Table 2. Ventilatory parameters and blood gas values before and after recruitment maneuvers.

	Mean	SD	p-value*	99%CI for p-value**
Peak pressure (cmH20)
Before	32.6	8.8	0.630	0.630-0.650
After	33.6	10.5
PEEP (cmH20)
Before	14.6	5.2	0.026	0.021-0.029
After	17.3	6.1
Mean pressure (cmH20)
Before	22.3	7.7	0.270	0.270-0.290
After	20.8	6.4
Tidal volume (mL/kg)
Before	188.1	119.9	0.090	0.084-0.099
After	176.3	107.3
Dynamic compliance (mL/cmH20)
Before	11.0	7.7	0.840	0.850-0.870
After	11.1	6.6
FiO2
Before	0.8	0.2	0.003	0.001-0.003
After	0.6	0.2
pH
Before	7.3	0.1	0.180	0.170-0.190
After	7.3	0.1
Bicarbonate (mmol/L)
Before	26.3	9.7	0.059	0.052-0.064
After	23.9	7.2
O2 saturation (%)
Before	91.4	6.6	0.580	0.570-0.590
After	92.0	6.3
PaCO2 (mmHg)
Before	56.6	21.9	0.190	0.180-0.200
After	59.5	18.2
PaO2 (mmHg)
Before	73	18.8	0.320	0.330-0.350
After	77.6	7.2
OI
Before	25.8	16.4	0.019	0.014-0.021
After	21.4	19.6
PaO2/FiO2
Before	107.1	48.4	0.000	0.000-0.000
After	150.3	72.4

SD: standard deviation; CI: confidence interval; *Wilcoxon test; **Monte Carlo method; PEEP: positive end-expiratory pressure; FiO₂: fraction of inspired oxygen; PaCO₂: carbon dioxide partial pressure in arterial blood; PaO₂: oxygen partial pressure in arterial blood; OI: oxygenation index.