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Table 4 Intra operative factors associated with surgical site infection at Bugando medical centre

From: Predictors of surgical site infections among patients undergoing major surgery at Bugando Medical Centre in Northwestern Tanzania

Variable SSI    
  Yes n (%)
N = 65
No n (%)
N = 185
P value OR 95% CI
Nature of operation      
Elective 54 (83%) 142 (76.7%)   1  
Emergency 11 (17%) 43 (23.3%) 0.29 0.67 0.32-1.39
Type of anaesthesia      
GA 56 (86.1%) 161 (87%)   1  
SAB 9 (13.9%) 24 (13%) 0.86 1.07 0.47-2.46
Surgeon      
Registrar 7 (10.7%) 32 (17.3%)   1  
Resident 13 (20%) 37 (20%) 0.37 1.6 0.57-4.5
Specialist 45 (69.2%) 116 (62,7%) 0.21 1.8 0.73-4.3
Use of drain      
Yes 26 (40%) 28 (15.1%) < 0.001 3.8 2.0-7.14
No 39 (60%) 157 (84.9%)   1  
Wound classification      
Clean 41(63%) 152 (82%)   1  
Clean contaminated 20 (30.7%) 26 (14%) 0.002 2.85 1.44-5.61
Contaminated 4 (6.3%) 7 (4%) 0.25 2.12 0.59-7.59
Suture      
Nylon 44 (67.7%) 118 (63.8%)   1  
Silk 10 (15.4%) 9 (4.9%) 0.16 2.08 0.73-5.94
Vicryl 11 (16.9%) 57 (30.8%) 0.01 0.33 0.13-0.77
Duration of operation      
< 3 hours 43 (66.1%) 163 (88.1%)   1  
≥ 3 hours 22 (33.9%) 22 (11.9%) < 0.001 3.8 1.92-7.48
Number of people in theatre      
≤ 6 11 (16.9%) 137 (74%)   1  
≥ 7 54 (83.1%) 48 (26%) < 0.001 14 6.77-29
  1. GA: General anesthesia, SAB: spinal anesthesia block, OR: Odd ratio, CI: confidence interval