Table 7

Surgical variables

VariableInfection
n (%)
No infection
n (%)
RR95% CIP value
Degree of contamination
 Clean8 (7.9)93 (92.1)1
 Clean-contaminated3 (8.6)32 (91.4)1.10.3 to 3.81
 Contaminated3 (8.3)33 (91.7)1.10.3 to 3.81
 Dirty2 (16.7)10 (83.3)2.10.5 to 8.70.287
Duration (minutes)*
 Anaesthesia142 (50.8)112.9 (51.5)29.12.6 to 55.60.92
 Surgery86.5 (35.5)64.1 (40.8)22.41.5 to 43.20.87
Duration of surgery (categorised)
 <60 minutes3 (3.4)86 (96.6)1
 ≥60 minutes13 (13.7)82 (86.3)4.11.2 to 13.80.012
Drains
 No15 (8.6)160 (91.4)1
 Yes1 (11.1)8 (88.9)1.20.2 to 8.80.567
Electrosurgery
 No4 (4.8)80 (95.2)1
 Yes12 (12.0)88 (88.0)2.50.8 to 7.50.083
Scheduling
 Elective11 (7.5)136 (92.5)1
 Urgency5 (13.5)32 (86.5)1.80.7 to 4.90.323
Sterilisation system programme
 Textile—instrumental15 (8.5)161 (91.5)1
 Cauchos0 (0.0)3 (100)
 Quick1 (20.0)4 (80.0)2.30.4 to 14.50.374
Operating room
 22 (6.7)28 (93.3)1
 112 (7.9)140 (92.1)1.20.3 to 5.01
 31 (100)0 (0.0)
 Induction room1 (100)0 (0.0)
Reintervention
 No14 (8.1)159 (91.9)1
 Yes2 (18.2)9 (81.8)2.20.6 to 8.60.246
Skin suture
X/U suture
 No14 (8.1)158 (91.9)1
 Yes2 (16.7)10 (83.3)20.5 to 8.00.28
Simple suture
 Yes0 (0.0)14 (100)
 No16 (9.4)154 (90.6)0.615
Subcuticular suture
 No2 (5.0)38 (95.0)1
 Yes14 (9.7)130 (90.3)1.90.5 to 8.20.529
Continuous suture
 No13 (8.4)141 (91.6)1
 Yes3 (10.0)27 (90.0)1.20.4 to 3.90.728
  • Bold values significantly associated with SSI. p-value < 0.050

  • *Data are expressed as mean (sd) and mean difference.