Table 5 Results of binary and multivariable logistic analysis indicating factors significantly associated with SSI in the surgical ward of WUNEMMH from January 1 to September 1, 2017 (N = 255)
Characteristics | Surgical site infection | RR(95% CI) | ARR(95% CI) | P-value | ||
|---|---|---|---|---|---|---|
Yes N (%) 42 (16.5%) | No N (%) 213 (83.5%) | |||||
Surgery waiting time | >7 days | 33 (55%) | 27 (45%) | 1.92 (1.12–3.31) | 2.48 (1.28–4.79) | 0.007* |
<=7 days | 9 (4.6%) | 186 (95.4%) |  | 1 |  | |
Smokers | Yes | 18 (30%) | 42 (70%) | 7.55 (2.50–22.78) | 8.01 (2.15–29.84) | 0.002* |
No | 24 (12.3) | 171 (87.7%) | Â | 1 | Â | |
Operation time | >1 h | 33 (32.4%) | 69 (67.6%) | 2.57 (1.56–4.23) | 2.13 (1.18–3.86) | 0.012* |
<=1 h | 9 (5.9%) | 144 (94.1%) |  | 1 |  | |
Administering antibiotic before 1 h of operation | > 1 h | 30 (20%) | 120 (80%) | 5.27 (2.05–13.54) | 5.05 (1.79–14.21) | 0.002* |
<=1 h | 12 (11.4%) | 93 (88.6%) |  | 1 |  | |
Residence | Rural | 33 (22.4%) | 114 (77.6%) | 1.57 (0.689–6.786) | 1.53 (0.124–3.740) | 0.691 |
Urban | 9 (8.3%) | 99 (91.7) | Â | 1 | Â | |
Age in year | 1–18 | 6 (8.7%) | 63 (91.3%) | 0.79 (0.305–5.346) | 1.71 (0.206–8.723) | 0.849 |
19–40 | 9 (8.3%) | 99 (91.7%) |  | 1 |  | |
> 40 | 27 (34.6%) | 51 (65.4%) | 7.11 (1.47–15.022) | 7.72 (8.46–40.810) |  | |
ASA Score | >1 | 39 (20.6%) | 150 (79.4%) | 6.09 (0.607–29.16) | 6.27 (0.52–15.501) | 0.076 |
<=1 | 3 (4.5%) | 63 (95.5%) | Â | 1 | Â | |
Co-morbidity | Present | 6 (28.6%) | 15 (71.4%) | 3.51 (0.545–8.96) | 1.39 (0.154–16.11) | 0.358 |
Absent | 36 (15.4%) | 198 (84.6%) | Â | 1 | Â | |
Previous surgery | Yes | 12 (40%) | 18 (60%) | 2.23 (1.540–15.62) | 7.64 (0.639–34.04) | 0.678 |
No | 30 (13.3%) | 195 (86.7%) | Â | 1 | Â | |
Wound class | Clean-contaminated | 27 (24.3%) | 84 (75.7%) | 1.52 (0.194–1.388) | 3.54 (0.70–4.698) | 0.185 |
Clean | 15 (10.4%) | 129 (89.6%) | Â | 1 | Â | |