Table 6 Univariate and multivariate analyses of risk factors of intensive care unit (ICU) death in the study population

 Age > 62 years

2.45

(1.55–3.90)

< 0.001

 McCabe Fatal

1.55

(0.96–2.49)

0.08

 Immunosuppression or cancer

1.83

(1.15–2.92)

0.01

 Urgent initial surgery

2.04

(1.29–3.23)

0.002

2.71

(1.53–4.81)

0.0006

 Small bowel perforation

1.57

(0.95–2.59)

0.07

 SAPS II > 47 at reoperation

4.26

(2.61–6.94)

< 0.001

4.78

(2.71–8.45)

< 0.0001

 Bacteraemia

1.48

(0.84–2.59)

0.16

1.62

(0.81–3.24)

0.169

 Enterococci

1.71

(1.08–2.69)

0.019

 Non-fermenting Gram-negative Bacteria

2.01

(1.13–3.65)

0.019

 Streptococci

0.54

(0.30–0.96)

0.037

 Empirical imipenem therapy

1.66

(1.01–2.72)

0.044

 Empirical vancomycin therapy

1.56

(0.99–2.46)

0.050

 Empirical antifungal therapy

1.72

(1.08–2.74)

0.019

2.91

(1.62–5.22)

0.0003

 De-escalation documented therapy

0.54

(0.34–0.85)

0.007

0.50

(0.28–0.89)

0.018

 Documented therapy using piperacillin/tazobactam

1.74

(1.09–2.78)

0.018

 Documented antifungal therapy

1.67

(1.05–2.63)

0.026