Figure 3.
Acute respiratory events before (baseline) and after (outcome) addition of tiotropium. P<0.001 (marginal homogeneity test) comparing baseline and outcome years.
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.