Table 5. Multivariable risk factor analysis for the occurrence of nosocomial infections.

Parameter	OR	95% CI	p value
Antibiotic treatment in previous 6 months	2.9	1.5–5.7	0.001
Underlying gastrointestinal disease	2.3	1.4–3.6	<0.001
Surgery in previous 12 months	1.8	1.1–3.0	0.023
More than 2 underlying diseases	1.7	1.1–2.6	0.016
Per device	1.4	1.2–1.5	<0.001

Area under receiver operating characteristic (ROC) curve = 0.78 OR, odds ratio; 95% CI, 95% confidence interval; p value, level of significance