Age specific Fertility rate of woman aged 15-19 years per 1000 women in that age group. (Numerators for the ASFRs are calculated by identifying live births that occurred in the period 1 to 36 months preceding the survey (determined from the date of the interview and the date of birth of the child); they are then classified by the age of the mother (in five-year groups) at the time of the child’s birth. The denominators for these rates are the number of woman-years lived by the survey respondents in each of the five-year age groups during the specified period. )