An official website of the United States government
Here's how you know
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.
The 3-year overall survival rate in patients with FEV1/FVC ratio equal to or above the indicated cutoff value. FVC, forced volume vital capacity; FEV1, forced expiratory volume in 1 second.