Table 1.
Definitions and data sources of the outcome and explanatory variables used
| Variable Used | Data Source | Date Extracted | Definition |
|---|---|---|---|
| Outcome Variable | |||
| Detentions under the Mental Health Act 1983 | NHS Digital Mental Health Services Data Set | 2021/22 | People subject to detention under the Mental Health Act expressed as a rate of the base population of each CCG. Available for all ages. |
| Main Analysis | |||
| Severe Mental Illness | NHS Digital Quality and Outcomes Framework | 2020/21 | The number of patients on GP registers recorded as having schizophrenia, bipolar affective disorder, or other psychoses as a percentage of all people on GP registers. Available for all ages. |
| Depression | NHS Digital Quality and Outcomes Framework | 2020/21 | The number of patients on GP registers aged 18 + with a new diagnosis of depression recorded between April 1st 2020 – March 31st 2021 as a percentage of all people on GP registers. |
| Deprivation | PHE’s Fingertips Database (Indicator 93275) | 2019 | The Index of Multiple Deprivation Score of each CCG - an overall measure of multiple deprivation experienced by people living in an area. Available for all ages. |
| Non-White Ethnicity | PHE’s Fingertips Database (Indicator 93267) | 2011 | Percentage of population reporting to be Non-White UK (includes Gypsy, Roma, and Traveller and Northern Irish people). Available for all ages. Data from the 2011 Office for National Statistics Census. |
| Age | Office for National Statistics | 2020 (Mid-2020 Population Estimates) | Percentage of the population who were aged 18 to 35. Data extrapolated from the 2011 Office for National Statistics Census. |
| Sex | Office for National Statistics | 2020 (Mid-2020 Population Estimates) | Percentage of the population who record their sex as “male”. Available for all ages. Data extrapolated from the 2011 Office for National Statistics Census. |
| Community and outpatient mental health service visits | PHE’s Fingertips Database (Indicator 93622) | 2019/20 | Directly standardised rate of attended non-inpatient contacts with secondary mental health services, per 100,000 population. Available for all ages. |
| Urbanicity | Office for National Statistics | 2021 | 2011 Rural-Urban Classifications- “Predominantly Urban”, “Urban with Significant Rural”, and “Predominantly Rural”. |
Note NHS: National Health Service; CCG: Clinical Commissioning Group; PHE: Public Health England; GP: General Practitioner