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Data Provider: Welsh Government Patients in mental health hospitals and units in Wales with a mental illness
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WalesBetsi Cadwaladr University Health Board267275242231248232224236237224239
Powys Teaching Health Board2351503944454636302930
Hywel Dda University Health Board165156164133132119114123120117123
Abertawe Bro Morgannwg University Health Board511511518495429422440399374373329
Cwm Taf University Health Board227238214196191162139168146142135
Aneurin Bevan University Health Board192207180189191179162169172152154
Cardiff and Vale University Health Board348383396360362327316299289282281



Patients in mental health hospitals and units with a mental illness: Census of patients

Last update

November 2019 November 2019

Next update

October 2020

Publishing organisation

Welsh Government

Source 1

Psychiatric Census, NHS Wales Informatics Service

Contact email



Lowest level of geographical disaggregation

Local health boards

Geographical coverage


Languages covered

English only

Data licensing

You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see

General description

Patients in mental health hospitals and mental health units in hospitals with a mental illness, by age group and health board.

Data collection and calculation

Each year (as of midnight 31st March) a census is taken of residents in NHS hospitals and units for people with a mental illness or a learning disability. Local Health Boards provide data to the NHS Wales Informatics Service (NWIS).

The data covers patients in mental health hospitals and mental health units in hospitals that may have other specialties.

The census does not include Welsh residents who are patients at hospitals in England.

Frequency of publication


Data reference periods

Data is shown for each year from 2009 onwards.
The census is taken at 31 March each year.

Users, uses and context

Please find this information in the related statistical publication, as per the given weblink

Rounding applied


Revisions information

Data are not routinely revised. However, any revisions will be marked with an 'r'.

Statistical quality

Please find this information in the “Key Quality Information” section of related statistical publication: "Patients in mental health hospitals and units in Wales"


mental health, mental illness, learning disability