Table 1 Distribution of patients’ characteristics and prognosis analysis

Gender

  Female

314(45.1)

87(42.4)

Ref.

100(41.7)

Ref.

  Male

383(54.9)

118(57.6)

1.24

0.94–1.64

0.13

140(58.3)

1.29

1.00–1.67

0.06

Age

  <60

358(51.4)

99(48.3)

Ref.

123(51.3)

Ref.

  ≥60

339(48.6)

106(51.7)

1.05

0.80–1.39

0.72

117(48.8)

0.91

0.70–1.17

0.45

Hospital site

  Tangdu

454(65.1)

126(61.5)

Ref.

140(58.3)

Ref.

  Xijing

243(34.9)

79(38.5)

1.01

0.75–1.36

0.93

100(41.7)

1.25

0.95–1.64

0.11

Tumor position

  Colon

319(45.8)

93(45.4)

Ref.

108(45.0)

Ref.

  Rectum

378(54.2)

112(54.6)

1.08

0.82–1.42

0.60

132(55.0)

1.05

0.81–1.36

0.70

TNM stage

  I + II

453(65.0)

96(46.8)

Ref.

120(50.0)

Ref.

  III + IV

244(35.0)

109(53.2)

3.82

2.75–5.33

<0.001

120(50.0)

3.13

2.32–4.23

<0.001

Tumor differentiation

  Well

142(20.4)

35(17.1)

Ref.

45(18.8)

Ref.

  Moderate/poor

555(79.6)

170(82.9)

1.38

0.94–2.03

0.10

195(81.3)

1.26

0.89–1.78

0.19

Treatment after surgery

  None

169(24.2)

59(28.8)

Ref.

64(26.7)

Ref.

  Chemotherapy

528(75.8)

146(71.2)

0.36

0.25–0.52

<0.001

176(73.3)

0.45

0.32–0.63

<0.001