Usual resident population by age and local authority
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All agesMetadata
- Summary information
- Statistical quality information
- Weblinks
- High level information
- Keywords
- Open Data
General description
The Office for National Statistics (ONS) published the first results from Census 2021 for Wales and England on 28 June 2022. These first results included rounded population and household estimates for local authorities in Wales, by sex and five-year age groups. Unrounded population estimates by sex and single year of age were released on 2 November 2022.This StatsWales table is based on Census table TS009 – Unrounded population estimates by sex and single year of age. For Census 2021, the ONS made changes to the data (called statistical disclosure control) so that it is not possible to identify individuals. These changes included:
• Swapped records (targeted record swapping), for example, if a household was likely to be identified in datasets because it has unusual characteristics, they swapped the record with a similar one from a nearby small area. Very unusual households could be swapped with one in a nearby local authority.
• Added small changes to some counts (cell key perturbation), for example, change a count of four to a three or a five. This might make small differences between tables depending on how the data are broken down when perturbation is applied.
This causes small changes to cells but does not fundamentally impact the meaning of the data. Where tables are made in different ways, the changes applied will be different, leading to differences between totals and tables not ‘adding-up’ to their totals. To minimise this, the ONS recommends where possible using totals from tables with fewer cells, at higher geographies. For example, if you wanted population by age you should use data from TS007 and if you wanted population by sex you should use data from TS008.
More information about the processes used in statistical disclosure control will be provided in future publications.
A usual resident of Wales is anyone who was living or staying in Wales for 12 months or
more on Census Day, 21 March 2021, or who had a permanent address in Wales and was staying outside Wales for less than 12 months.
Data collection and calculation
See weblinksFrequency of publication
No longer updatedData reference periods
21 March 2021Users, uses and context
The data presented here are used by central government departments and local authorities for a range of purposes including for resource allocation, planning and monitoring of services, and as denominators for the calculation of various rates and indicators.Rounding applied
To note the sums of local authorities may not add up the Wales figures due to the statistical disclosure methods applied to the data as described in the general description. Figures across different tables may also not match exactly due to statistical disclosure control methods applied to the data.Statistical quality
Further information on the statistical disclosure controls (including perturbation) that have been applied to the data can be found here:https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/methodologies/qualityandmethodologyinformationqmiforcensus2021#methods-used-to-produce-the-data
Weblinks
https://gov.wales/population-and-household-estimates-wales-census-2021https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/methodologies/qualityandmethodologyinformationqmiforcensus2021#methods-used-to-produce-the-data
https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/bulletins/populationandhouseholdestimateswales/census2021
