Figure 2. Duration of economic benefits.

Economic benefits are calculated only for the benefit cohort population receiving MDA between 2000–2007; however, the benefits are gained until the end of their lifetime. For modeling purposes, single average ages were used to encompass the entire age range of individuals in each population subgroup, realizing that some individuals will be above this average age at the time of treatment, and some below. The size of each subgroup decreases each year based on country and age-specific mortality rates.