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