Fig 1. Flow chart.
1 Multiple requests for a same patient: only the first was analysed. 2 Multiple ICU stays for a same patient: only the first was analysed.
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.