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.
Percentage of patients alive and free of respiratory failure through 28 days after treatment is presented. Analysis was performed for overall (n = 62) patients, and separately for subgroups of patients under the age of 60 (n = 34) and age 60 or above (n = 28). One-sided P values were calculated using the Wald χ2 test.
