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Table 5 Multivariate 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 Odd ratio 95% CI p Goodness-of-fit C-index
ASA (American Society of Anaesthesiologists) score     0.797 0.588*
  3 Referent     
  4/5 1.83 1.36 – 2.47 <0.0001   
Antibiotic prophylaxis      
  Yes Referent     
  No 2.03 1.12 – 3.69 0.020   
  1. *Validation of the model based on 100 bootstrap samples achieved a mean c-index of 0.579 (95% CI: 0.576 – 0.583), indicating good internal validation.