Fertility rates by mother’s age: The ratio of the number of live births to mothers of age x to the average female population of age x.

Crude birth rate : The ratio of the number of live births during the year to the average population in that year. The value is expressed per 1 000 population. Total fertility rate : Mean number of children that would be born alive to a woman during her lifetime if she were to pass through and survive her childbearing years conforming to the fertility rates by age of a given year.