Table 3: Peri-operative/operative characteristics of the included surgical patients classified according to the presence of SSIs.
Peri-operative and operative variables No SSIs (N=1428) No. (%) SSIs (N=183) No. (%) Odds ratio (95% CI) and P value
-Type of surgery:
Elective
Emergency
-Pre-operative antibiotics:
No
Yes
-ASA score:
I
II
≥ III
-Wound drainage:
No
Yes
- Wound class:
Clean
Clean-contaminated
Contaminated
Dirty
-Total operative time (minutes): Median (IQR)
- Admission to ICU:
No
Yes
-ICU length of stays (days): median (IQR)
-Total length of hospital stay (days): Median (IQR)
-Types of infections: No. (%)
Superficial incisional
Deep incisional
Organ/space
1036(72.5)
392(27.5)

241(16.9)
1187(83.1)

967(67.6)
311(21.8)
150(10.5)

1105(77.4)
323(22.6)

1024(71.7)
284(19.9)
102(7.1)
18(1.3)
65.0(60.0-110.0)

11237(86.6)
191(13.4)
2.0(1.0-3.0)
4.0(1.0-5.5)

-
-
-

59(32.2)
124(67.8)

39(21.3)
144(78.7)

101(55.2)
45(24.6)
37(20.2)

91(49.7)
92(50.3)

40(21.9)
51(27.9)
79(43.1)
13(7.1)
85.0(65.0-150.0)

96(52.5)
87(47.5)
4.0(2.0-5.5)
11.0(4.0-15.0)

89(48.6)
65(35.6)
29(15.8)
Reference
5.55(3.94-7.84)**

1.33(0.90-1.98)
Reference

Reference
1.17(0.80-1.70)
2.16(1.42-3.27)**

Reference
3.46(2.49-4.80)**

Reference
1.56(1.08-2.24)*
9.88(6.82-14.31)**
5.99(2.72-13.11)**
0.003c

Reference
5.87(4.17-8.25)**
0.011 c
0.010 c

--
--
--