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Kaplan-Meier survival analysis by end-expiratory Pl. The average daily value of Pl from baseline through Day 3 was used for analyses. Pl data were missing in one patient, assigned to Pes-guided PEEP, in whom the esophageal balloon catheter could not be inserted successfully. PEEP = positive end-expiratory pressure; Pes = esophageal pressure; Pl = transpulmonary pressure.
