Table 1.

Variable names, definitions and data sources

Variable	Definition	Data source
SMI status	Recorded on the QOF Mental Health register with a diagnosis of schizophrenia, bipolar affective disorder and other psychoses	LDN
Gender	Male/female	LDN
Age	Date of extraction - date of birth (years)	LDN
Deprivation	Index of Multiple deprivation 2010 score (quintiles)	LDN ONS
Primary care consultation	Mean annual number of GP face-to-face, telephone and home visits and nurse consultations between October 2010–2013	LDN
Breast cancer screening	Read code indicating breast cancer screen (mammography) & date of last screen	LDN
Cervical cancer screening	Read code indicating cervical cancer screen (smear) & date of last screen	LDN
SMI diagnosis	ICD-10 diagnostic code (primary and secondary diagnosis)	CRIS
Depot injectable	Ever recorded as prescribed depot injectable antipsychotic	CRIS
SMI severity	Any record of a mental health inpatient stay, treatment under the Mental Health Act, difficulty managing their physical health as recorded in a clinical risk assessment; or contact with Assertive Outreach, Crisis team or A&E liaison team	CRIS
SMI risk	Ever recorded with a history of violence, non-compliance, or a forensic history (on the risk assessment violence and aggression subscale)	CRIS

Notes. SMI Serious Mental Illness, QOF Quality and Outcomes Framework, LDN Lambeth DataNet, CRIS Clinical Record Interactive Search; ONS Office for National Statistics, ICD-10 International Statistical Classification of Diseases (2010)