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.
Sample size estimates. Required sample size per group in two-armed clinical trial for 1-year (A) and 2-years duration (B), to detect various differences in SARA progression as a function of treatment efficacy and a statistical power of 80 and 90%.
