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(A) Vertical distribution of average values and SD of apparent diffusion coefficient (ADC) in three horizontal bins of equal size at positive end-expiratory pressure (PEEP) 0 cm H2O (ascending and descending ramp) and PEEP 9 cm H2O. (B) Percent change of ADC going from PEEP 0 cm H2O to PEEP 9 cm H2O (ascending ramp) and between ascending and descending ramps at PEEP 0 cm H2O. Effect of bin level (ANOVA): ‡P < 0.01 and †P < 0.05.
