Table 2 Multivariable logistic regression analyses for the presence of synchronous peritoneal metastases

Weight category

 1. (BMI < 18.5); underweight

9 (7.4)

1.099

0.477–2.535

0.824

 2. (BMI 18.5–25); normal weight

135 (5.5)

Ref

Ref

Ref

 3. (BMI 25–30); overweight

108 (4.1)

0.955

0.707–1.288

0.761

 4. (BMI ≥ 30); obesity

41 (3.3)

0.840

0.558–1.263

0.401

Primary tumor location

 Right colon

137 (6.9)

1.02

0.759–1.368

0.898

 Left colon

116 (5.0)

Ref

Ref

Ref

 Rectum

26 (1.3)

0.291

0.182–0.464

 < 0.001

Tumor differentiation

 Good/moderate

124 (2.5)

Ref

Ref

Ref

 Poor/undifferentiated

49 (8.8)

1.223

0.814–1.838

0.332

Tumor stage

 T0–2

6 (0.3)

Ref

Ref

Ref

 T3

68 (2.2)

4.203

1.780–9.901

0.001

 T4

146 (16.0)

19.821

8.408–46.72

 < 0.001

Nodal stage

 N0

55 (2.0)

Ref

Ref

Ref

 N1

75 (3.5)

1.185

0.796–1.765

0.402

 N2

120 (9.4)

2.145

1.433–3.212

 < 0.001

Tumor histology

 Adenocarcinoma

224 (3.8)

Ref

Ref

Ref

 Mucinous adenocarcinoma

48 (9.6)

2.337

1.525–3.579

 < 0.001

 Signet ring cell carcinoma

21 (29.2)

4.930

2.481–9.796

 < 0.001

Synchronous systemic metastasis

 No

108 (2.0)

Ref

Ref

Ref

 Yes

185 (16.6)

4.726

3.432–6.508

 < 0.001