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Table 1 Variables used to define the age classes in the epidemic model; c = children, a = adults

From: Age-specific contacts and travel patterns in the spatial spread of 2009 H1N1 influenza pandemic

Variable Definition
α Children fraction of the population
q a , q c Average number of contacts per unit time established by individuals in the children and adult classes, respectively
η = q a /q c Ratio of the average number of contacts
ε = ε c α = ηε a (1 − α) Total fraction of contacts across age classes
r Children fraction of the traveling population