Polymorphism of CYPIA1 and GSTM1 genes associated with susceptibility of gastric cancer in Shandong Province of China

Table 1 Distribution of cases and controls by age, sex, education, and occupation

Variable	Value level	Gastric group		Control group		χ2	P
		n	%	n	%
Age (yr)	<35	4	3.9	18	29
	35-	13	12.7	21	33.9
	45-	85	83.3	23	37.1	38.945	<0.001
Sex	Male	86	84.3	33	53.2
	Female	16	15.7	29	46.8	18.718	<0.001
Education years	<5	57	55.9	14	22.6
	6-	29	28.4	28	45.2
	13-	16	15.7	20	32.3	17.807	<0.001
Occupation	Farmer	63	61.8	24	38.7
	Worker	21	20.6	18	29
	Card	18	17.6	20	32.3	8.573	0.014