Fertility




Euro-SDMX Metadata Structure (ESMS)

FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate
Contact
Contact organisation

National Statistical Institute

Contact organisation unit

Population and Housing Fund Statistics Department

Contact name

Nadejda Karlezhova

Contact person function

Chief expert

Contact mail address

2, P. Volov Str.; 1038 Sofia, Bulgaria

Contact email address

[email protected]

Contact phone number

+359 2 9857 543

Contact fax number
Metadata update
Metadata last certified14 June 2019
Metadata last posted14 June 2019
Metadata last update14 June 2019
Statistical presentation
Data description

The births and the children born are surveyed. Registration is done at the moment of occurrence and the number is calculated as of 31.12 of the reference year. Live births and stillbirths are covered.

Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS document "Birth notification".

Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions) based on the current address.

Live births are used for calculation of indicators, characterizing the fertility.

Classification system

· Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS);

· Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU).

Sector coverage

All children born with a usual residence (current address) in the Republic of Bulgaria are included.

Statistical concepts and definitions

"Birth” is a complete expulsion or extraction from the mother of a foetus, irrespective alive or dead, that meet the following criteria: not

a) body weight at birth of 800 grams and over and / or 26 weeks of gestation;

b) body weight at birth of less than 800 grams and / or less than 26 weeks of gestation - provided that the foetus was born alive and has lived at least 3 days.

"Alive" is a foetus who shows signs of blood circulation. In absence of such signs, the foetus is considered “dead” (foetus mortuus).

“Abortion” is a loss or interruption of a pregnancy before the foetus to meet the above mentioned criteria. 

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

The total fertility rate is the sum of the age-specific fertility rates for the reference year. It represents 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.

The net reproduction rate is the ratio between the number of women who have gave a birth during the year and the daughters born during the same year taking into account the mortality. It represents the average number of daughters that will survive until childbearing ages, born to a woman if they will experience the age-specific fertility and mortality rates of the year in question, i.e. how many girls replace a mother under the reproduction conditions during the respective year.

The age of parents at birth is calculated in completed years based on the date of birth of parents and the date of event birth.

The mean age of the mother at childbearing is calculated as a weighted average within the interval between the birth of mothers generations and children birth.

Statistical unit

Children born - live born and stillborn.

Statistical population

Total number of births.

Reference area

Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions).

Time coverage

1888  - 2018 total number and by sex;

2010 - 2018 on the NSI website.

Base period

Not applicable.

Unit of measure

Number; per 1 000 population.

Reference period

Calendar year

Institutional mandate
Legal acts and other agreements

· Law on Statistics;

· Law on Civil Registration;

· Ordinance of the Ministry of Health.

· Regulation (EU) 1260/2013 of the European Parliament and of the Council on the European demographic statistics;

· Commission implementing regulation (EU) № 205/2014 laying down uniformed conditions for the implementation of Regulation (EU) No 1260/2013 of the European Parliament and the Council on European demographic statistics, as regards breakdowns of data, deadlines and data revisions;

Data sharing

Data are transmitted to Eurostat, UNICEF, UN ECE, World bank and other institutions on the basis of Regulation (EU) 1260/2013 of the European Parliament and of the Council on the European demographic statistics.

Confidentiality
Confidentiality - policy

· Law on Statistics;

· Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.

Confidentiality - data treatment

Individual data are not published in accordance with article 25 of the Law on Statistics. The publishing of individual data can be performed only in accordance with article 26 of the same law.

Release policy
Release calendar

Information is published annually according to the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute.

Release calendar access

The calendar is available on the NSI website: http://www.nsi.bg/en/node/480

User access

Data is published on the NSI website, section Population - Demography, migration and projections in accordance with the Law on Statistics and the European Statistics Code of Practice respecting the professional independence and aimed at objectivity, transparency and equal treatment of all consumers.

Frequency of dissemination

Annually

Accessibility and clarity
News release

News release "Population and demographic processes".

Publications

· Population and demographic processes;

· Statistical Reference book;

· Statistical Yearbook;

· Booklet "Bulgaria".

On-line database

Data on Fertility are available to all users of the NSI website under the heading Population - Demography, Migration and Projections - Fertility: http://www.nsi.bg/en/node/6610

Information System Infostat: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=52

Micro-data access

Anonymised individual data can be provide for scientific and research purposes, and for individual request according to the Rules for the provision of anonymised individual data for scientific and research purposes.

Other

Information service on request, according to the Rules for the dissemination of statistical products and services in NSI.

