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Table 3 Univariate and Multivariate analysis of risk factors in patients with SSI underwent two types of surgery

From: Multicenter surveillance study of surgical site infection and its risk factors in radical resection of colon or rectal carcinoma

Risk factor Radical resection of colon carcinoma Radical resection of rectal carcinoma
Cases SSI(%) Univariate analysis Multivariate analysis Cases SSI(%) Univariate analysis Multivariate analysis
χ2 P Value Odds Ratio (95%CI) P Value χ2 P Value Odds Ratio (95%CI) P Value
Age (yr)    0.935 0.627      4.101 0.129   
 ≤60 1555 2.38      1061 6.03     
 61–70 1083 2.77      807 4.96     
 > 70 723 3.04      451 3.55     
Sex    3.532 0.060      0.078 0.781   
 Male 2016 2.98      1436 5.22     
 Female 1390 1.94      887 4.96     
BMI    0.107 0.743      0.916 0.338   
 ≤24 2437 2.50      1549 4.97     
 > 24 887 2.71      689 5.95     
Preoperative hospital stay    0.021 0.885      0.006 0.940   
 < 48 h 222 2.70      71 4.23     
 ≥48 h 3184 2.54      2252 5.15     
Surgery type    5.763 0.016 1.558(0.882–2.753) 0.127    17.536 0.000 1.995(1.268–3.139) 0.003
 Emergency 390 4.36      296 10.14     
 Selective 3016 2.32      2027 4.39     
Operative procedure    5.446 0.020 0.540(0.344–0.847) 0.007    0.932 0.334 0.672(0.448–1.006) 0.054
 Laparoscopic 1710 1.93      1628 4.85     
 Open 1696 3.19      695 5.82     
ASA score    4.281 0.039 0.653(0.387–1.103) 0.111    2.700 0.100 0.588(0.361–0.958) 0.033
 1–2 2907 2.34      2003 4.84     
 ≥3 481 3.95      312 7.05     
Operative time    25.636 0.000 0.513(0.379–0.692) 0.000    5.802 0.122 0.619(0.472–0.812) 0.001
 ≤2 h 724 1.80      294 3.06     
 2–4 h 2156 2.04      1410 4.89     
 ≥4 h 526 5.70      619 6.62     
0.5-2 h medication    0.332 0.564      0.760 0.383   
 Yes 2038 2.45      1108 5.60     
 No 1544 2.79      1130 4.78     
No. of beds    5.816 0.055 0.644(0.451–0.921) 0.016    14.707 0.001 0.513(0.356–0.739) 0.000
 ≤1500 591 1.35      274 2.19     
 1500–2500 1297 2.39      655 3.36     
 ≥2500 1518 3.16      1394 6.53