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Reference metadata describe statistical concepts and methodologies used for the collection and generation of data. They provide information on data quality and, since they are strongly content-oriented, assist users in interpreting the data. Reference metadata, unlike structural metadata, can be decoupled from the data.

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Fertility (national level) (demo_fer)

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Reference Metadata in Euro SDMX Metadata Structure (ESMS)

Compiling agency: Eurostat, the statistical office of the European Union.

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Eurostat’s annual data collections on demographic and migration statistics are structured as follows:

  • NOWCAST: Annual data collection on provisional monthly data on live births and deaths covering at least six months of the reference year (Article 4.3 of the Commission implementing regulation (EU) No 205/2014).
  • DEMOBAL (Demographic balance): Annual data collection on provisional data on population, total live births and total deaths at national level (Article 4.1 of the Commission implementing regulation (EU) No 205/2014).
  • POPSTAT (Population statistics): The most in-depth annual national and regional demographic and migration data collection. The data relate to populations, births, deaths, immigrants, emigrants, marriages and divorces, and is broken down into several categories (Article 3 of Regulation (EU) No 1260/2013 and Article 3 of Regulation (EC) No 862/2007).

The aim is to collect annual mandatory and voluntary demographic data from the national statistical institutes. Mandatory data are those defined by the legislation listed under ‘6.1. Institutional mandate - legal acts and other agreements’.

The completeness of the demographic data collected on a voluntary basis depends on the availability and completeness of information provided by the national statistical institutes. For more information on mandatory/voluntary data collection, see 6.1. Institutional mandate - legal acts and other agreements’.

The following statistics on live births are collected from the National Statistical Institutes:

  • Live births by month of occurrence;
  • Live births by mother's age, year of birth and by:
    • region (NUTS 2) of residence
    • region (NUTS 3) of residence
    • mother's country of birth
    • mother's country of citizenship
    • live-birth order
    • sex of the new-born
    • mother's legal marital status
    • employment status of the mother
    • mother's educational attainment (ISCED 2011);
  • Live births by birth weight and duration of gestation;
  • Legally induced abortions by mother's age and parity;
  • Late fœtal deaths by mother's age.

Statistics on fertility: based on the different breakdowns of data on live births and on legally induced abortions received, Eurostat produces the following:

  • Statistics available in the online table Population change - Demographic balance and crude rates at national level (demo_gind):
    • natural change of the population, crude birth rate;
  • Statistics available in the online table Fertility indicators (demo_find):
    • the proportion of live births outside marriage
    • total fertility rate
    • the mean age of women at childbirth
    • the mean age of women at the birth of first / second / third / fourth and higher child
    • the median age of women at childbirth
    • the percentage of first / second / third / fourth and higher live births Fertility rates by age (demo_frate);
  • Fertility rates by age and NUTS 2 region (demo_r_frate2);
  • Total fertility rate by NUTS 3 region (demo_r_frate3);
  • Statistics available in the online table Abortion indicators (demo_fabortind):
    • abortion rate
    • abortion ratio
10 March 2025

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

Legally induced abortions: induced expulsion of the foetus during the first part of a pregnancy, permitted by law for health or other reasons.

Late foetal deaths or stillbirths: the expulsion or extraction from the mother of a dead foetus after the time at which it would normally be presumed capable of independent extrauterine existence (commonly taken to be after 24 to 28 weeks of gestation). This does not include infants who are born alive but die shortly after birth.

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 1000 population.

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

Total fertility rate: it is computed by adding the age specific fertility rates for women in a given year. It can be interpreted as 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, and surviving.

Mean age of women at childbirth: the mean age of women when their children are born (live births). The indicator is calculated as weighted average of the ages, where weights are the age specific fertility rates (rate-based mean age).

Median age of women at childbirth: the age that divides the population of mothers at childbirth in two numerically equal groups, meaning half of the mothers are younger than the median age and half are older.

Mean age of women at birth of first child: the mean age of women delivering their first child (live births). The indicator is calculated as weighted average of the ages, where weights are the age specific fertility rates (rate-based mean age).

Mean age of women at birth of second child: the mean age of women delivering their second child (live births). The indicator is calculated as weighted average of the ages, where weights are the age specific fertility rates (rate-based mean age).

Mean age of women at birth of third child: the mean age of women delivering their third child (live births). The indicator is calculated as weighted average of the ages, where weights are the age specific fertility rates (rate-based mean age).

Mean age of women at birth of fourth and higher order child: the mean age of women delivering their fourth or higher order child (live births). The indicator is calculated as weighted average of the ages, where weights are the age specific fertility rates (rate-based mean age).

Abortion rate: The number of abortions per 1000 women in reproductive ages in a given year.

Abortion ratio: The number of abortions per 1000 live births in a given year.

Age definition:

Most National Statistical Institutes of the EU Member States provide data on the number of live births by both dimensions: mother's age and mother'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 (also referred to as data by year of birth).

