Fig. 6.
Relative changes observed between control condition and after surfactant depletion in effective lung volume (ELV) for gas exchange (filled bars) and end-expiratory lung volume (EELV; hollow bars) with varying positive end-expiratory pressure (PEEP). * P < 0.05 between ELV and EELV within a PEEP. # P < 0.05 versus PEEP 0; $ P < 0.05 versus PEEP 3.