Statistics Portugal

Department of Demographic and Social Statistics

Avenida António José de Almeida

1000-043 Lisboa

Portugal

First results on the main demographic developments in the year of reference.

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Number of persons.

Data are available at national level of geographical detail.

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Counts of statistical units

The reference date for population data is the end of the reference period (midnight of 31st December).
The reference period for vital events data is the calendar year in which the events occurred.  
The reference period for migration flow data is the calendar year in which the migration occurred.

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The data collected are covered by Article 6 (on statistic confidentiality), Law No. 22/2008, (OfficialJournal (OJ) No 92 1st Series, of 13 May 2008).

Statistical Confidentiality.

Population estimates are published at mid-June after the end of the reference year.
Annual data on births, deaths and marriages are published in April of the yearfollowing the data reference year.
First results on immigration and emigration of the preceding year are available at mid-June and complete results at the end-September.

Statistical Information Availability.

Dissemination policy.

Births, deaths and marriages: monthly dissemination.
Population estimates, migration flows: annual dissemination.

Regular press releases on-line, usually on april and mid-June.

Demographic Statistics Yearbook.

Demographic data on population, live births, deaths and migration are available online.

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Data are validated before published in Statistics Portugal online database. No quality assessment report is available.

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National data are consistent with regional data.

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In general terms, revisions are mainly due to new data on the past that could not be incorporated in time of their previous release.

Taking into account the diversity of revision factors and the different frequencies of computation of statistical variables, as well as international experience in this field, revisions can be classified as follows: (1) regular revisions (current or general) and (2) extraordinary revisions.

Minor revisions might occur annually on vital events data.

The annual postcensal resident population estimates are provisional and are reviewed for the intercensal years after the final data of the most recent population census. The series of resident population 2011-2020 based on the 2011 Census was subject to revision, in order to make it compatible with the results of the 2021 Census, in accordance with Statistics Portugal Revisions Policy, in particular the regular general revisions that follow statistical operations of structural nature. The revised annual intercensal series of resident population 2011-2020 based on the results of the 2021 Census was released on March 31st, 2023. At the same date, data on resident population for 2021, the first year of the new post-Census 2021 series, was released. Data on resident population for 2022 refer to the second year of the new series of postcensal estimates based on the 2021 Census. Annual estimates of emigrants and immigrants are reviewed every ten years along with the revision of the resident population estimates.

Resident Population estimates are produced on an annual basis.
Data on births, deaths and marriages: continuous.
Data on migration: annual.

Statistics Portugal carry out the demographic data collection, based on:
— Data on vital events collected by the Civil Registration Offices/Ministry of Justice, according tothe data model designed by Statistics Portugal;
— LFS and Emigration Survey estimates, surveys that are carried out by Statistics Portugal.

Data are subject to a validation process that involves:

a) checks on file structure;

b) checks of the content of file that covers:

• Checking rules: fulfilling of the restriction(s) impose to the data.

• Detecting missing values: when values were not provided.

• Data validation: performed to check if specific logical conditions are fulfilled.

Finally time series checks are performed to detect possible errors that cannot be previously identified as long as the data is internally coherent.

If errors or incoherence of data is detected data provider is contacted for clarifications or corrections.

Based on the national microdata on demographic events transmitted, Statistics Portugal calculates aggregated data on births and deaths. Emigrants and immigrants are estimated based on household survey. Population estimates are obtained by applying component method.

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