Table 1 Univariate analysis of risk factors associated with postoperative complications

Age (year)^a

53.4 ± 10.4

53.1 ± 9.6

53.5 ± 10.8

0.717

Sex, male, n (%)^c

179 (49.9)

52 (37.4)

127 (57.7)

<0.001

BMI (kg/m²)^a

22.3 ± 3.7

21.6 ± 3.5

22.7 ± 3.7

0.004

 Diabetes mellitus

49 (13.6)

16 (11.5)

38 (17.3)

0.137

 Hypertension

113 (31.5)

40 (28.8)

73 (33.2)

0.381

Preoperative hemoglobin (g/L)^a

120.7 ± 58.6

109.4 ± 26.9

127.8 ± 70.9

0.004

Preoperative ALB (g/L)^a

40.6 ± 3.8

40.2 ± 4.0

40.8 ± 3.7

0.185

Preoperative CRP (mg/L)^a

9.5 ± 23.8

12.2 ± 27.1

7.9 ± 21.3

0.097

Operation time (min)^b

160 (70–383)

160 (70–365)

165 (70–383)

0.483

0.117

 Right colectomy

126 (35.1)

60 (43.2)

66 (30.0)

 Transverse colectomy

14 (3.9)

5 (3.6)

9 (4.1)

 Left colectomy

44 (12.3)

19 (13.7)

25 (11.4)

 Sigmoid resection

41 (11.4)

12 (8.6)

29 (13.2)

 Rectal resection

116 (32.3)

38 (27.3)

78 (35.5)

 Total colectomy

18 (5.0)

5 (3.6)

13 (5.9)

Laparoscopic surgery, n (%)^c

142 (39.6)

49 (35.3)

93 (42.3)

0.185

 Conversion, n (%)^c

25 (7.0)

11 (7.9)

14 (6.4)

Estimated blood loss (ml)^a

226 ± 137

245 ± 139

214 ± 134

0.035

Stoma creation, n (%)^c

58 (16.2)

30 (21.6)

28 (12.7)

0.026

CRP on POD 3 (mg/L)^a

89.1 ± 64.4

123.1 ± 66.9

67.7 ± 52.5

<0.001

Postoperative CAR^a

2.8 ± 2.3

4.2 ± 2.6

2.0 ± 1.6

<0.001

<0.001

 Malignant

299 (83.3)

97 (69.8)

202 (91.8)

 Non-malignant

60 (16.7)

42 (30.2)

18 (8.2)

ASA ≥3, n (%)^c

27 (7.5)

16 (11.5)

11 (5.0)

0.023

Intraoperative blood transfusion, n (%)^c

19 (5.3)

11 (7.9)

8 (3.6)

0.078