Live births: Births of children that showed any sign of life. It is the number of births excluding stillbirths (total births include live births and stillbirths).

Stillbirth: The expulsion or extraction from the mother of a dead foetus after the time at which it would normally be resumed capable of independent extrauterine existence (commonly taken to be after 24 to 28 weeks of gestation).

Crude birth rate: The ratio of the number of live births during the year to the total population in that year. The value is expressed per 1000 inhabitants.

Mean age of women at childbirth: The mean age of women when their children are born.

Total fertility rate: The mean number of children that would be born alive to a woman during her lifetime if she were to pass through her childbearing years conforming to the fertility rates by age of a given year.

Fertility rates by mother's age (age specific fertility rate): The number of births to mothers of age x to the average female population of age x.

Age concept:

Most National Statistical Institutes of the EU Member States provide data on the number of live births by both dimensions: mother's age and mothr's year of birth. Live births are compiled and disseminated, based on the data collected, as follows: by mother's age at last birthday (also referred as age completed) and by mother's age reached during the year. The availability of data on live births by the two concepts among the countries starts at different moment of time series.

Eurostat uses the concept of age completed for the calculation of the fertility indicators.