Associations between interleukin-1 polymorphisms and gastric cancers among three ethnicities

Table 2 Selective characteristics and risk factors in patients with gastric cancer and controls from the Tibet, Hui and Han ethnicities n (%)

Variable		Tibet				Hui				Han
		Cases(n = 155)	Controls(n = 210)	χ2	P value	Cases(n = 158)	Controls(n = 205)	χ2	P value	Cases(n = 197)	Controls(n = 202)	χ2	P value
Age, yr	< 35	3 (1.94)	5 (2.38)	0.006	0.940	2 (1.27)	2 (0.980)	0.069	0.793	5 (2.54)	5 (2.48)	0.602	0.437
	35-60	82 (52.90)	110 (52.38)	0.010	0.921	75 (47.46)	102 (49.76)	0.187	0.665	98 (49.75)	106 (52.48)	0.297	0.586
	≥ 60	70 (45.16)	95 (45.24)	0.000	0.988	81 (51.27)	101 (49.24)	0.142	0.706	94 (47.71)	91 (45.04)	0.285	0.593
Gender	Male	116 (74.84)	154 (73.33)	0.105	0.746	116 (73.42)	148 (71.20)	0.067	0.795	146 (74.62)	151 (74.75)	0.003	0.952
	Female	39 (25.16)	56 (26.67)			42 (26.58)	57 (28.80)			50 (25.38)	51 (25.25)
Smoking	Yes	99 (63.87)	135 (64.29)	0.007	0.935	28 (17.71)	40 (19.51)	0.188	0.665	131 (66.50)	129 (63.86)	0.200	0.655
	No	56 (36.13)	75 (35.71)			130 (82.29)	165 (80.49)			66 (33.50)	73 (36.14)
Hp	Positive	101 (65.16)	112 (53.33)	5.134	0.023	100 (63.29)	95 (46.34)	10.311	0.001	124 (62.94)	105 (51.98)	4.903	0.027
	Negative	54 (34.84)	98 (46.67)			58 (36.71)	110 (53.66)			73 (37.06)	97 (48.02)