Training set (n=162) Testing set (n=176) P-value
  CRC (n=55) Non-CRC (n=107) P-value CRC (n=56) Non-CRC (n=120) P-value Cases Controls
Age, yr (S.E.) 66.47 (1.50) 68.31 (1.12) 0.335 67.38 (1.83) 69.99 (1.03) 0.216 0.704 0.270
Gender, no. (%)
Male
Female

32 (58.2)
23 (41.8)

58(54.2)
49(45.8)

0.630

28 (50.0)
28 (50.0)

73 (60.8)
47 (39.2)

0.176

0.387

0.313
Stage, no. (%)
I
II
III
IV

21 (38.2)
10 (18.2)
14 (25.5)
10 (18.2)

-
-
-
-

-

15 (26.8)
9 (16.1)
21 (37.5)
11 (19.6)

-
-
-
-

-

0.447

-
Tumor site, no. (%)
Colon
Rectum
Cecum
Colon+Rectum

28 (50.9)
22 (40.0)
4 (7.3)
1 (1.8)

-

-

30 (53.6)
16 (28.6)
5 (8.9)
5 (8.9)

-

-

0.286

-
CRC: ColonRectal Cancer; *Data are given as means (SE) or as the number of cases (%); §P values were estimated using the t-test
Table 1: Characteristics of the training and testing sets*§.