Table 2 Univariate tests for risk factors for DFS and OS

Age (years)

 < 60

1

1

 ≥ 60

0.702

0.66–1.84

0.544

0.45–1.52

Sex

 Male

1

1

 Female

0.198

0.41–1.21

0.158

0.33–1.20

Type of resection

 Laparotomy

1

1

 Laparoscopy

0.005^*

0.24–0.78

0.006^*

0.20–0.76

Tumor sites

 Right

1

1

 Left

0.897

0.50–1.84

0.270

0.28–1.42

Histological grade

 Well + moderate

1

1

 Poor

0.060

0.97–3.62

0.052

0.99–4.34

Tumor morphology

 Ulcerated type

1

1

 Protruded type

0.044^*

0.21–0.98

0.029^*

0.11–0.89

 Mixed + Unknown

0.932

0.52–1.83

0.807

0.54–2.19

Mucinous constituent

 Without

1

1

 With

0.290

0.75–2.66

0.276

0.72–3.14

Tumor deposits

 Without

1

1

 With

 < 0.001^*

3.35–10.70

 < 0.001^*

2.58–9.67

CEA level

 Normal

1

1

 Elevated

 < 0.001^*

1.73–4.86

 < 0.001^*

1.94–6.70

Combined T stages

 T₁ + T₂

1

1

 T₃ + T₄

0.001^*

2.13–16.21

0.004^*

2.00–34.12

Combined N stages

 N₀

1

1

 N₁ + N₂

 < 0.001^*

2.19–6.38

 < 0.001^*

1.86–6.52

TNM stages

 I + II

1

1

 III

 < 0.001^*

2.23–6.42

 < 0.001^*

1.85–6.39

PDS

 0

1

1

 1

0.005^*

0.24–0.77

0.003^*

0.18–0.70

 2

 < 0.001^*

0.14–0.54

 < 0.001^*

0.05–0.32