Gastric cancer risk in relation to tobacco use and alcohol drinking in Kerala, India - Karunagappally cohort study

Table 5 Gastric cancer risk in relation to alcohol drinking among men

	Person-years	Gastric cancer cases	RR	95%CI	P value
Type of alcohol
Never drinker	454152	51	1.0	Reference	> 0.51
Former drinker	98248	16	0.9	0.5-1.7
Toddy	10404	3	2.3	0.7-7.3
Arrack	60956	12	1.7	0.9-3.3
Foreign	63835	7	1.4	0.6-3.3
Combination	209740	27	1.2	0.7-1.9
Other	3384	0	0.0
Duration of alcohol consumption					> 0.52
Never	454553	51	1.0	Reference
1-14	148811	14	1.8	1.0-3.3
15-29	176222	19	1.0	0.5-1.6
30-44	71460	26	1.4	0.9-2.3
≥ 45	11079	1	0.3	0.0-2.5
Unknown	38596	5	1.3	0.5-3.2
Age at start of alcohol drinking					0.1792
< 25	146010	15	1.0	0.5-1.7
≥ 25	166508	29	1.6	1.0-2.6
Never	454553	51	1.0	Reference
Unknown	35400	5	1.5	0.6-3.7

¹The P for heterogeneity;

²The P for trend (those in unknown categories were excluded).