Fig. 4.

Box-and-whisker plots of driving pressure chest wall measured with the esophageal probe (red) and the dorsal (blue) and ventral (green) pleural sensors in supine (SP) and prone (PP) positions at different levels of positive end-expiratory pressure (PEEP) from 20 to 5 by steps of 5 cmH₂O. *P < 0.05 vs. PEEP 20 cmH₂O. Vertical lines indicate $\text{median}\pm \text{1}\text{.58}\times \text{IQR}\sqrt{\text{sample size}}$, where IQR is interquartile range.