Table 3.

Univariate and multivariate Cox regression analysis for discontinuation from ventilation at Day 14 among patients with PaO₂/FiO₂ ratio < 200 mmHg

Variables	Univariate Cox regression		Multivariate Cox regression
	Hazard ratio (95% CI)	p	Hazard ratio (95% CI)	p
Pendelluft	0.592 (0.354–0.991)	0.046	0.562 (0.334–0.946)	0.030
APACHE II score	0.930 (0.891–0.970)	0.001	0.922 (0.882–0.964)	< 0.001
PaO2/FiO2 ratio	1.008 (1.002–1.015)	0.016	1.009 (1.002–1.016)	0.015
PEEP	1.020 (0.980–1.122)	0.684	Not included

APACHE Acute Physiology and Chronic Health Evaluation, PEEP positive end-expiratory pressure, PaO₂ arterial partial pressure of oxygen, FiO₂ fraction of inspired oxygen