| Age Specific Fertility Rate: annual births per 1,000 women in age-group divided by the midyear population of women. |
| Birth interval: time period between two successive live births of one mother. |
| Child Mortality Rate: number of deaths to children under five years of age in a given period divided by the number of children born in the same period; this rate is given per 1,000. |
| Cohort: A sum of persons who experience a certain event within the same period of time (marriage cohort, birth cohort). |
| Crude Birth Rate: the number of births in a given year divided by the total population in the middle of the given year; this rate is given per 1,000. |
| Fecundity: the capacity to reproduce. |
| Fertility: the actual reproductive performance. |
| Life expectancy at age x: mean number of years to be lived beginning at the xth birthday. |
| Postpartum amenorrhoea: absence of menstruation after childbirth. |
| Reproductive span: the time between first menses (menarche) and the cessation of menstruation (menopause) in women. |
| Total Fertility Rate: the sum total of age specific fertility. This rate represents the number of children that would be born per 1,000 females experiencing no mortality. |
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