Fig. 2

Arterial Blood Gases. Box plots of pH, arterial partial pressure of carob dioxide (PaCO2) and the ratio between arterial partial pressure to inspired fraction of oxygen (PaO2/FiO2) are depicted for control treatment and lung protective (LPV) ventilation strategies groups, at induction, 1 and 4 h after induction and at the extubation. The bottom and top of the box indicate the 25th and 75th percentile, the horizontal band near the middle of the box is the median, and the ends of the whiskers represent the 10th and 90th percentiles. P values between study arms are report in the figures