Table 4.

Mixed effect logistic regression analysis for factors associated with an improvement in oxygenation in the prone position, including the oxygen response at the previous session

	Odds ratio	95% Confidence interval	p
PaO2/FiO2 (/each decrease by 10 mmHg)	1.127	0.970–1.310	0.117
Driving pressure (cmH2O)	1.065	0.956–1.043	0.248
SAPS II	1.005	0.967–1.043	0.814
R/I ratio	0.986	0.618–1.574	0.954
O2-response at previous PP session	3.690	1.270-10.718	0.017

N = 106 sessions

FiO₂ inspired fraction in oxygen; PaO₂ arterial partial pressure in oxygen; PP prone position; R/I recruitment-to-inflation ratio; SAPS simplified acute physiology score