Table 1. Basic demographic data of subjects and clinical characteristics of GC cases.

Parameters	Case		Control		P
	n	Frequencies (%)	n	Frequencies (%)
Age (year, mean ± SD)	56.5±12.1		56.2±12.2		0.727
Gender
Male	418	66.6	323	64.3	0.577
Female	210	33.4	179	35.7
Smoking Status
Non-smokers	365	58.1	297	59.2	0.297
Former Smokers	139	22.1	125	24.9
Current Smokers	124	19.7	80	15.9
Drinking status
Non-drinker	437	69.6	348	69.3	0.631
Light Drinkers	93	14.8	66	13.2
Heavy Drinkers	98	15.6	88	17.5
Tumor size (diameter)
<5 cm	207	33.0
5-10 cm	204	32.5
≥10 cm	56	8.9
N.A.	161	25.6
Tumor stages
1a	64	10.2
1b	36	5.7
2a	41	6.5
2b	72	11.5
3a	55	8.8
3b	71	11.3
3c	109	17.4
4	180	28.7
Degree of differentiation
Low	433	68.9
Medium	185	29.5
High	10	1.6
Lymphatic metastasis
0	151	24.0
1	103	16.4
2	109	17.4
3a	124	19.7
3b	61	9.7
N.A.	80	12.7

N.A. data not available.