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.
Distribution of patients according to the age (years), the duration of oxygen therapy requirement (days), the occurrence of a serious event, and per the 3 classes of body mass index (18.5–25 kg/m2 (reference) (in white), 25–30 kg/m2 (in grey), and ≥30 kg/m2 (in black)).
