. 2020 Nov 12;20:837. doi: 10.1186/s12879-020-05567-6

Table 4.

Univariate and multivariate logistic regression analysis of risk factors of SSI following colorectal surgery

Variables	univariate		multivariate
Variables	p value	OR (95% CI)	p value	OR (95% CI)
Hypertension
Yes	0.007	1.975(1.207–3.232)	0.024	1.903(1.088–3.327)
No^a
Tuberculosis
Yes	0.017	8.972(1.475–54.559)	0.083	7.880(0.762–81.492)
No^a
Albumin
≥ 3.5 g/dl^a
< 3.5 g/dl	< 0.001	2.960(1.821–4.810)	0.069	1.715(0.958–3.068)
Blood glucose
80–150 mg/dl^a
> 150 mg/dl	0.008	2.417(1.256–4.651)	0.879	1.065(0.475–2.388)
< 80 mg/dl	0.637	1.166(0.617–2.200)
Type of surgery
Rectal surgery^a
Colon surgery	0.002	2.419(1.370–4.269)	0.154	0.631(0.335–1.188)
Urgency of surgery
Elective^a
Emergency	< 0.001	5.927(3.245–10.827)	0.913	1.056(0.397–2.815)
Timing of hair removal
None^a
Night before surgery	0.009	0.477(0.272–0.834)	0.342	0.711(0.352–1.442)
Day of surgery	0.311	0.698(0.348–1.399)
Bowel preparation
None^a
MBP only	< 0.001	0.376(0.223–0.634)	0.185	0.650(0.344–1.229)
OABP only	0.554	1.324(0.523–3.355)
MBP + OABP	0.083	0.427(0.163–1.119)
Approach
Open^a
Laparoscopic or robotic	< 0.001	0.259(0.157–0.429)	< 0.001	0.363(0.200–0.659)
Incisional protection
None^a
Wound edge protector	0.545	0.833(0.460–1.507)
Gauze	0.368	0.676(0.288–1.585)
Adhesive incise drapes	0.031	0.472(0.239–0.932)	0.018	0.400(0.187–0.855)
Skin closure materials
Silk sutures^a
Absorbable sutures	0.060	0.524(0.268–1.027)
Skin staples	0.953	0.978(0.466–2.051)
other	0.053	2.496(0.988–6.307)
Incisional wound irrigation
None^a
Incisional wound irrigation	0.111	0.465(0.181–1.193)
Hydrogen peroxide solution	0.317	0.500(0.129–1.942)
Saline	0.134	0.562(0.264–1.195)
Other	0.257	1.920(0.621–5.936)
Colostomy/ileostomy
No^a
Yes	< 0.001	3.805(2.233–6.483)	0.081	1.820(0.929–3.564)
NNIS risk index
0 or 1^a
2 or 3	< 0.001	6.481(3.655–11.493)	< 0.001	3.840(1.926–7.658)

^areference