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.
Mean of spirometer parameters according to exposure years. FVC, forced vital capacity; FEV1, forced expiratory volume in 1 s; FEV1%, the ratio of FEV1/FVC; FEF25, 25% flow of the FVC; FEF75, 75% flow of the FVC; FEF2575, average flow between 25% and 75% of the FVC; PEF, peak expiratory flow.
