Education in States and Nations: 1991
For the European Community, births are recorded in the country of the mother's residence at the time of the birth, regardless of the actual location of the birth.
Births by age of mother are published in completed years for three countries (Greece, Ireland and the United Kingdom), and by the age reached in the calendar year for all others.
The method for converting rates by age in completed years into rates by age reached in the calendar year is described in G. Calot's Measurement of rates in demographic studies - age in completed years or age reached during the calendar year. Impact of the choice of definition. Application to general fertility (France, 1946-1981), INED, Travaux et Documents, No. 104, 1984.