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.
Receiver operator characteristic curves of the bronchodilator reversibility measures for a,c) current doctor-diagnosed asthma and b,d) asthma–COPD overlap in the a,b) general and c,d) symptomatic samples. FEV1: forced expiratory volume in 1 s.
