| 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 | Â | Â | Â |
   % in 2003-2005 | 43.7% | 51.3% | X2 = 1.60 p = 0.21 |
Type of patients | Â | Â | Â |
% (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 |