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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