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DDI2.5 XML CODEBOOK RECORD FOR STUDY NUMBER 9156 2021 Census: Safeguarded Household Microdata Sample (England and Wales) 915610.5255/UKDA-SN-9156-1 Office for National Statistics <a href="https://www.nationalarchives.gov.uk/information-management/re-using-public-sector-information/uk-government-licensing-framework/crown-copyright/" target="_blank">© Crown copyright</a>. The use of these data is subject to the <a href="https://ukdataservice.ac.uk/app/uploads/cd137-enduserlicence.pdf" target="_blank">UK Data Service End User Licence Agreement</a>. Additional restrictions may also apply. Office for National Statistics UK Data Service 18 October 2023 SEXEDUCATIONAL BACKGROUNDMOTOR VEHICLESINFORMAL CAREHEALTHECONOMIC ACTIVITYMARITAL STATUSROOMSPLACE OF BIRTHINTERNAL MIGRATIONNATIONAL IDENTITYOCCUPATIONSBEDROOMSHOUSING TENUREETHNIC GROUPSINTERNATIONAL MIGRATIONAGECOMMUTINGLANGUAGES USED AT HOMESTUDENTSHOUSEHOLDSRELIGIOUS AFFILIATIONDISABILITIESCENSUS DATA CensusesSocial stratification and groupingsSociety and culture Abstract copyright UK Data Service and data collection copyright owner.The 2021 UK Census was the 23rd official census of the United Kingdom. The UK Census is generally conducted once every 10 years, and the 2021 censuses of England, Wales, and Northern Ireland took place on 21 March 2021. In Scotland, the decision was made to move the census to March 2022 because of the impact of the coronavirus pandemic (see SNs 9461 and 9462). The censuses were administered by the <a title="Office for National Statistics" href="https://www.ons.gov.uk/census" style="background-color: rgb(255, 255, 255);">Office for National Statistics</a> (ONS), the <a title="Northern Ireland Statistics and Research Agency" href="https://www.nisra.gov.uk/statistics/census/2021-census" style="background-color: rgb(255, 255, 255);">Northern Ireland Statistics and Research Agency</a> (NISRA) and <a title="National Records of Scotland" href="https://www.scotlandscensus.gov.uk/about/scotlands-census-2022-general-report/" target="_blank" style="background-color: rgb(255, 255, 255);">National Records of Scotland</a> (NRS), respectively. Census 2021 was the first census with a digital-first design, encouraging participants to respond online rather than on a paper questionnaire. Support was given to people who could not respond online, including paper questionnaires, telephone contact centres, field force support, and an extended collection period.Topics covered in the 2021 UK Census included:<ul><li>demography and migration</li><li>ethnic group, national identity, language and religion</li><li>labour market and travel to work</li><li>housing</li><li>education</li><li>health, disability, and unpaid care</li><li>Welsh and other languages</li><li>UK armed forces veterans</li><li>sexual orientation and gender identity.</li></ul>The 2021 Census: Safeguarded Household Microdata Sample dataset consists of a random sample of 1% of households from the 2021 Census and contains records for all individuals within these sampled households. It includes records for 263,729 households and 606,210 persons. These data cover England and Wales only. This sample allows linkage between individuals in the same household.  The lowest level of geography is Wales and regions within England. It contains 56 variables and a low level of detail. This is a new ONS product following user feedback from the 2011 Census.Census MicrodataMicrodata are small samples of individual records from a single census from which identifying information have been removed. They contain a range of individual and household characteristics and can be used to carry out analysis not possible from standard census outputs, such as:<ul><li>creating tables using bespoke variable combinations</li><li>investigating specific combinations of variables or categories in a high level of detail</li><li>conducting non-tabular statistical analyses on record-level data.</li></ul>The microdata samples are designed to protect the confidentiality of individuals and households. This is done by applying access controls and removing information that might directly identify a person, such as names, addresses and date of birth. Record swapping is applied to the census data used to create the microdata samples. This is a statistical disclosure control (SDC) method, which makes very small changes to the data to prevent the identification of individuals. The microdata samples use further SDC methods, such as collapsing variables and restricting detail. The samples also include records that have been edited to prevent inconsistent data and contain imputed persons, households, and data values. To protect confidentiality, imputation flags are not included in any 2021 Census microdata sample.Main Topics: The 2021 Census: Safeguarded Household Microdata Sample data cover: demography, education, ethnicity, identity, language, religion, health, disability, unpaid care, housing, internal migration, international migration, labour market, students, and travel to work. England and Wales IndividualsFamilies/householdsNational The safeguarded household microdata sample consists of a random sample of 1% of households and contains records for all individuals within these sampled households. By design, all of the safeguarded samples include a different set of people. The sample contains 263,729 households, 606,210 persons. For households containing no enumerated persons, records in the sample will only include household-level data. The Census 2021 microdata samples include data from the total England and Wales population, which includes: 'usual' residents, non-UK born short-term residents staying 3 to 12 months, and students living at an alternative address during term-time Numeric Repeated cross-sectional study Multi-stage stratified random sample Self-administered questionnaireCompilation/SynthesisWeb-based interview The Data Collection is available to UK Data Service registered users subject to the <a href="https://ukdataservice.ac.uk/app/uploads/cd137-enduserlicence.pdf" target="_blank">End User Licence Agreement</a>.Data storage and access are limited to the UK and countries that the UK deemed to have an adequate level of data protection as follows: European Economic Area countries, Andorra, Argentina, Faroe Islands, Gibraltar, Guernsey, Israel, Isle of Man, Jersey, New Zealand, Republic of Korea, Switzerland and Uruguay.Access requests from users not in the above categories and commercial use of data require approval from the data depositor or their nominee. Commitments have been made to those who have provided data in response to the Census, in order to ensure those commitments are kept we may not be able to provide access to safeguarded Census data from some locations. See <restrctn> https://www.ons.gov.uk/census https://www.nisra.gov.uk/statistics/census/2021-census https://www.scotlandscensus.gov.uk/about/scotlands-census-2022-general-report/ https://www.scotlandscensus.gov.uk/ https://www.ons.gov.uk/census/aboutcensus/censusproducts/microdatasamples https://oai.ukdataservice.ac.uk:8443/oai/provider 9156 2025-11-06T05:54:30Z ddi:codebook:2_5