TABLE 4.

Association of various factors with length of ICU stay is shown by results of univariate and multivariate analyses^a

Factor	Univariate analysisb			Multivariate analysisb
	HR	95% CI	P value	HR	95% CI	P value
Intervention	1.62	1.03–2.54	0.04	1.79	1.07–2.98	0.03
Preinfection length of stay	0.97	0.95–0.99	0.001	0.97	0.95–0.98	0.0001
Age	1.01	0.99–1.03	0.22	1.0	0.98–1.01	0.90
Sex (female)	0.64	0.40–1.03	0.06	0.69	0.41–1.15	0.15
Time to effective therapy	1.01	0.78–1.32	0.94	1.02	0.75–1.38	0.90
Disease severity (APACHE II)	1.00	0.97–1.02	0.74	0.97	0.93–1.0	0.06
Mortality	1.03	0.57–1.65	0.91	1.43	0.83–2.48	0.20

^aHazard ratio values of >1 are associated with shortened length of stay.

^bHR, hazard ratio; CI, confidence interval.