Surgical site infections following colorectal cancer surgery: a randomized prospective trial comparing common and advanced antimicrobial dressing containing ionic silver

Table 5 Univariate risk estimates of acquiring a surgical-site infection

Risk factor		Unadjusted odds ratio	95% confidence interval	P
Arm	A	Reference	-
	B	0.72	0.27,1.90	0.504
Gender	Male	Reference	-
	Female	0.40	0.13,1.18	0.097
Center	European Institute of Oncology	Reference	-
	San Gerardo Monza	0.57	0.19,1.70	0.313
Smoking status	Never	Reference	-
	Previous	1.42	0.50,4.09	0.598
	Smoker	1.14	0.27,4.80	0.951
Diagnosis	Colon	Reference
	Rectal	2.68	1.00,7.21	*0.051*
Preoperative treatment	None	Reference	-
	CT+RT	2.05	0.57,7.35	0.271
ASA	I	Reference	-
	II	1.27	0.14,11.3	0.998
	III	1.60	0.15,17.4	0.658
Age ^a		1.02	0.96,1.08	0.564
Body mass index ^a		1.08	0.97,1.21	0.155
Wound length ^a		0.96	0.88,1.05	0.389

^aOdds-ratio estimated by unit increase. A: standard dressing; B: Aquacel Ag Hydrofiber dressing; CT+RT: preoperative chemoradiation therapy.

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