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 when calculating fertility indicators and mean ages.

The statistical unit used is ''number'', as indicated in the online database or by the title of tables.

The statistical population is the total population. For more information on the population concepts used, please see the reference metadata on Population.

The live births statistics are disseminated by single country, by region and by aggregates of countries, as follows:

  1. The Member States of the European Union and their regional structure as defined in the Nomenclature of territorial units for statistics.
  2. The EU candidate countries and their agreed Statistical Regions following the same rules as the Nomenclature of territorial units for statistics.
  3. The EU potential candidate countries and their agreed Statistical Regions following the same rules as the Nomenclature of territorial units for statistics.
  4. The EFTA countries and their agreed Statistical Regions following the same rules as the Nomenclature of territorial units for statistics.
  5. Other countries: Andorra, Armenia, Azerbaijan, Belarus, Monaco, the Russian Federation, San Marino and the United Kingdom.
  6. The geographical aggregates European Union and Euro Area, on which the dissemination covers at least the current and the previous version of their composition, the European Economic Area (EEA) and the European Free Trade Association (EFTA).

For details on geographical changes over time see the notes by country under 15.2 Comparability over time.

National refers to the territory of a Member State within the meaning of Regulation (EC) No 1059/2003, applicable at the reference time.

Regional refers to NUTS level 1, NUTS level 2 or NUTS level 3 as defined in Regulation (EC) No 1059/2003 and according to the classification in force at the reference time. When this term is used in connection with countries that are not members of the European Union, 'regional' means the statistical regions at level 1, 2 or 3 as agreed between those countries and the Commission (Eurostat), at the reference time.

Statistics from the UK are available only until the withdrawal of the country from the EU.

The reference period for vital events data is the calendar year in which the events occurred. For the monthly time series the reference period is the month of occurrence.

Not available.

Data on live births are disseminated as integer numbers and as rates.

Based on the detailed national figures on population and other demographic events sent to Eurostat by the national statistical institutes, Eurostat derives/calculates demographic indicators and geographical aggregates using common calculation methods.

Geographical aggregation

For statistics on live births expressed in numbers, geographical aggregation is done by arithmetical sum if no values are missing from the components of the geographical aggregate in question. Otherwise the geographical aggregates are not calculated.

For fertility rates, the geographical aggregates are calculated using the same method as for an individual country. The input for calculation is the aggregated data described above.

Data are collected by Eurostat from the National Statistical Institutes.

Data sources of live birth statistics declared by the NSIs:

  • AT: Civil Registry Offices. From 1 November 2014 onwards Central Civil Register.
  • BE: Belgian population register.
  • BG: Population register.
  • BY: Data on births are compiled on the basis of administrative data from birth records filled in by civil registration authorities.
  • CH: Civil status registers.
  • CY: Civil Registry and Migration Department, Health Monitoring Unit (Ministry of Health).
  • CZ: Statistical reports on birth provided to the CZSO by Registry Offices.
  • DE: Information not provided.
  • DK: Population register.
  • EE: Population Register and Estonian Medical Birth Registry.
  • EL: Sources of information for vital statistics are administrative records (Marriage, Birth and Death Certificates) provided by Registries from all around country.
  • ES: Birth data are obtained from the Statistical Birth Bulletin, filled out by the parents, relatives or health staff so obligated by law to declare the childbirth and recorded in the Civil Register.
  • FI: Population Information System of Population Register Centre.
  • FR: Civil status.
  • HR: Data source for births are registers of births kept in registrars’ offices of every particular area.
  • HU: The source of data on live births are civil registrars and health institutions.
  • IE: General Registration Office.
  • IS: Population register(s).
  • IT: Registration for birth in the Municipal Population Registers (Anagrafi).
  • LI: Central Population Register. No major changes since the first reference year.
  • LT: The main data source are data from the central database of the Residents’ Register of the Residents’ Register Service.
  • LU: Municipalities.
  • LV: Data from registers filled in by Civil Registry Offices; data on born abroad (in case, the usual residence of mother is Latvia) from Population Register.
  • ME: The data source is administrative source – Registry Office that is managed by state administration body responsible for internal affairs (Ministry of Interiors).
  • MT: Compilation of births statistics is carried out using administrative data.
  • NL: Population register.
  • NO: Central Population Register.
  • PL: Vital Statistics - administrative data.
  • PT: Administrative records provided by Civil Registration Offices/Ministry of Justice plus information provided by individuals at the time of birth registration act.
  • RO: Administrative data source: Public Community Services for Persons Records within the City Halls of all localities.
  • RS: Registers of births kept in registrars' offices of every particular area.
  • SE: The Total Population Register.
  • SI: National Institute of Public Health, Central Population Register.
  • SK: Exhaustive monthly survey covering all births to mothers with permanent residence in the Slovak Republic. Statistical Report on Birth (OBYV 1-12).
  • UK: Birth statistics are based on information collected when a birth is registered.

