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.
Forest plot for subgroup analysis of discoloration of resin composite from exposure to cigarette smoke/extract and E‐cigarette aerosol compared with a nonexposure control. CI, confidence interval; E‐cigarette, electronic cigarette; SD, standard deviation.
