Age.
