| 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 | Â | Â | Â |
   % in 2003-2005 | 42.6% | 49.0% | X2 = 1.41 p = 0.24 |
Type of patients | Â | Â | Â |
% (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 |