Table 3. Lung Volumes and Mean CT Numbers at Lung Apex and Base during HFOV at Different P^aws

*P < 0.01 vs.  ^inc.

†P < 0.01 vs.  1.5^inc.

‡P < 0.01 vs.  Pflex^dec.

§P < 0.01 vs.  1.5 ^dec.

CT = computed tomography; dec = decrease; HFOV = high-frequency oscillatory ventilation; HU = Hounsfield unit; inc = increase; over = overdistended lung volume; Pflex = inflection point; poor/non = poorly and nonaerated lung volume; TLV = total slice lung volume.