Table 2.

Distribution of gastric cancer cases and controls according to sex, age and other selected covariates.

	Cases		Controls
	N	%	N	%
Sex
Male	7,448	65.1	16,650	59.4
Female	3,995	34.9	11,379	40.6
Age
<40	496	4.3	2,113	7.5
40–45	479	4.2	1,679	6.0
45–50	781	6.8	2,254	8.0
50–54	1,128	9.9	2,969	10.6
55–59	1,538	13.4	3,552	12.7
60–64	1,803	15.8	4,289	15.3
65–69	2,028	17.7	4,525	16.1
70–74	1,824	15.9	3,779	13.5
≥75	1,366	12.0	2,869	10.2
Socioeconomic status [1]
Low	4,486	50.4	8,433	36.8
Intermediate	2,416	27.2	6,955	30.4
High	1,156	13.0	5,099	22.3
Missing	834	9.4	2,415	10.5
History of stomach cancer in first degree relatives [2]
No	6,495	73.2	16,330	79.2
Yes	1,376	15.5	1,982	9.6
Missing	1,007	11.3	2,314	11.2
Vegetables and fruit intake [3]
Low	3,840	33.6	8,515	30.4
Intermediate	3,938	34.4	9,737	34.7
High	3,647	31.8	9,484	33.8
Missing	18	0.2	293	1.1
Total energy intake [4]
1st quintile	1,120	17.2	3,123	19.8
2nd quintile	1,172	18.4	3,133	19.9
3rd quintile	1,228	18.8	3,135	19.9
4th quintile	1,268	19.5	3,136	19.9
5th quintile	1,501	23.1	3,137	19.9
Missing	198	3.1	72	0.5
Body Mass Index (kg/m2) [5]
<18.5	533	4.9	826	3.1
18.5–25	5,605	51.3	13,360	49.4
25–30	2,707	24.8	7,693	28.5
>30	1,446	13.2	3,197	11.8
Missing	639	5.9	1,953	7.2
Cigarette smoking
Never	4,670	40.9	12,787	45.7
Former	3,063	26.8	7,626	27.2
Current (cigarettes/day)
≤10	775	6.8	2,208	7.9
11–20	1,607	14.1	3,164	11.3
>20	1,026	9.0	1,867	6.7
Missing	281	2.5	343	1.2
Alcohol intake
Never	3,810	37.8	10,803	43.5
Low (≤12 g of ethanol/day)	2,423	24.1	5,283	21.3
Intermediate (>12–47 g of ethanol/day)	2,497	24.8	5,582	22.4
High (>47 g of ethanol/day)	1,036	10.3	2,035	8.2
Missing	302	3.0	1,145	4.6

¹No information for the study Japan 2.²³ As defined in each original study based on education, income or occupation.

²No information for the studies Canada,¹⁴ China 3,¹⁶ Mexico 1,²⁶ Mexico 2²⁸ and Mexico 3.²⁷

³Defined according to study-specific tertiles.

⁴No information for the studies Canada,¹⁴ China 2,¹⁵ Russia,³⁰ Iran 1,¹⁸ Japan 2,²³ Brazil 1¹³ and Brazil 2.¹²

⁵No information for the studies Mexico 2, Mexico 3, Brazil 1¹³ and Brazil 2.¹²