Table 6 Multivariate Cox model analyses of prognostic factors of CRC in non-operated group

Years of diagnosis

<0.001

1996-2000

1.000

Reference

2001-2005

0.869

0.840-0.899

Sex

0.881

Male

1.000

Reference

Female

0.997

0.965-1.031

Site

<0.001

Colon

1.000

Reference

Rectum

0.842

0.814-0.872

Age

<0.001

15-30

0.975

0.761-1.251

0.845

31-40

0.886

0.784-1.002

0.055

41-50

1.021

0.951-1.097

0.567

51-60

1.000

Reference

61-70

1.185

1.121-1.253

<0.001

71-80

1.463

1.388-1.543

<0.001

>80

1.859

1.762-1.961

<0.001

Race

<0.001

Caucasian

1.000

Reference

African American

1.160

1.109-1.214

<0.001

Others*

0.871

0.818-0.927

<0.001

Pathological grading

<0.001

I- II

1.000

Reference

III-IV

1.430

1.365-1.498

<0.001

Unknown

1.141

1.100-1.184

<0.001

Histological Type

0.001

Adenocarcinoma

1.000

Reference

Mucinous/Signet ring cancer

1.112

1.050-1.177

AJCC stage

<0.001

I- II

1.000

Reference

III- IV

7.808

6.260-9.739

<0.001

Unknown

2.735

2.192-3.412

<0.001