Table 1 Comparison of baseline information of patients in the observation and control groups

Gender [n (%)]

χ² = 1.773

0.183

 Male

15 (65.2)

9 (45.0)

 Female

8 (34.8)

11 (55.0)

Age(years)

66.7 ± 10.5

67.8 ± 11.2

t = 0.320

0.751

BMI (kg/m²)

22.65 ± 2.95

21.69 ± 4.41

t = 0.851

0.400

Degree of obstruction [n (%)]

χ² = 0.183

0.669

 Complete

13 (56.5)

10 (50.0)

 Incomplete

10 (43.5)

10 (50.0)

Site of obstruction [n (%)]

χ² = 3.478

0.349

 Flexure of spleen

2 (8.7)

2 (10.0)

 Descending colon

10 (43.5)

4 (20.0)

 Sigmoid colon

8 (34.8)

12 (60.0)

 Straight B junction

3 (13.0)

2 (10.0)

 Maximum diameter of tumor (cm)

4.5 (3.5,5.1)

4.75 (4.0, 5.0)

z = 0.087

0.931

Anemia [n (%)]

χ² = 1.713

0.191

  (+)

7 (30.4)

10 (50.0)

  (−)

16 (69.6)

10 (50.0)

Electrolyte disturbances [n (%)]

χ² = 5.969

0.015

 (+)

13 (56.5)

4 (20.0)

 (−)

10 (43.5)

16 (80.0)

Pathological T staging [n (%)]

χ² = 2.618

0.106

 T1

0

0

 T2

0

0

 T3

17 (73.9)

10 (50.0)

 T4

6 (26.1)

10 (50.0)

Pathological N staging [n (%)]

χ² = 4.923

0.162

 N0

9 (39.1)

4 (20.0)

 N1

12 (52.2)

9 (45.0)

 N2

2 (8.7)

6 (30.0)

 N3

0

1 (5.0)

Pathology TNM staging [n (%)]

χ² = 2.199

0.138

 I

0

0

 II

8 (34.8)

3 (15.0)

 III

15 (65.2)

17 (85.0)

Degree of tumor differentiation [n (%)]

χ² = 2.453

0.886

 Low differentiation

1 (4.3)

0

 Medium–low differentiation

7 (30.4)

5 (25.0)

 Intermediate differentiation

13 (56.5)

13 (65.0)

 High school differentiation

1 (4.3)

2 (10.0)

 High degree of differentiation

1 (4.3)

0

Tumor emboli in blood vessels [n (%)]

χ² = 1.992

0.158

 (+)

13 (56.5)

7 (35.0)

 (−)

10 (43.5)

13 (65.0)

Neurocarcinoma invasion [n (%)]

χ² = 0.467

0.494

 (+)

8 (34.8)

9 (45.0)

 (−)

15 (65.2)

11 (55.0)

Cancer nodule [n (%)]

χ² = 0.048

0.826

 (+)

4 (17.4)

4 (20.0)

 (−)

19 (82.6)

16 (80.0)