Each year (as of midnight 31st March) a census is taken of residents in NHS hospitals and units for people with a mental health condition or a learning disability.
The psychiatric census is a census of all psychiatric patients i.e. all patients, not yet discharged from a hospital provider spell on 31st March, who have been under the care of consultants in Learning Disability (speciality 700) or in mental health specialities (710-715) for the majority of the hospital provider spell to the date of the census. Includes patients who meet these criteria but at the time of the census are under the care of a non-psychiatric consultant.
Further information on the Psychiatric Census can be found via the Stats Wales website at:
https://statswales.gov.wales/Catalogue/Health-and-Social-Care/Mental-Health/Psychiatric-Census