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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