ESS Standard for Quality Reports Structure (ESQRS)
National Statistical Institute
|Contact organisation unit|
Statistics on Population and Housing fund Department
|Contact person function|
|Contact mail address|
2, P. Volov Str.; 1038 Sofia, Bulgaria
|Contact email address|
|Contact phone number|
+359 2 9857 635
+359 2 9857 463
|Contact fax number|
The dead persons are surveyed. Registration is done at the moment of death and the number is calculated as of 31.12 of the reference year.
Mortality indicators are calculated based on data on deaths. The number of dead children up to one year of age is used for characterizing the infant mortality.
Life tables (biometric tables) and life expectancy are used for examining the age-specific mortality. They indicate the order of dying of a generation and reflect the gradual decrease of this generation due to the mortality. The life tables contain a system of an age-specific coefficients (presented as a function of the age) measuring the level of mortality during the separate time periods, survivors to a given age, life expectancy, etc.
· Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS);
· Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU);
· International Classification of Diseases, X version.
Mortality indicators are calculated for a calendar year. Dead persons are included with an usual residence (current address) in the Republic of Bulgaria.
|Statistical concepts and definitions|
Death means a termination of all vital functions without a possibility to be recovered.
Crude mortality rate
Represents the ratio of the number of deaths during the year to the average annual population in that year expressed per 1000 inhabitants.
Infant mortality rate
Represents the ratio of the number of deaths of children under one year of age during the year to the number of live births in that year expressed per 1000 live births.
Perinatal mortality rate
Perinatal mortality rate represents the ratio of the number of deaths of children under one week and the stillbirths during the year, to 1 000 births in that year (live births and stillbirths).
Neonatal mortality rate
Represents the ratio of the number of deaths of children under 28 days during the year to 1 000 live births in that year.
Late neonatal mortality rate
Represents the ratio of the number of deaths of children from 7th to 27th day during the year to the number of live births in that year.
Post-neonatal mortality rate
Represents the ratio of the number of deaths of children after the 28th day up to 1 year during the year to 1 000 live births, of which the number of deaths of children up to the 28th day is subtracted.
Life expectancy at birth
Represents the ratio between the sum of men-years which the persons who have reached a given age x will survive for the whole period of their future life (from age x to the upper limit age) to the number of persons who have survived the age x.
Probability for dying
Represents the ratio of the number of dead persons at each age and the size of population from which these persons originate.
Probability for surviving
Represents the ratio between the number of those who survive to age x+1 years and the number of those who survive to age x years.
Weekly crude mortality rate (‰) is calculated in promiles as ratio of number of deaths in corresponded week to average annual population multiplied by 365 and divided by 7.
Change of number of deaths in the reporting year compared to average number of deaths for the previous 5 years is calculated as an absolute difference between the number of deaths in а given week of the reporting year and the average number of deaths for the corresponding week of the 5-year period before the reporting year.
Regional breakdown of the population is done according to the country administrative-territorial division as of 31.12 of the reference year - settlements, municipalities, districts and statistical regions.
For dead persons:
· 1888 - 2021 - total for the country and by sex;
· 2010 - 2021 - on the NSI website.
For the life expectancy at birth:
· 1900 - 2021 - total for the country by sex;
· 2010 - 2021 - on the NSI website.
· 2015 – 2022 г. – weekly data available on Information System Infostat of NSI.
Source of data on deaths is the Unified System for Civil registration and Administrative Service of Population. Deaths are registered through a common USCRASP-CDS "Death notification".
|Frequency of data collection|
Exhaustively for all deaths registered during the year.
Computer files are received from the Unified System for Civil registration and Administrative Service of Population (administrative source).
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 is processed by the IS "Demography" according to the rules for validation and control of the demographic events.
Data is validated prior to the release.
Data on deaths and life expectancy is used by different institutions, central and local authorities, as well as by international organisations.
No user' satisfaction surveys are carried out.
Data on deaths is available by sex, age (different groupings), residence (different territorial levels), cause.
|Data completeness - rate|
|Accuracy and reliability|
|Sampling errors - indicators|
|Over-coverage - rate|
|Common units - proportion|
|Non response error|
|Unit non-response - rate|
|Item non-response - rate|
|Imputation - rate|
|Model assumption error|
|Data revision - policy|
|Data revision - practice|
|Data revision - average size|
|Timeliness and punctuality|
Data on deaths are published up to the end of April in the year following the reference year.
Life tables are published up to the end of May in the year following the reference year.
NSI started publishing weekly data on deaths distributed by age, sex and districts on its website on 10th April 2020. Weekly data on dead persons is published on Infostat nine working days after the reference week.
|Time lag - first results|
4 months after the reference year.
|Time lag - final results|
4 monts after the reference year.
Data is released according to the terms.
|Punctuality - delivery and publication|
Data is released and published according to the terms.
|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|
|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|
|Coherence - cross domain|
|Coherence - sub annual and annual statistics|
|Coherence - National Accounts|
|Coherence - internal|
|Accessibility and clarity|
News release "Population and demographic processes".
· Population and demographic processes;
· Statistical Reference book;
· Statistical Yearbook;
· Booklet "Bulgaria".
Data on mortality are available to all users of the NSI website under the heading Population and demographic processes - Mortality: https://www.nsi.bg/en/node/6629
|Data tables - consultations|
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.
Information service on request, according to the Rules for the dissemination of statistical products and services in NSI.
|Metadata - consultations|
|Documentation on methodology|
· Methodology on mortality: https://www.nsi.bg/sites/default/files/files/metadata/Pop_2_Metodology_mortality_en.pdf;
· Methodology on production of life tables;
· Manual for functioning of the Unified System for Civil registration and Administrative Service of Population.
|Metadata completeness – rate|
|Cost and burden|
|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.