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Table 2 Characteristics of patient admissions with reported surgical site infection: differences between those with positive and negative culture results (Leiden University Medical Centre, 1997-2005)

From: Evaluation of routinely reported surgical site infections against microbiological culture results: a tool to identify patient groups where diagnosis and treatment may be improved

 

Positive

N = 523

Negative

N = 102

Test of difference

% male patients

55.1%

50.0%

X2 = 0.88 p = 0.35

Average age (SD)

57.0 (18.1)

57.7 (20.2)

t = 0.35 p = 0.73

% ASA class > = 3

36.1%

23.5%

X2 = 6.04 p = 0.01

Period

   

   % in 2003-2005

42.6%

49.0%

X2 = 1.41 p = 0.24

Type of patients

   

% (cardio)vascular

15.1%

13.7%

X2 = 0.13 p = 0.72

% trauma

16.3%

25.5%

X2 = 4.99 p = 0.03

% digestive or gastrointestinal tract

45.9%

39.2%

X2 = 1.54 p = 0.22

% other

22.8%

21.6%

X2 = 0.07 p = 0.79

% less severe SSI

68.8%

79.4%

X2 = 4.60 p = 0.03