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 survival analysis by randomly assigned treatment group, stratified by APACHE-II score. Low and high APACHE-II scores refer to patients with values less or greater than the median APACHE-II score, respectively. Median APACHE-II score was 27.5. APACHE-II = Acute Physiology and Chronic Health Evaluation II; PEEP = positive end-expiratory pressure; Pes = esophageal pressure.
