Risk factors and gene polymorphisms of inflammatory bowel disease in population of Zhejiang, China

Table 3 Univariate logistic regression analysis of risk factors for inflammatory bowel disease

Variables	χ2	P	RR	95% CI
				Lower bound	Upper bound
Habitat condition during the past 5 yr	1.192	0.274	0.653	0.303	1.404
Educational background	1.250	0.265	0.724	0.284	1.528
Occupation classification	0.894	0.293	0.615	0.314	1.412
Alcoholic drinking	0.987	0.361	0.712	0.194	1.512
Cigarette smoking	1.215	0.194	0.843	0.247	1.384
Tea drinking	1.523	0.165	0.631	0.315	1.423
Stress	18.452	< 0.001	1.295	1.151	1.457
Milk intake	25.425	< 0.001	1.279	1.162	1.407
Fried food intake	24.378	< 0.002	1.286	1.154	1.417

RR: Risk ratio; CI: Confidence interval.