Table 1.
Univariate analysis of SSI risk factors
| Variable | Relative risk | 95% C.I. | |
|---|---|---|---|
| Lower | Upper | ||
| Diabetes mellitus | 3.271 | 1.457 | 7.344 |
| Age | 1.002 | 0.994 | 1.011 |
| Male gender | 1.305 | 0.605 | 2.816 |
| BMI > 35 | 1.864 | 0.810 | 4.287 |
| Surgical time > 2.5 hours | 1.061 | 0.896 | 1.257 |
| ASA ≥ 3 | 1.274 | 0.589 | 2.754 |
| EBL | 1.608 | 1.083 | 2.390 |
| Antibiotic redosing | 1.557 | 0.677 | 3.580 |
| Bone allograft | 0.753 | 0.316 | 1.791 |
| Drain placement | 1.843 | 0.822 | 4.135 |
| Tobacco use | 1.195 | 0.520 | 2.748 |
BMI = body mass index; ASA = American Society of Anesthesiologists; EBL = estimated blood loss.