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Table 1 Demographic and clinical characteristics of patients undergoing coronary artery bypass graft (CABG) procedures, 2003-2012

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

Characteristic* N %
Number of hospitals 3  
Number of patients undergoing CABG procedures 14,517  
Sex   
  Male 11,379 78.4
  Female 3,138 21.6
Age, median (interquartile range), years 66 (58 – 73)  
Age category, years   
  <55 2,357 16.2
  55-64 3,941 27.2
  65-74 5,150 35.5
  75+ 3,069 21.1
ASA (American Society of Anaesthesiologists) score   
  1 6 0.1
  2 164 1.1
  3 7,787 54.1
  4 6,349 44.1
  5 83 0.6
Priority of surgery   
  Emergency 1,462 10.2
  Elective 12,896 89.8
Types of CABG   
  CABG with both sternal and graft site incisions 13,637 93.9
  CABG with sternal site incisions only 880 6.1
Wound classification   
  Clean 14,286 98.4
  Clean-contaminated 228 1.6
Mean number of grafts 2.9  
Category of graft numbers   
  1 1,394 9.6
  2 3,218 22.2
  3 5,846 40.3
  4 3,197 22.1
  5+ 837 5.8
Antibiotic prophylaxis   
  Yes 13,851 96.7
  No 466 3.3
  1. *Five variables with missing values: ASA score (128, 0.9%), priority of surgery (159, 1.1%), wound classification (3, 0.02%), category of graft numbers (25, 0.2%), and antibiotic prophylaxis (200, 1.4%).