Table 4 Univariable logistic regression analyses for the presence of synchronous peritoneal metastases

Age (years)

293 (4.6)

0.999

0.987–1.10

0.819

Sex

0.750

 Male

168 (4.5)

Ref

Ref

 Female

125 (4.7)

1.039

0.820–1.317

Primary tumor location

< 0.001

 Right colon

137 (6.9)

1.42

1.01–1.83

 Left colon

116 (5.0)

Ref

Ref

 Rectum

26 (1.3)

0.24

0.16–0.37

Tumor differentiation

< 0.001

 Good/moderate

124 (2.5)

Ref

Ref

 Poor/undifferentiated

49 (8.8)

3.703

2.627–5.128

Tumor stage

< 0.001

 T0–2

6 (0.3)

Ref

Ref

 T3

68 (2.2)

7.739

3.352–17.864

 T4

146 (16.0)

66.355

29.207–150,749

Nodal stage

< 0.001

 N0

55 (2.0)

Ref

Ref

 N1

75 (3.5)

1.816

1.277–2.584

 N2

120 (9.4)

5.134

3.704–7.116

Tumor histology

< 0.001

 Adenocarcinoma

224 (3.8)

Ref

Ref

 Mucinous adenocarcinoma

48 (9.6)

2.680

1.934–3.714

 Signet ring cell carcinoma

21 (29.2)

10.369

6.131–17.537

Weight category

0.005

 1. (BMI < 18.5); underweight

9 (7.4)

1.377

0.683–2.775

 2. (BMI 18.5–25); normal weight

135 (5.5)

Ref

Ref

 3. (BMI 25–30); overweight

108 (4.1)

0.733

0.565–0.950

 4. (BMI > 30); obesity

41 (3.3)

0.589

0.412–0.841

Synchronous systemic metastasis

< 0.001

 No

108 (2.0)

Ref

Ref

 Yes

185 (16.6)

9.638

7.526–12.344