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P/F ratio of the acute respiratory distress syndrome swine model under different conditions. *P<0.05 vs. pre-injury; †P<0.05 vs. injury. P/F, alveolar partial pressure of oxygen/fraction of inspiration oxygen (oxygenation index); PEEP, positive end-expiratory pressure; Po, optimal PEEP; -n, n cm Hg below Po; +n; n cm Hg above Po.
