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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)

From: Evaluation of antimicrobial prophylaxis use and rate of surgical site infection in surgical ward of Wachemo University Nigist Eleni Mohammed Memorial Hospital, Southern Ethiopia: prospective cohort study

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%)   1  
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)   1  
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%)   1  
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%)   1  
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%)   1  
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%)   1  
  1. RR Relative risk, ARR Adjusted relative risk
  2. *statistically significant