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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