Fig. 2.
a Kaplan–Meier curve for mortality according to lung ultrasound severity. b Kaplan–Meier curve for the combination of need for invasive mechanical ventilation or mortality according to lung ultrasound severity
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.