Table 2.

Murray Lung Injury Score.

	0	1	2	3	4
PaO2/FiO2 on FiO2 100%	300 mmHg	225–299 mmHg	175–224 mmHg	100–174 mmHg	<100 mmHg
Chest X-ray quadrants	Normal	1	2	3	4
PEEP (cmH2O)	≤5	6–8	9–11	12–14	≥15
Compliance (mL/cmH2O)	≥80	60–79	40–59	20–39	≤19