Figure 3. Hazard Ratio of death (HR, 95%CI) by number (N) and type of E-COPD experienced during follow-up.
Time-dependent Cox model adjusted by age, sex, comorbidities (Charlson index) and history of E-COPD in the three-year pre-index period.
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.