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Table 4 Univariate analysis of risk factors for complex sternal site infections following coronary artery bypass graft procedures, Queensland public hospitals, 2003-2012

From: Surgical site infections following coronary artery bypass graft procedures: 10 years of surveillance data

Risk factor Crude rate (per 100 procedures) Odd ratio 95% CI p
Sex
  Female 1.2 Referent   
  Male 1.3 1.05 0.73 – 1.49 0.796
Age category, years
  <55 1.2 Referent   
  55-64 1.2 0.98 0.61 – 1.57 0.938
  65-74 1.3 1.08 0.69 – 1.68 0.742
  75+ 1.5 1.29 0.81 – 2.07 0.286
ASA (American Society of Anaesthesiologists) score
  1/2 0.6 0.59 0.08 – 4.29 0.606
  3 1.0 Referent   
  4/5 1.7 1.73 1.29 – 2.32 <0.0001
Priority of surgery
  Elective 1.2 Referent   
  Emergency 1.7 1.40 0.92 – 2.14 0.120
CABG types
  CABG with both sternal and harvest site incisions 1.2 Referent   
  CABG with sternal site incisions only 2.3 1.87 1.17 – 2.99 0.009
Wound classification
  Clean 1.3 Referent   
  Clean-contaminated 0.9 0.67 0.17 – 2.72 0.575
Number of grafts
  1 1.8 1.54 0.97 – 2.44 0.068
  2 1.2 1.01 0.68 – 1.51 0.945
  3 1.2 Referent   
  4 1.5 1.30 0.89 – 1.88 0.171
  5+ 1.0 0.82 0.39 – 1.71 0.599
Antibiotic prophylaxis
  Yes 1.2 Referent   
  No 2.6 2.09 1.15 – 3.78 0.015