Population demographic parameters for H. pylori from Baka Pygmies and non-Baka agriculturalists derived using an isolation-with-migration model and assuming two demographically explicit scenarios.

Population parameter theta (θ) = 4N1μ, where N1 is the effective population size of the reference population (non-Baka) and μ is the mutation rate. t is the timing parameter in coalescent units, and T the time to split between Baka and non-Baka (). m is the fraction of the population replaced by migrants per generation: of population 1 (non-Baka) are replaced per generation and of population 2 (Baka) are replaced per generation. The θ estimated by the software refers only to population 1. c.i., confidence interval; L, lower; U, upper.