Table 5.

Multivariate analysis of predictive factors of P. aeruginosa SSI

	P. aeruginosa SSI/ Other SSI	P-value	OR (95% CI)
NNIS 1–2, %	74.2/44.2	0.04	2.3 (1.03–5.40)
Rectal surgery, %	45.2/37.4	0.3	1.4 (0.70–2.70)
Oral antibiotic prophylaxis, %	17.7/33.6	0.02	0.4 (0.23–0.90)
Ostomy, %	46.8/36	0.5	1.2 (0.60–2.30)

P. aeruginosa: Pseudomonas aeruginosa, SSI: surgical site infection, OR: Odds Ratio, 95% CI: 95% confidence interval, ASA: American Society of Anaesthesiologists’ physical status. NNIS: National Nosocomial Infections Surveillance Risk Index