Age , hepatitis B infection and risk of anti hepatitis B surface antigen

As part ofa community-basedhepatitis survey inJakarta, this paper measures the prevalence ofanti hepatitis B surface antigen (anti-HBs), and identifies the related risk markers. Sample consisted of 995 people aged 15 yeais and above. Risk markers were identffied by questionnaires and home visits, and serum was analyzed for anti-HBs, hepatitis B suryace antigen (HBsAil, aspartrte aminotransferase (AST), andalanine aminotransferase (ALT). Inarelatively higher educatedpopulatiàn, the seroprevaLenà of aiti-HBs positive was 17 '5qo ( 174/995 ), and HBsAg positive was 4.1Eo (41/995 ). A positive of HBsAg reduced the riskof positive anti-HBs (adjusted odds ratio=OR= 0.24,95Vo CI:0.06-1.00; p=0.051). Comparedto l5-Igyears age group, therewas a significantpositive tr"id thot oLder age groups had increased risk of having anti-HBs positive (p=0.004), and reach its peak among aged 30_39 years and 40_49 '86; 95% CI: 2.19; 95Vo CI: I.2l-3.69 respectively). Afrerward the riskwas decreasing ersons' In con a relatively well educàted population of anti-HBs was moderate. A positive was lowering and the older age had a trend of higher risk of having anti-HBs po,sitive.