Table 3.

Analysis of oxygenation in patients undergoing cardiac surgery.

Variable	PEEP 10	PEEP 12	PEEP 15	Pa
PaO2 (mmHg)
Before	124.8±16.5	128.1±28.8	112.9±19.5	0.26
After	131.3±16.8	137.6±25	139.4±11	0.53
Pb	0.33	0.11	0.02
Oxygenation Index (mmHg)
Before	312±41.3	320.4±72	282.3±48.8	0.29
After	328.3±42.1	343.9±62.6	348.5±27.6	0.6
Pb	0.33	0.11	0.02
Arterial Oxygen Saturation (%)
Before	97±2	96.6±1.5	96.3±2.5	0.71
After	96.9±1	97.2±1.3	96.1±3.3	0.52
Pb	0.76	0.21	0.86

^aKruskal-Wallis test;

^bWilcoxon test; PEEP=positive end expiratory pressure; PaO2=oxygen blood pressure