Documentation on methodology

· Methodology on fertility: http://www.nsi.bg/sites/default/files/files/metadata/Pop_1_Metodology_births_en.pdf;

· Manual for functioning of the Unified System for Civil registration and Administrative Service of Population.

Quality documentation

Not available.

Quality management
Quality assurance

Not applicable.

Quality assessment

Not applicable.

Relevance
User needs

Data on fertility are presented annually to the Eurostat, UN, UNICEF, ECE, WHO and others ? questionnaires filled in annually.

At national and regional level the main data users are ministries, agencies, national organisations and local authorities.

Data is presented to scientific institutes, universities, NGOs and others based on requests.

User satisfaction

No user' satisfaction surveys are carried out.

Completeness

Data on fertility is available by sex, weight, height, consecutive number and residence of the child (different territorial levels), place and assistance at birth, multi-foetal births, age (different groupings) of the parents, year of birth of the parents, consecutive number of the mother marriage, pregnancy, citizenship and country of birth of the mother, citizenship of the father.

Accuracy and reliability
Overall accuracy

Not applicable.

Sampling error

Not applicable.

Non-sampling error

Not applicable.

Timeliness and punctuality
Timeliness

Data is published up to the end of April of the year following the reference year.

Punctuality

Data is released according to the terms provided in the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute..

Coherence and comparability

Comparability - geographical

Data is collected and processed for the different territorial units using one and the same methodology and definitions.

Comparability - over time

Changes of the methodology and definitions for different time periods are published in the survey methodology and metadata.

Coherence - cross domain

Not applicable.

Coherence - internal

Not applicable.

Cost and burden

Not applicable.

Data revision
Data revision - policy

Not applicable.

Data revision - practice

Not applicable.

Statistical processing
Source data

Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS ?Birth notification?.

Frequency of data collection

Monthly

Data collection

Exhaustively for all births registered during the year.

Computer files are received from the Unified System for Civil registration and Administrative Service of Population (administrative source).

Data validation

Data on demographic events is checked and controlled before to be loaded in the IS "Demography".

For successful processing, the initial notification should meet the system rules on validation and control.

The processed results are validated in respect the consistency of a single table and between the tables.

Data compilation

Data is processed by the IS "Demography" according to the rules for validation and control of the demographic events.

Adjustment

Not applicable.

Comment
Metadata Structure Definition in SDMX 2.1: ESMS_MSD+BNSI+2.0+SDMX.2.1.xml
Metadata Structure Definition in SDMX 2.0: ESMS_MSD+BNSI+2.0+SDMX.2.0.xml


ESS Standard for Quality Reports Structure (ESQRS)

FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate
Contact
Contact organisation

National Statistical Institute

Contact organisation unit

Population and Housing Fund Statistics Department

Contact name

Nadejda Karlezhova

Contact person function

Chief expert

Contact mail address

2, P. Volov Str.; 1038 Sofia, Bulgaria

Contact email address

[email protected]

Contact phone number

+359 2 9857 543

Contact fax number
Statistical presentation
Data description

The births and the children born are surveyed. Registration is done at the moment of occurrence and the number is calculated as of 31.12 of the reference year. Live births and stillbirths are covered.

Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS document "Birth notification".

Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions) based on the current address.

Live births are used for calculation of indicators, characterizing the fertility.

Classification system

· Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS);

· Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU).

Sector coverage

All children born with a usual residence (current address) in the Republic of Bulgaria are included.

Statistical concepts and definitions

"Birth” is a complete expulsion or extraction from the mother of a foetus, irrespective alive or dead, that meet the following criteria: not

a) body weight at birth of 800 grams and over and / or 26 weeks of gestation;

b) body weight at birth of less than 800 grams and / or less than 26 weeks of gestation - provided that the foetus was born alive and has lived at least 3 days.

"Alive" is a foetus who shows signs of blood circulation. In absence of such signs, the foetus is considered “dead” (foetus mortuus).

“Abortion” is a loss or interruption of a pregnancy before the foetus to meet the above mentioned criteria. 

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

The total fertility rate is the sum of the age-specific fertility rates for the reference year. It represents 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.

The net reproduction rate is the ratio between the number of women who have gave a birth during the year and the daughters born during the same year taking into account the mortality. It represents the average number of daughters that will survive until childbearing ages, born to a woman if they will experience the age-specific fertility and mortality rates of the year in question, i.e. how many girls replace a mother under the reproduction conditions during the respective year.

The age of parents at birth is calculated in completed years based on the date of birth of parents and the date of event birth.

The mean age of the mother at childbearing is calculated as a weighted average within the interval between the birth of mothers generations and children birth.

Statistical unit

Children born - live born and stillborn.

