Table I.

Clinical characteristics of gastric cancer patients and healthy controls.

Characteristic	Cases, n	Controls, n	P-value
Gender			0.885
Male	112	169
Female	41	64
Age (years)			0.209
≤60	61	108
>60	92	125
Tumor size (diameter)
≤6 cm	76
>6 cm	77
Tumor location
Upper	55
Middle	47
Lower	51
Lymph node metastasis
N0	43
N1	36
N2	34
N3	40
Clinical stages
I+II	46
III+IV	90
Extent of differentiation
Moderate	96
Poor	57
Pathological subtype
Diffuse	100
Intestinal	27
Mixed	26