Figure 1.
Comparison of FeNO values among the three groups.
Abbreviations: FeNO, fractional exhaled nitric oxide; ppb, parts per billion; ACOS, asthma–COPD overlap syndrome.
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.