Table 3.

Multivariable Logistic Regression Models for Risk Factors for Infection during Re-Admission Stay, Overall and by Procedure Type^a

			Re-admission infection by LE procedure
	Infection during re-admission Stay* (n = 262)		Endovascular (n = 123)		Open (n = 139)
	OR (95% CI)	p	OR (95% CI)	p	OR (95% CI)	p
Propensity score	0.41 (0.12–1.43)	0.16
Age (y)	0.99 (0.98–1.01)	0.4338	0.99 (0.97–1.01)	0.34	1.00 (0.98–1.02)	0.99
Female	0.99 (0.69–1.40)	0.9624	0.99 (0.61–1.62)	0.96	1.13 (0.67–1.88)	0.65
Race (reference = African American)
Caucasian	1.39 (0.91–2.10)	0.1249	1.62 (0.91–2.92)	0.10	1.02 (0.56–1.85)	0.96
Other	1.03 (0.41–2.59)	0.9507	1.29 (0.35–4.69)	0.70	0.70 (0.18–2.65)	0.59
Charlson Index (reference = 1)
2					2.22 (1.11–4.45)	0.02
3+					1.06 (0.51–2.20)	0.88
Endovascular procedure	0.48 (0.33–0.70)	0.0001
Length of stay (d)	1.05 (1.01–1.08)	0.01	1.09 (1.04–1.13)	0.0002
Teaching facility	1.78 (1.06–3.00)	0.02
Anemia as an index diagnosis	2.09 (1.35–3.23)	0.0009	2.89 (1.65–5.07)	0.0002
Infection during index stay	1.77 (1.08–2.91)	0.02			2.65 (1.24–5.70)	0.01
Hemoglobin <8 g/dL	2.92 (1.48–5.78)	0.002			4.98 (2.01–12.3)	0.0005

^aBecause post-operative laboratory values were included in the model, 112 observations with no laboratory data were excluded, leaving 658 observations for modeling.

CI = confidence interval; OR = odds ratio.