Figure 1

Prevalence of Hepatitis B surface antigen by age, sex and study area. Hepatitis B surface antigen (HBsAg) prevalences displayed (95% CI) are standardized by age (10-year categories) and study site (ten sites) among men and women separately, stratified by urban or rural location. (a) HBsAg prevalence in men by age category, (b) HBsAg prevalence in women by age category, (c) HBsAg prevalence in men by study site, (d) HBsAg prevalence in women by study site. HBsAg, hepatitis B surface antigen.