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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.