The
DHS collects information on births and survival status in a
retrospectivemanner. Information on birth histories permits
direct estimation of age-specific fertility rates (ASFRs) (agespecific
fertility rates (ASFRs) are calculated by dividing the
number of births to women in a specific age group by the
number of woman-years lived during a given period) and
the total fertility rate (TFR) (the total fertility rate (TFR) is
defined as the average number of children a woman would
have if she went through her entire reproductive period,
from 15 to 49 years, reproducing at the prevailing ASFRs)