Seroepidemiology of hepatitis B virus infection and impact of vaccination

Table 3 Risk factors associated with hepatitis B surface antigen positivity among population aged 1-19 years

Variables	uaj. OR (95%CI)	P value	aj. OR (95%CI)	P value
Age group (yr)
5-9 vs 1-4	0.91 (0.45-1.86)	0.805	1.14 (0.52-2.54)	0.740
10-14 vs 1-4	1.84 (0.93-3.63)	0.078	1.18 (0.86-3.21)	0.095
15-19 vs 1-4	3.39 (1.74-6.60)	< 0.001	4.12 (1.93-8.75)	< 0.001
Sex (female vs male)	0.89 (0.74-1.07)	0.218	-	-
Immunization history of HBV (yes vs no)	0.50 (0.35-0.70)	< 0.001	0.71 (0.49-0.98)	0.028
Familial history of HBV (yes vs no)	2.52 (1.83-3.49)	< 0.001	2.00 (1.88-2.13)	< 0.001

aj. OR: Logistic regression analyses adjusted for age group, familial history of HBV, and immunization history of HBV; uaj.: Unadjusted.