Table 5.
Univariate and multivariate analysis for factors associated with an increased risk of developing a surgical site infection among all vascular cases
| SSI | No SSI | Univariate analysis p-value | Multivariate analysis p-value | Odds ratio (95% CI) | |
|---|---|---|---|---|---|
| Total | 23 | 147 | |||
| Sex (M:F) | 21:2 | 88:59 | 0.008 | – | |
| Mean age (range) | 67.7 (50–83) | 66.0 (19–90) | 0.787 | – | |
| Mean operative time (range) in minutes | 116.9 (35–230) | 84.4 (20–350) | 0.011 | – | |
| ‘Re-do’ procedures | 3 (13%) | 9 (6%) | 0.512 | – | |
| Arterial procedures | 20 (87%) | 123 (84%) | 0.49 | – | |
| Arterial grafts used | 19 (83%) | 62 (42%) | 0.001 | 0.002 | 6.945 (2.092–23.056) |
| Groin incision | 16 (70%) | 56 (38%) | 0.004 | 0.013 | 3.809 (1.319–10.994) |
| Antibiotic prophylaxis given | 21 (91%) | 122 (83%) | 0.139 | – | |
| Diabetes | 4 (17%) | 15 (10%) | 0.282 | – | |
| Ischaemic heart disease | 10 (43%) | 39 (27%) | 0.320 | – | |
| Chronic obstructive pulmonary disease | 4 (17%) | 23 (16%) | 0.72 | – | |
| Cases in non-laminar flow theatre | 19 (83%) | 95 (65%) | 0.108 | 0.026 | 4.016 (1.178–13.689) |
SSI = surgical site infection; CI = confidence interval