HES-MHMDS Data Linkage Report, Summary Statistics - 2011-12 (Experimental)
This is the first statistical publication in relation to the linked HES (Hospital Episode Statistics) and MHMDS (Mental Health Minimum Dataset) data. The two data sets have been linked using specific patient identifiers collected in HES and MHMDS. The linkage allows the datasets to be linked in this manner from 2006/07; however this report focuses on patients who were present in the two datasets in 2011/12.
Both HES and MHMDS cover only patients accessing NHS funded services in England and this report has been further restricted to include only those who are aged 18 and over.
The HES-MHMDS linkage provides the ability to undertake national (within England) analysis along acute patient pathways for mental health service users, thereby enabling a much deeper understanding of mental health service users' interactions with acute secondary care.
There are just over 1.6 million individuals who are recorded as being users of adult mental health services (within MHMDS) in 2011/12.
Of these, just over 1.5 million MHMDS service users are aged 18 or over and can be linked to HES . Of this subset:
· it is estimated that around 570,000 (or 37.4 per cent) had at least one inpatient episode of care
· it is estimated that around 1,030,000 (or 67.1 per cent) had at least one outpatient appointment
· it is estimated that around 630,000 (or 41.2 per cent) had at least one A&E attendance
· it is estimated that around 1,200,000 (or 78.4 per cent) accessed at least one hospital service (inpatients episode of care, outpatients appointment or A&E attendance)
 While MHMDS can legitimately contain records for under 18’s its primary focus is adults accessing the services and therefore is not fully representative of the under 18’s age group
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