Table 3. The predictive factors for weaning failure in surviving patients requiring PMV.

Variables	Univariate analysis				Multivariate analysis
	OR	95% CI	P value		OR	95% CI	P value
Age	1.08	1.01–1.15	0.025		–	–	–
Respiratory cause	4.12	1.22–13.83	0.023		4.91	1.29–18.68	0.019
MODS	4.65	1.33–16.31	0.015		5.63	1.41–22.51	0.015

PMV, prolonged mechanical ventilation; OR, odds ratio; CI, confidence interval; MODS, multiple organ dysfunction syndrome.