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Table 3 Univariate and multivariate analyses for potential risk factors for SSI

From: Optimal timing of surgical antimicrobial prophylaxis in laparoscopic surgery: a before-after study

  Univariate analyses, OR (95% CI) P value Multivariate analyses, OR (95% CI) P value
Age ≥ 65 1.44 (1.05–1.98) 0.02   
Male gender 0.82 (0.60–1.12) 0.21   
Diabetes mellitus 0.90 (0.59–1.40) 0.65   
Current smoker 1.61 (1.12–2.20) 0.003 1.66 (1.14–2.40) 0.01
ASA score ≥ 2 1.44 (0.95–2.19) 0.09   
Wound class 3 contaminated 2.57 (0.50–13.36) 0.26   
Emergent surgery 0.63 (0.39–1.01) 0.06   
Operation time ≥ 180 min 2.58 (1.79–3.71) < 0.001 2.35 (1.56–3.54) < 0.001
Time windows,
 31–60 min   Ref.   Ref.
  <  0 min 0.67 (0.38–1.17) 0.16 0.78 (0.41–1.46) 0.43
 0–30 min 0.58 (0.39–0.85) 0.01 0.65 (0.41–1.00) 0.052
  > 60 min 0.72 (0.26–1.97) 0.52 1.14 (0.38–3.42) 0.81
Intervention status, “yes” 0.96 (0.69–1.33) 0.80 0.79 (0.54–1.15) 0.22
  1. Abbreviations: SSI surgical site infection, ASA American Society of Anesthesiologists, OR odds ratio, CI confidence interval