Fig. 7. Oxygen delivery (Dao2) at baseline 1 (BL 1), injury, four settings for mean airway pressure during high-frequency oscillation (PCL+ 2, + 6, + 10, and + 14) and at baseline 2 (BL 2). Mean and SD. * P < 0.05 versus injury, #P < 0.05 versus PCL+ 2, $P < 0.05 versus PCL+ 6.