Table 4.

Univariate and multivariable regression analysis of the DP and PaO₂/FiO₂ pre, during and post-PPV session as the best predictor of mortality

Variable	Univariate analysis			Multivariable logistic regression
	p-value	OR	95% CI	p-value	Adjusted OR	95% CI
DP pre-PPV (cmH2O)	0.003	1.51	1.55–1.97	0.497	1.193	0.716–1.988
DP during PPV (cmH2O)	<0.001	2.02	1.41–2.91	0.486	0.673	0.716–1.988
DP post-PPV (cmH2O)	<0.001	2.25	1.45–3.48	0.044	3.24	1.033–10.158
PaO2/FiO2 pre-PPV	0.525	0.996	0.981–1.009	0.153	1.021	0.992–1.050
PaO2/FiO2 during PPV	0.013	0.987	0.977–0.997	0.373	0.992	0.975–1.009
PaO2/FiO2 post-PPV	0.004	0.987	0.978–0.996	0.425	0.995	0.981–1.008

CI, confidence interval; DP, driving pressure; PPV, prone position ventilation; PaO₂/FiO₂ ratio, ratio of partial pressure of arterial oxygen to fraction of inspired oxygen; OR, odds ratio