Table 6.

Multivariable analysis of the risk factors associated with anti-HEV IgG in Zhangqiu county and Rushan county, Shandong province, China

	Zhangqiu			Rushan
	Participant number	P	OR (95% CI)	Participant number	P	OR (95% CI)
Gender
Male	1049	Ref.	Ref.	1041	Ref.	Ref.
Female	1006	0.05	0.72 (0.52,0.98)	1006	< 0.001	0.71 (0.58,0.86)
Age (yrs)
Under 30	97	Ref.	Ref.	138	Ref.	Ref.
30–39	331	0.54	0.71 (0.24,2.10)	158	< 0.001	3.38 (1.87,6.11)
40–49	559	0.46	1.45 (0.54,3.88)	479	< 0.001	4.64 (2.74,7.86)
50–59	460	0.41	1.53 (0.56,4.17)	667	< 0.001	4.17 (2.49,6.99)
60–69	396	0.02	3.22 (1.18,8.73)	433	< 0.001	5.47 (3.20,9.35)
Above 70	212	< 0.001	8.62 (3.08,24.15)	172	< 0.001	4.49 (2.45,8.22)
Education attainment
Illiteracy	227	Ref.	Ref.	115	Ref.	Ref.
Primary school	739	0.246	1.32 (0.83,2.09)	560	0.025	1.66 (1.06,2.60)
Junior middle school	972	0.676	1.12 (0.64,1.96)	1121	0.037	1.63 (1.03,2.58)
Senior middle school and above	117	0.715	1.18 (0.48,2.92)	251	0.033	1.76 (1.04,2.96)
Occupation about swine laughter or selling
Yes	11	Ref.	Ref.	61	Ref.	Ref.
No	2044	0.122	0.29 (0.06,1.39)	1986	0.654	1.13 (0.66,1.93)
Occupation about seafood cultivation, processing or selling
Yes	0	–	–	43	Ref.	Ref.
No	2055	–	–	2004	0.103	0.59 (0.31,1.11)
Wash hands before dining
≧2 times per day	2015	Ref.	Ref.	1877	Ref.	Ref.
≦one time per day	40	0.506	0.61 (0.14,2.63)	170	0.984	1.00 (0.72,1.39)
Drinking unboiled water
≧3 times per week	51	Ref.	Ref.	143	Ref.	Ref.
1–2 times per week	417	0.637	1.32 (0.42, 4.12)	214	0.12	0.69 (0.44,1.09)
Less than once per week	1587	0.673	1.27 (0.42, 3.87)	1690	0.6	0.91 (0.63,1.31)
Eating outside
≧3 times per week	94	Ref.	Ref.	98	Ref.	Ref.
1–2 times per week	611	0.926	1.04 (0.47,2.29)	140	0.924	0.97 (0.55,1.72)
Less than once per week	1350	0.644	0.83 (0.38,1.81)	1809	0.34	1.25 (0.79,1.96)
Chronic hepatitis B infection
Yes	1026	Ref.	Ref.	1022	Ref.	Ref.
No	1029	0.187	1.23 (0.90,1.68)	1025	0.609	1.05 (0.87,1.26)