Statistical population

Total number of births.

Reference area

Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions).

Time coverage

1888  - 2018 total number and by sex;

2010 - 2018 on the NSI website.

Base period

Not applicable.

Statistical processing
Source data

Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS ?Birth notification?.

Frequency of data collection

Monthly

Data collection

Exhaustively for all births registered during the year.

Computer files are received from the Unified System for Civil registration and Administrative Service of Population (administrative source).

Data validation

Data on demographic events is checked and controlled before to be loaded in the IS "Demography".

For successful processing, the initial notification should meet the system rules on validation and control.

The processed results are validated in respect the consistency of a single table and between the tables.

Data compilation

Data is processed by the IS "Demography" according to the rules for validation and control of the demographic events.

Adjustment

Not applicable.

Quality management
Quality assurance

Not applicable.

Quality assessment

Not applicable.

Relevance
User needs

Data on fertility are presented annually to the Eurostat, UN, UNICEF, ECE, WHO and others ? questionnaires filled in annually.

At national and regional level the main data users are ministries, agencies, national organisations and local authorities.

Data is presented to scientific institutes, universities, NGOs and others based on requests.

User satisfaction

No user' satisfaction surveys are carried out.

Completeness

Data on fertility is available by sex, weight, height, consecutive number and residence of the child (different territorial levels), place and assistance at birth, multi-foetal births, age (different groupings) of the parents, year of birth of the parents, consecutive number of the mother marriage, pregnancy, citizenship and country of birth of the mother, citizenship of the father.

Data completeness - rate

100%

Accuracy and reliability
Overall accuracy

Not applicable.

Sampling error

Not applicable.

Sampling errors - indicators

Not applicable.

 

Non-sampling error

Not applicable.

Coverage error

Not applicable.

 

Over-coverage - rate

Not applicable

Common units - proportion

Not applicable

Measurement error

Not applicable

Non response error

Not applicable

Unit non-response - rate

Not applicable

Item non-response - rate

Not applicable

Processing error

Not applicable

Imputation - rate

Not applicable

Model assumption error

Not applicable

Seasonal adjustment

Not applicable

Data revision - policy

Not applicable.

Data revision - practice

Not applicable.

Data revision - average size
Timeliness and punctuality
Timeliness

Data is published up to the end of April of the year following the reference year.

Time lag - first results

4 months after the reference year

Time lag - final results

4 months after the reference year

Punctuality

Data is released according to the terms provided in the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute..

Punctuality - delivery and publication

Nor applicable

Coherence and comparability

Comparability - geographical

Data is collected and processed for the different territorial units using one and the same methodology and definitions.

Asymmetry for mirror flows statistics - coefficient

Not applicable

Comparability - over time

Changes of the methodology and definitions for different time periods are published in the survey methodology and metadata.

Length of comparable time series

2000 onwards

Coherence - cross domain

Not applicable.

Coherence - sub annual and annual statistics

Not applicable

Coherence - National Accounts

Not applicable

Coherence - internal

Not applicable.

Accessibility and clarity
News release

News release "Population and demographic processes".

Publications

· Population and demographic processes;

· Statistical Reference book;

· Statistical Yearbook;

· Booklet "Bulgaria".

On-line database

Data on Fertility are available to all users of the NSI website under the heading Population - Demography, Migration and Projections - Fertility: http://www.nsi.bg/en/node/6610

Information System Infostat: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=52

Data tables - consultations

not applicable

Micro-data access

Anonymised individual data can be provide for scientific and research purposes, and for individual request according to the Rules for the provision of anonymised individual data for scientific and research purposes.

Other

Information service on request, according to the Rules for the dissemination of statistical products and services in NSI.

Metadata - consultations

not applicable

Documentation on methodology

· Methodology on fertility: http://www.nsi.bg/sites/default/files/files/metadata/Pop_1_Metodology_births_en.pdf;

· Manual for functioning of the Unified System for Civil registration and Administrative Service of Population.

Metadata completeness – rate

100%

Quality documentation

Not available.

Cost and burden

Not applicable.

Confidentiality
Confidentiality - policy

· Law on Statistics;

· Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.

Confidentiality – data treatment

Individual data are not published in accordance with article 25 of the Law on Statistics. The publishing of individual data can be performed only in accordance with article 26 of the same law.

Comment
Metadata Structure Definition in SDMX 2.1: ESQRS_MSD+BNSI+2.0+SDMX.2.1.xml
Metadata Structure Definition in SDMX 2.0: ESQRS_MSD+BNSI+2.0+SDMX.2.0.xml
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