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Table 1 Summary of key variables and data definitions used in the record linkage process

From: Patient-specific record linkage between emergency department and hospital admission data for a cohort of people who inject drugs: methodological considerations for frequent presenters

Application Datasources
Victorian Emergency Minimum Dataset (VEMD)a Victorian Admitted Episode Dataset (VAED)a
For linkage to cohort data Medicare number
Medicare suffix
Date of birth
Medicare number
Medicare suffix
Date of birth
For VEMD to VAED linkage Unique identifierb
Arrival date
Arrival time
Departure date
Departure time
Unique identifierb
Admission date
Admission time
Separation date
Separation time
Useful for manual inspection of links Type of visit
Referred by
Departure status
Reason for transfer
Campus code
ICD-10-AM diagnosesc
Admission type
Admission source
Separation mode
Accommodation type on separation
Campus code
ICD-10-AM diagnosisc
Care type
Clinical speciality
For identifying continuous episodes of care Departure status indicating planned transfer of care
Transfer to mental health bed, different hospital
Transfer to another hospital campus
Transfer to intensive care, different hospital
Separation mode indicating transfer of care
Statistical separationd
Separation and transfer to other hospital
Cross checking expected versus found links Departure status suggesting admission occurred
Ward setting at this hospitale
Procedure room at this campus
Transfers to another hospital campus
Departure status suggesting no admission
Return to usual residencef
Left before treatment completedg
Dead on arrival or died in ED
Admission type suggesting preceding ED visit
Emergency admission through this hospital
Admission type cannot confirm prior ED visit
Admission from waiting list
Other admissionh
Statistical admissiond
Other emergency admissionj
  1. aData definitions for VEMD and VAED between 2008 and 2013 were reviewed and amalgamated for this study
  2. bWhere a unique identifier is assigned by the Centre for Victorian Data Linkage
  3. cInternational Classification of Diseases, 10th revision, Australian Modification
  4. dRefers to change in care type within the same hospital
  5. eIncludes intensive care, mental health beds, other wards, coronary care, mental health observation units, short stay units, emergency medical units and medical assessment and planning units
  6. fWhere usual residence includes home, correctional/custodial facility, mental health residential facility, residential care home
  7. gIncludes left at risk after treatment started, left after clinical advice, left at own risk without treatment
  8. hIncludes planned admissions from outpatient departments, day-surgeries or day treatments (e.g. chemotherapy or dialysis), and follow up admissions following a previous emergency department presentation
  9. iPertains to the admission of a pregnant female of 20 or more weeks’ gestation, or a female within 42 days of giving birth
  10. jIncludes patients referred from general practice or outpatient clinics for direct ward admission as well as patients that have presented to non-VEMD reporting emergency departments