Table 1.

The distributions of demographic and clinicopathologic characteristics of colorectal cancer patients in the three groups

	Development group	Internal validation group	External validation group	P
Age (years)				0.845#
Mean	63.55	62.78	62.34
SD	11.21	13.31	12.74
Sex				0.134##
Male	129 (64.5%)	62 (53.7%)	56 (62.2%)
Female	71 (35.5%)	72 (46.3%)	34 (37.8%)
T-category				0.161##
T1	1 (0.5%)	0 (0%)	2 (2.2%)
T2	10 (5.0%)	4 (3.0%)	3 (3.3%)
T3	168 (84.0%)	119 (88.8%)	82 (91.1%)
T4	21 (10.5%)	11 (8.2%)	3 (3.3%)
N-category				0.280##
N0	82 (41.0%)	64 (47.8%)	45 (50%)
N1	71 (35.5%)	46 (34.3%)	33 (36.7%)
N2	47 (23.5%)	24 (17.9%)	12 (13.3%)
Stage				0.240##
II	82 (41.0%)	65 (48.5%)	45 (50%)
III	118 (59.0%)	69 (51.5%)	45 (50%)
Tumor site				< 0.001##
Colon	115 (57.5%)	73 (54.5%)	0 (0%)
Rectum	85 (42.5%)	61 (45.6%)	90 (100%)

^#Kruskal–Wallis rank sum test

^##Chi-square test