Table 2 Univariate analysis for PPOI risk factors in colon cancer

Sex

1.923 (1.242–2.977)

0.003

 Male

83

440

 Female

31

316

Age (years)

64.4±10.3

55.6±12.0

0.932 (0.913–0.950)

0.000

Diabetes mellitus

0.777 (0.517–1.170)

0.227

 No

71

514

 Yes

43

242

Hypertension

0.859 (0.569–1.296)

0.469

 No

73

510

 Yes

41

246

Smoking habit

1.830 (1.211–2.766)

0.004

 No

71

568

 Yes

43

188

Current alcohol use

0.774 (0.511–1.172)

0.227

 No

74

533

 Yes

40

223

Previous abdominal surgery

0.741 (0.438–1.254)

0.264

 No

94

653

 Yes

20

103

Chronic obstructive pulmonary disease

0.723 (0.412–1.269)

0.258

 No

97

671

 Yes

17

85

BMI (kg/m²)

22.8±2.5

23.1±3.2

1.043 (0.977–1.113)

0.207

Preoperative anemia

0.817 (0.532–1.256)

0.358

 No

79

555

 Yes

35

201

Preoperative serum albumin level (g/L)

37.7±3.7

39.0±4.6

1.070 (1.022–1.120)

0.004

ASA score

0.728 (0.476–1.114)

0.143

 I–II

77

560

 III–IV

37

196

Tumor size

0.768 (0.517–1.141)

0.191

 <5 cm

51

388

 ≥5 cm

63

368

Operation type

2.414 (1.619–3.600)

0.000

 LC

58

540

 RC

56

216

Operation time (min)

1.799 (1.196–2.707)

0.005

 <180

41

380

 ≥180

73

376

Intraoperative blood loss (ml)

179.8±101.6

169.3±72.7

0.998 (0.986–1.011)

0.178

Grade of differentiation

0.997 (0.739–1.364)

0.987

 Well

22

119

 Moderate

56

426

 Poorly

36

211

Lymph node resected

23.5±9.3

24.3±9.6

1.010 (0.988–1.032)

0.395

pTNM stage

1.022 (0.774–1.349)

0.880

 I

23

124

 II

46

354

 III

45

278