Table 1.

Demographic and clinical characteristics of patients in validation cohorts

Characteristic	Han ethnic		Kazakh ethnic		P value
	(N = 142)		(N = 86)
	No.	%	No.	%
Age at surgery, years					<0.001
Median	63		58
Range	36–81		34–73
Sex					0.028
Male	107	75.35	53	61.63
Female	35	24.65	33	38.37
Differentiation					0.316
Well	39	27.46	21	24.42
Moderate	74	52.11	53	61.63
Poor	29	20.42	12	13.95
Lymph node metastasis					0.001
No	93	65.49	37	43.02
Yes	49	34.51	49	56.98
TNM					0.485
I + II	94	66.2	53	61.63
III + IV	48	33.8	33	38.37

P < 0.05 indicates a significant association among the variables