Fig. 4: Incidence rates of hepatitis B infection and HBsAb seropositive rates and titers in different age groups.
From: Retrospective cohort study of hepatitis B immunization strategy effects in Beijing across 30 years
A The Join-point regression of annual incidence rates of hepatitis B infection in different age groups. B HBsAb seropositive rates in different stages in three surveys conducted in 2006, 2014 and 2020. C HBsAb titers in different stages in three surveys conducted in 2006, 2014 and 2020. The numbers of participants testing for HBsAb seropositive rates and antibody titers in the years of 2006, 2014 and 2020 was 193, 95 and 87 for the 8–12 years, 250, 223 and 19 for the 13–17 years, and 278, 607 and 53 for the 19–23 years. The HBsAb positive rate and the upper limit of 95% confidence interval were presented. The HBsAb geometric mean titer and the upper limit of 95% confidence interval were presented. Two-sided chi-square test is used to compare the HBsAb positive rates among three groups. Kruskal-Wallis H test is used to compare the HBsAb geometric means of the three groups. A P-value less than 0.02 was considered statistically significant after adjustments for three comparisons. HBsAb, hepatitis B surface antibody.
