Table 4.

Unadjusted and multivariate analyses of outcomes stratified by appropriateness of empirical antibiotic therapy in patients who had a positive culture within 24 h (n = 449)

Outcome	Unadjusted analysis			Multivariate analysisa
	Appropriate (n = 366)	Inappropriate (n = 83)	P value
Hospital length of stay (days)
All patients				1.00 (−1.15-3.15)b
Median (IQR)	4 (2, 7)	4 (3, 6)	0.26c
Mean ± SD	5.6 ± 6.2	6.1 ± 7.9	0.31c
Subset of patients discharged alive				0.99 (−1.16-3.14)b
Median (IQR)	4 (2, 6)	4 (3, 6)	0.20c
Mean ± SD	5.6 ± 6.1	6.1 ± 7.9	0.25d
No. (%) of patients with in-hospital mortality	5 (1.4)	0	0.59e	—f
No. (%) of patients with readmission/death within 30 days
All patients	48 (13.1)	8 (9.6)	0.46e	With ulcers, 11.76 (1.30–111.11)g,h; without ulcers, 1.05 (0.43–2.60)g
Subset of patients discharged alive	43 (11.9)	8 (9.6)	0.70e	1.48 (0.63–3.48)g

^aAdjusted for variables in Table 1.

^bRegression mean difference in days (95% CI).

^cWilcoxon rank sum test.

^dt test on log-transformed length of stay.

^eChi-square test.

^f—, not done because of small sample size.

^gAdjusted odds ratio (95% CI).

^hP = 0.03.