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.
Impact of baseline 6-minute-walk distance on risk of chronic obstructive pulmonary disease (COPD)-related hospitalization or all-cause mortality. Stratified as less than 300 m (n = 96), 300 to 449 m (n = 164), and 450 m or more (n = 66). P < 0.0001 for Kaplan-Meier log-rank test. Subjects at risk are below the x axis.
