The table below shows finished admission episodes (FAEs) with a primary or secondary diagnosis of cannabis-induced psychosis, for patients aged 0-17 in the period 2009/10 to 2013/14. This is not a count of people as one person may have had more than one admission episode within the same time period. The clinical codes used for collecting data do not distinguish between different forms of cannabis or between different cannabinoids. Nor does the information identify the type of unit where the patient was treated. Information on the cost of providing healthcare to people misusing or dependent on cannabis is not available.
Count of FAEs1 with a primary or secondary diagnosis2 of cannabis-induced psychosis3, for patients aged 0-17, 2009-10 to 2013-144
Activity in English NHS Hospitals and English NHS commissioned activity in the independent sector
1 Finished admission episodes
A finished admission episode (FAE) is the first period of admitted patient care under one consultant within one healthcare provider. FAEs are counted against the year or month in which the admission episode finishes. Admissions do not represent the number of patients, as a person may have more than one admission within the period.
2 Number of episodes in which the patient had a primary or secondary diagnosis
The number of episodes where this diagnosis was recorded in any of the 20 (14 from 2002-03 to 2006-07 and 7 prior to 2002-03) primary and secondary diagnosis fields in a Hospital Episode Statistics (HES) record. Each episode is only counted once, even if the diagnosis is recorded in more than one diagnosis field of the record.
3 Clinical Coding
Clinical codes used to identify cannabis-induced psychosis:
F12.5 Mental and behavioural disorders due to use of cannabinoids Psychotic disorder
Includes but is not limited to cannabis induced psychosis
F12.7 Mental and behavioural disorders due to use of cannabinoids, Residual and late-onset psychotic disorder
Includes but is not limited to cannabis induced late onset psychosis
4 Assessing growth through time (Admitted patient care)
HES figures are available from 1989-90 onwards. Changes to the figures over time need to be interpreted in the context of improvements in data quality and coverage (particularly in earlier years), improvements in coverage of independent sector activity (particularly from 2006-07) and changes in NHS practice. For example, apparent reductions in activity may be due to a number of procedures which may now be undertaken in outpatient settings and so no longer include in admitted patient HES data. Conversely, apparent increases in activity may be due to improved recording of diagnosis or procedure information.
Note that HES include activity ending in the year in question and run from April to March, e.g. 2012-13 includes activity ending between 1 April 2012 and 31 March 2013.