Table 1.

Characteristics of study subjects

	Cases		Controls
	No.	%	No.	%
Age group
≤61	113	37.4	152	36.1
62–69	99	32.8	139	33.0
≥70	90	29.8	130	30.9
Gender
Male	200	66.2	272	64.6
Female	102	33.8	149	35.4
Educational levels
≤High school	143	47.3	156	37.1
Some college	102	33.8	145	34.4
≥College	57	18.9	120	28.5
Family history of gastric cancer
No	177	61.0	276	66.7
Stomach	36	12.4	18	4.3
Other	77	26.6	120	29.0
H. pylori infection status1
Negative	51	16.9	64	15.2
Positive	251	83.1	356	84.8
Current alcohol drinking
No	202	68.5	200	47.5
Yes	93	31.5	221	52.5
Current smoking
No	177	59.0	303	72.0
Yes	123	41.0	118	28.0
Age smoking started
Never	87	29.2	169	40.2
20–73	86	28.9	129	30.6
11–19	125	41.9	123	29.2
Pack-years of smoking
0	87	29.1	169	40.3
0.1–30	90	30.1	132	31.4
>30–162	122	40.8	119	28.3
Fruit intake
Daily/weekly	131	46.0	203	48.3
Several times/month	102	35.8	140	33.3
Rarely/never	52	18.2	77	18.4
Vegetable intake
Daily/weekly	141	49.3	251	60.2
Several times/month	110	38.5	126	30.2
Rarely/never	35	12.2	40	9.6
Dietary folate intake (tertile) (μg/day)
93.2–268.1	67	26.3	134	32.9
268.2–342.4	86	33.9	135	33.2
342.5–678.5	101	39.8	138	33.9
Dietary vitamin B6 intake (tertile) (μg/day)
≤0.6	96	37.8	134	32.9
>0.6–0.7	87	34.3	135	33.2
>0.7	71	27.9	138	33.9
Total protein intake (tertile) (g/day)
≤91.8	74	29.1	134	32.9
91.9–119.6	94	37.0	135	33.2
>119.6	86	33.9	138	33.9

¹Negative, tested negative for both IgG antibodies to H. pylori and cagA; positive, tested positive for either IgG antibodies to H. pylori or cagA antibody, or both.