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Table 1 Characteristics of 701 patient admissions with reported surgical site infection, and differences between those with known and unknown 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

 

Known

N = 625

Unknown

N = 76

Test of difference

% male patients

54.2%

38.2%

X2 = 7.03 p < 0.01

Average age (SD)

57.1 (18.4)

60.4 (15.6)

t = -1.67 p = 0.10

% ASA class > = 3

34.1%

15.8%

X2 = 10.40 p < 0.01

Period

   

   % in 2003-2005

43.7%

51.3%

X2 = 1.60 p = 0.21

Type of patients

   

% (cardio)vascular

14.9%

17.1%

X2 = 0.26 p = 0.61

% trauma

17.8%

26.3%

X2 = 3.26 p = 0.07

% digestive or gastrointestinal tract

44.8%

36.8%

X2 = 1.74 p = 0.19

% other

22.6%

19.7%

X2 = 0.31 p = 0.58

% less severe SSI

70.6%

82.9%

X2 = 5.10 p = 0.02