Table 3.

Multivariate Cox analysis using two negative LTA samples for negativity

	Multivariate analysis
	HR	95% CI	p value
Age	1.05	0.99–1.105	0.080
Sex, female	1.52	0.64–3.63	0.35
Type 2 diabetes mellitus	0.23	0.07–0.69	0.0089
AKI during ICU stay	1.41	0.59–3.36	0.44

HR hazard ratio, CI confidence interval, ICU intensive care unit, AKI acute kidney insufficiency, LTA lower tracheal aspirate