Seroepidemiology of hepatitis B virus infection and impact of vaccination

Table 2 Prevalence of hepatitis B surface antigen by other demographic and selected variables in Eastern China

Variables	HBsAg negative (n = 137462)	HBsAg positive (n = 11469)	Prevalence (%, 95%CI)	P value
Marital status (≥ 20 yr)				< 0.001
Unmarried	6127	487	7.36 (6.75-8.02)
Married	96383	10012	9.41 (9.24-9.59)
Divorced	5808	456	7.28 (6.65-7.95)
Education (≥ 20 yr)				< 0.001
Illiterate or primary school	61819	6733	9.82 (9.60-10.05)
Middle school	39830	3630	8.35 (8.09-8.62)
College school	6526	571	8.05 (7.42-8.70)
Occupation (≥ 20 yr)				< 0.001
Agricultural worker	36186	4177	10.35 (10.05-10.65)
Worker	36717	3813	9.41 (9.13-9.70)
Student	1163	85	6.81 (5.48-8.35)
Civil servant	4672	457	8.91 (8.14-9.72)
Public service worker	4749	473	9.06 (8.29-9.87)
Unemployed	20297	1466	6.74 (6.41-7.08)
Others	4411	472	9.67 (8.85-10.53)
Immunization history of HBV				< 0.001
No	68111	7757	10.22 (10.01-10.44)
Yes	48430	1803	3.59 (3.43-3.76)
Familial history of HBV
No	123472	9525	7.16 (7.02-7.30)	< 0.001
Yes	10319	1697	14.12 (13.50-14.76)

HBsAg: Hepatitis B surface antigen.