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 |