Population statistics are continuously revised according to the most recent data released and sent to Eurostat by the national statistical institutes. The geographical aggregates and the demographic indicators are revised accordingly.

The statistics are published in line with the information in 8.1 Release calendar and 17.1 Data revision-policy.

For information on the timeliness of data release, see 8.1 Release calendar.

The recommended definition of the population, in line with the Regulation 1260/2013, is the 'usually resident population' and means all the persons having their usual residence in a Member State at the reference time. In accordance with this concept, the following persons are considered to be usually residents of the geographical area in question: those who have lived in their place of usual residence for a continuous period of at least 12 months before the reference date or those who arrived in their place of usual residence during the 12 months before the reference date with the intention of staying there for at least one year. Where the circumstances described above cannot be established, 'usual residence' can be taken to mean the place of legal or registered residence.

According to Regulation 1260/2013, live births statistics should refer to the same concept used for population statistics. If population is counted under the usual residence definition, then the live births should be those originating from usually resident mothers. The metadata information sent by the countries confirms that live births statistics are consistent in deffinition with the population from which they originate (see metadata on Population for comparison).

Below is a summary with the reported reference populations based on which statistics on population, births and deaths are transmitted by the national statistical institutes to Eurostat:

1. Usually Resident Population([1]):BE, BG, CZ[4], CY, DE, EE, EL, ES, FI, FR, HR, HU, IE, LT, LV, MT, PL, PT, RO, SI, SK[5], RS, UK.

2. Legal Residence Population ([2]):CH, LI, FI.

3. Registered Residence Population([3]):AT, CZ, DE, DK, ES, IS, IT, LU, NL, NO, SE, TR.

Several countries place themselves in two categories, with justification in the national metadata files found at metadata on Population change - Demographic balance and crude rates at national level.

[1]'Usually Resident Population' as stated in Article 2 of Regulation 1260/2013.

[2]'Legal Residence Population' is composed of those persons who are entitled to be settled in the country at the reference date, either by holding the national citizenship or by other authorization issued by national authorities.

[3]'Registered Residence Population' is composed of those persons who are listed on one or more registers owned by national authorities at the reference date. Each registered person shall be counted only once.

[4]for non-nationals.

[5]permanent residence.

Note: The table above is based on statistics and metadata on population reported by the countries for 1 January 2018.

Breaks in data series could compromise comparability over time. Any breaks in population series due to changes in methodology and data processing or revisions to population counts reported by the countries in question are documented in the Eurostat database using flag b (break in series).

The population data for the year 2021 and after take into account the results of the latest population census (held in 2021-2022). Following Eurostat’s recommendations to ensure consistency of statistics over time, several Member States (Bulgaria, Germany, Ireland, Greece, Spain, Croatia, Italy, Cyprus, Lithuania, Hungary, Malta, Poland, Portugal) have revised or are in process of revising their population time series between the reference years of the population and housing censuses held in 2011 and 2021. While this work is spread over time, revisions are mostly expected in the first quarter of 2024 (for more information about data revision per country, see also 17. Data revision).

Over time, certain countries have been subject to geographical changes (see below):

  • FX stands for Metropolitan France, including Corsica and excluding the overseas departments (DOM).
  • FR stands for France as a whole, including the overseas departments (DOM). Data on Saint Barthelemey are excluded as of 1 January 2012. Data on Mayotte are included, starting with the statistics on vital events for the reference year 2014 and the statistics on population on 1 January 2015.
  • The European geographical aggregates (EU, EA and EEA) include FX up to 1997 and FR from 1998 onwards. This change is indicated by flag b (break in time series) in the EU statistics for 1998.
  • The time series for Germany (DE_TOT) refer to the Federal Republic of Germany after 3 October 1990.
  • As of 1 January 1975, data for Cyprus (CY) refer to the government-controlled area;
  • Up to 1 January 2000, population data for Malta (MT) refer to the Maltese population only. However, as of 2001 figures also include foreign residents. This is indicated by flag b in the figures for 2001.
  • As of 1 January 2010, the statistics on the permanent resident population of Switzerland (CH) include all people in the asylum process who have been residing in Switzerland for 12 months or more. The change is reflected in Eurostat population figures starting with populations reported on 1 January 2011.
  • As of 1 January 2010, Poland (PL) revised the methodology used to estimate the usually resident population. This is indicated by a flag b in the figures for 2010.
  • As of 1 January 2011, Belgium (BE) national population figures refer to all registered people, including asylum seekers.
  • As of 1 January 2012, the reported Estonian (EE) population includes the migration component, whereas this was not included before.
  • Data for Georgia (GE) refer to the government-controlled area.
  • Data for Moldova (MD) refer to the government-controlled area.
  • Data for Ukraine (UA) exclude the illegally annexed Autonomous Republic of Crimea and the City of Sevastopol.