Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

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.

View full-text article in PMC

. 2016 Aug 1;11:1745–1756. doi: 10.2147/COPD.S111508

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2016 Stockley et al. This work is published and licensed by Dove Medical Press Limited

The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

PMC Copyright notice

Decline in FEV₁ for individual patients with COPD.

Notes: This figure demonstrates the pattern of slow decline (A and B) and rapid decline (C and D) in patients with COPD. A linear pattern in any given individual was seen.

Abbreviations: COPD, chronic obstructive pulmonary disease; FEV₁, forced expired volume in 1 second.