Estimating the Force of Infection with Helicobacter pylori in Japan

Table 1

Model comparison of the time- and age-dependent force of infection to capture the transmission dynamics of Helicobacter pylori in Japan.

Model identity	Functional assumption	Number of parameters	AIC
Model 1	Time-dependent FOI with an exponential decay	3	937.2
Model 2	Time-dependent FOI with a Gompertz-type decay	4	3856.3
Model 3	Time- and age-dependent FOI with an exponential time-decay and exponential age-decay	4	2750.5

AIC: Akaike information criterion; FOI: force of infection.