Data caveats

The Department of Health and Human Services (DHHS) collects morbidity data on all admitted patients from all Victorian public and private acute hospitals including rehabilitation centres, extended care facilities and day procedure centres. These data form the Victorian Admitted Episodes Dataset (VAED). Further detailed information about the VAED can be found at: http://www.health.vic.gov.au/hdss/vaed/index.htm.

The Injury Atlas is aggregated data based on injury data from the VAED, supplied to the Victorian Injury Surveillance Unit by DHHS. It does not include any unit record data Further detailed information about the VAED can be found at: http://www.health.vic.gov.au/hdss/vaed/index.htm.

VAED caveats:

Data are currently coded to the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification (ICD-10-AM).

The VAED dataset held at VISU contains only cases where an injury or an external cause of injury is coded for the patient. The external causes chapters of ICD-10-AM describe the causes of injury, poisoning and adverse events (complications of medical and surgical care). The Injury Atlas tables and maps are limited to cases with unintentional injury (external cause code in the range “V00-X59”), and community injury (occurring in settings such as car crashes, sporting and recreational activities and work, i.e., ICD-10-AM codes “S00-T75” and “T79”) in the VAED as the principle diagnosis, and exclude complications of medical and surgical care.

Each record in the dataset represents an episode of care, and not necessarily one incident. A patient may be transferred between and within hospitals for various episodes of care relating to injuries arising from one or more incidents and may therefore be represented by more than one record in the VAED. Admissions as a result of transfer from another hospital or due to a statistical separation from the same hospital are excluded in the Injury Atlas.

Multiple admissions for day-treatments (admitted and separated on the same day) can be recorded for certain patients for the same condition(s): e.g., hyperbaric chamber treatment. When such cases can be clearly identified the relevant readmission records are also excluded from the Injury Atlas.

Sports injury cases are those with an ICD-10-AM activity code of “U50-U71”.

In July 2012 the Victorian Hospital Admission Policy changed significantly so that episodes of care delivered entirely within a designated emergency department or urgent care centre could no longer be categorised as an admission regardless of the amount of time spent in the hospital. Previously, these types of episodes could be categorised as an admission if the length of time in the hospital was four hours or more. This has reduced the number of admissions recorded on the VAED from 2012/13 onwards.