Table 4. Results for respiratory mechanics and oxygenation index at baseline to 48 hours

Variable	Absolute difference1)	95%CI	p-value
PaO2/FiO2 ratio	81.5	52.7 to 108.6	<0.001
Crs (mL/cmH2O)	3.9	2.0 to 5.9	<0.001
Airway driving pressure (cmH2O)	–2.6	–4.0 to –1.35	<0.001
Plateau pressure (cmH2O)	–2.5	–3.5 to –1.0	0.001
Esophageal end-expiratory pressure (cmH2O)	–1.1	–1.5 to –0.7	<0.001
Transpulmonary end-expiratory pressure (cmH2O)	1.7	1.2 to 2.3	<0.001

The Hodges-Lehmann estimator was utilized to calculate unbiased median differences.
CI, confidence intervals; PaO₂, partial pressure of arterial oxygen; FiO₂, fraction of inspired oxygen; Crs, compliance respiratory system.