Table 1.

Distribution of gastric cases and controls according to study centre, sex, age and other selected variables in the Stomach cancer Pooling (StoP) Project consortium.

	Cases (n = 6097)		Controls (n = 13,017)
	N	%a	N	%a
Study (StoP ID. Country (Reference))
Europe
03. Italy 1 [25]	230	3.8	547	4.2
05. Italy 2 [26]	1016	16.7	1159	8.9
06. Greece 1 [24]	110	1.8	100	0.8
09. Russia [30]	450	7.4	611	4.7
17. Portugal [29]	692	11.3	1667	12.8
21. Spain 1 [27]	441	7.2	3440	26.4
23. Spain 2 [28]	401	6.6	455	3.5
33. Greece 2 [23]	82	1.3	410	3.1
Asia
02. China 1 [35]	266	4.4	533	4.1
08. China 2 [33]	206	3.4	415	3.2
10. Iran 1 [31]	217	3.6	394	3.0
11. Iran 2 [32]	286	4.7	304	2.3
12. China 3 [34]	711	11.7	711	5.5
30. Japan [36]	153	2.5	303	2.3
The Americas
25. Mexico 1 [37]	248	4.1	478	3.7
26. Mexico 2 [38]	220	3.6	752	5.8
36. Brazil	368	6.0	738	5.7
Sex
Men	3870	63.5	7423	57.0
Women	2227	36.5	5594	43.0
Age (years)
<40	288	4.7	671	5.2
40–44	245	4.0	724	5.6
45–49	387	6.3	1008	7.7
50–54	539	8.8	1265	9.7
55–59	761	12.5	1588	12.2
60–64	904	14.8	1947	15.0
65–69	1111	18.2	2155	16.6
70–74	1063	17.4	1888	14.5
≥75	799	13.1	1771	13.6
Socioeconomic statusb
Low	3647	60.6	6275	48.6
Intermediate	1764	29.3	4213	32.6
High	603	10.0	2416	18.7
Smoking habitsb
Never smoker	2791	46.6	6397	49.9
Former smoker	1478	24.7	3203	25.0
Current smoker, number of cigarettes/day
≤10	475	7.9	1231	9.6
>10–20	672	11.2	1076	8.4
>20	574	9.6	912	7.1
Alcohol drinking (g/day)b
Never	1488	30.4	3716	33.5
≤12	983	20.1	3353	30.2
>12–47	1657	33.9	2907	26.2
>47	759	15.5	1111	10.0
Family history of gastric cancerb,c
No	2814	79.5	7348	91.4
Yes	726	20.5	692	8.6
Total fruit and vegetables intakeb,d
Low	1905	32.4	3485	28.6
Intermediate	1987	33.8	4172	34.2
High	1985	33.8	4545	37.2

^aPercentages may not add to 100 due to rounding.

^bFrequencies do not sum up to the total beacuse of missing values.

^cIn first degree relatives.

^dBased on study-specific tertiles.