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.
Kaplan-Meier (K-M) curves of symptom duration and the comparison of restricted mean duration. Panel A. Between severity groups. Panel B. Between regions. NOR – no oxygen requirement, NIOR – non-invasive oxygen requirement, IOR – infection requiring invasive oxygen, RSA – Republic of South Africa.
