Analysis of reported incidence of chronic hepatitis B in Chaoyang District, Beijing during 2005-2022 with age-period-cohort model.

Overall, the reported incidence rates across all age groups in the population demonstrated a decreasing trend over time, although the rates for the 20–24, 30–39, 45–49, 55–59, 65–69, and 70–74 age groups in 2020 showed a slight increase compared to those in 2015 ( Figure 6 ). 3.3 The analysis of APC model Comparison of age-period-cohort models, including the traditional two-factor models (age-period, age-cohort, and period-cohort) fit for the reported incidence data of chronic hepatitis B in the whole population, men, and women showed the best fit of the APC model (Variance = 53.20, AIC = 7.34, BIC = −33.72) ( Table 1 ).

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