Fig. 1.
Flowchart. This figure shows the patient selection process for inclusion in the study. From the 714 patients presenting with mild acute respiratory distress syndrome (ARDS) in the Large Observational Study to Understand the Global Impact of Severe Acute Respiratory Failure (LUNG SAFE), 601 fulfilled the criteria for inclusion, and 580 had data allowing classification in the defined categories after day 1 (D1; green box). *Twenty-one not in the intensive care unit (ICU) at ARDS day 2 (D2): 12 died, 5 were transferred to another ICU, and 4 were discharged alive from the ICU. ECMO, extracorporeal membrane oxygenation; Fio2, fraction of inspired oxygen; LST, life-sustaining treatment.