Table 1.

SIR of stomach cancer by selected characteristics, Valdivia, Chile, 1998-2002

Characteristic	Cases	Males: 365			Females: 164			Male vs female
		%	SIR	95% CI	%	SIR	95% CI	RR	P-value
All	529	69	40.8	36.7-45.2	31	14.8	12.1-16.7	2.8	< 0.001
Age (yr)
< 35	8	0.8	0.5	0.0-1.2	3.0	0.9	0.1-1.8	0.6	0.45
35-44	22	4.4	11.7	5.9-17.4	3.6	4.6	0.9-8.2	2.6	0.04
45-54	55	11.2	44.6	30.9-58.2	8.4	15.4	7.3-23.4	2.9	< 0.001
55-64	94	21.4	125.7	97.8-153.6	9.6	23.9	12.2-35.6	5.3	< 0.001
65-74	164	32.1	291.3	238.6-344.0	28.7	100.5	72.1-128.9	2.9	< 0.001
75-84	86	14.8	448.7	329.3-568.1	19.8	214.3	141.3-287.4	2.1	0.001
≥ 85	100	15.3	501.4	370.4-632.4	26.9	292.2	206.9-377.4	1.7	0.006
Ethnicity Mapuche	89	15	47.2	34.5-59.9	21.0	28.1a	18.5-37.7	1.7	0.016
Hispanic/European	440	85	40.0	35.5-44.5	79.0	12.7a	10.5-15.0	3.1	< 0.001
School years
≤ 8	420	81	43.3a	38.1-48.5	92.0	16.2a	13.3-19.1	2.7	< 0.001
> 8	77	19	27.6a	20.5-34.7	8.0	3.7a	1.5-5.9	7.5	< 0.001
Residence rural	220	48	48.0a	40.7-55.3	30.0	14.5	10.4-18.7	3.3	< 0.001
Urban	297	52	34.5a	29.5-39.6	70.0	13.9	11.2-16.6	2.5	< 0.001

^aSignificant risk factors between characteristics groups; RR: Relative risk.