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

Table 6 Multivariate risk estimates of acquiring a surgical-site infection

Risk factor		Adjusted odds ratio	95% confidence interval	P
Arm	A	Reference	-
	B	0.68	0.20,2.31	0.539
Gender	Male	Reference	-
	Female	0.86	0.22,3.36	0.828
Center	European Institute of Oncology	Reference	-
	San Gerardo Monza	0.89	0.17,4.70	0.893
Smoking status	Never	Reference	-
	Previous	0.54	0.13,2.26	0.332
	Active	1.35	0.19,9.74	0.539
Diagnosis	Colon	Reference
	Rectal	4.07	1.01,16.4	*0.048*
Preoperative treatment	None	Reference	-
	CT+RT	1.96	0.26,14.9	0.516
ASA	I	Reference	-
	II	0.25	0.01,4.59	0.224
	III	0.57	0.03,11.4	0.903
Age ^a		1.05	0.97,1.14	0.253
BMI ^a		1.08	0.93,1.24	0.317
Wound length ^a		0.96	0.84,1.09	0.535

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

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