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. 2016 Mar 3;11(3):e0150499. doi: 10.1371/journal.pone.0150499

Fig 3. The prevalence of HBV assessed by seropositivity levels of HBsAg and anti-HBc and the seroprotective level of anti-HBs.

Fig 3

Individuals were divided into seven age groups (<5, 5–10, 11–20, 21–30, 31–40, 41–50 and 51–60 years plus). The proportions of individuals positive for HBsAg (A), anti-HBs (B), and anti-HBc (C) are shown on the y-axis. The age at which EPI began is denoted by a vertical line. The ‘before EPI’ group was defined as individuals > 22–24 years of age (depending on the province). The ‘after EPI’ group was defined as individuals < 22–24 years of age.