the reproductive age groups used for maternal mortality estimates
reproductive_age_groups.RdMaternal and pregnancy-related mortality quantities are conventionally defined over women of reproductive age, 15 to 49. This function is the single definition of those age groups, so that the respondent age distribution (get_ego_age_distn) and the age-specific estimates being aggregated (aggregate_maternal_estimates) cannot drift apart.
Details
The labels match the ones produced by cut(..., right=FALSE) and by
make.even.age.groups, which is what both the ego age
categories (age.cat) and the estimate age groups (sib.age) use.