Table 2. Odds ratios(OR) and 95% confidence intervals (CI) for the associations between different variables and the seroprevalence of HEV antibodies in the Chinese population in 2005–2006, as found in an univariate logistic regression adjusted by age, gender and in a multivariate logistic regression model.

Variable	Samples tested, no. (pos./neg.)	Univariate analysis			Multivariate analysis
		OR	(95% CI)	P Value	OR	(95% CI)	P Value
HAV antibody (2052 missing)
No	373/5580	Ref.
Yes	1047/6799	1.90	1.41–2.55	<0.0001	1.62	1.22–2.16	0.001
HBV HBsag
No	1552/13937	Ref.
Yes	73/290	0.65	0.34–1.23	0.19	0.75	0.40–1.40	0.37
Region
Eastern	380/4816	Ref.
Middle	365/4924	1.02	0.67–1.55	0.94	0.98	0.63–1.5	0.91
Western	880/4477	2.42	1.14–5.17	0.02	2.85	1.18–6.88	0.02
Urban/Rural
Urban	746/7096	Ref
Rural	880/7130	1.09	0.72–1.64	0.69	0.75	0.49–1.12	0.16
Gender
Female	823/7033	Ref
Male	802/7194	1.19	0.73–1.95	0.48	1.52	0.95–2.44	0.08
Age group(yrs)
1–14	694/11096	Ref.
15–60	931/3131	5.42	4.37–6.72	<0.0001	3.86	2.58–5.78	0.001
Occupation
Children	173/4904	0.29	0.15–0.58	0.0004	1.78	0.67–4.76	0.25
Student	642/7153	0.53	0.34–0.83	0.005	0.80	0.41–1.57	0.51
Farmer	517/1290	2.08	1.33–3.25	0.001	2.78	1.47–5.30	0.002
Worker	98/285	1.30	0.88–1.94	0.19	1.34	0.88–2.03	0.17
Others	195/595	Ref.