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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