Fig. 1From: Oxygenation versus driving pressure for determining the best positive end-expiratory pressure in acute respiratory distress syndromeDistribution of the best PEEP levels determined based on absolute PaO2/FiO2 ratio (PEEPO2) or driving pressure (PEEPDP). The percentage of patients with each PEEP level differed significantly between the two methods (Chi-2, 9.3; P = 0.025)Back to article page