Table 1.

Brief description of data sources.

Data Collection	Data Coverage
Midwives Notifications System (MNS)	Notifications for all births attended by a midwife where the gestational age is at least 20 weeks or infant weight 400 g+ if gestation unknown
Birth Registrations	All births registered in Western Australia
Department of Corrective Services	All records of adult and juvenile offenders detained in Western Australian prisons, and under departmental supervision on community-based orders
Hospital Morbidity Data Collection (HMDC)	All inpatient records for Western Australian public and private acute and psychiatric hospitals
Mental Health Information System (MHIS)	All presentations to public community mental health services
Department of Communities: Child Protection and Family Support	All reports of concern for child welfare, investigations, protection applications and orders, and placements in out-of-home care