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Table 1 Example of a data linkage system: core datasets of the WA data linkage system

From: The quality of Indigenous identification in administrative health data in Australia: insights from studies using data linkage

Dataset Information Collected (All include some demographic information) Years of Data Who Collects Indigenous identity information
Hospital Morbidity Data Set (HMDS) Patient separations from hospital – reasons for admission, illnesses, details of discharge etc. 1970 - Hospital administrative staff (Admission clerks, ward clerks)
Mortality Data Registrar General records information on all deaths in WA including date and cause of death 1969 - Funeral directors, may be modified by ABS (see Figure2)
Mental Health Database System (MHDS) Patient separations from mental health facilities - reasons for admission, illnesses etc. 1966 - Hospital administrative staff (Admission clerks, ward clerks)
WA Cancer Registry Notification of incident cancers 1981 - Diagnosing doctors and laboratories
Midwives Data Collection Information on all births in WA, only the mother’s Indigenous identity is recorded in relation to the newborn 1980 - Midwives
Birth Registry Data Registrar General collects information on all births in WA including data and place of birth. 1974 - Both parents are required to complete and sign the Birth Registration form
Electoral Roll Every eligible Australian citizen (18 years or older) is required by law to enrol and vote   Not applicable (i.e. no information on Indigenous status is collected)