Technical notes
Data sources
Hospitalisations data on injury cases are sourced from the Australian Institute of Health and Welfare’s (AIHW) National Hospital Morbidity Database (NHMD). The NHMD is a compilation of episode-level records from admitted patient morbidity data collection systems (APC NMDS) in Australian public and private hospitals. It includes episodes of care for admitted patients in all public and private acute and psychiatric hospitals, free standing day hospital facilities and alcohol and drug treatment centres in Australia. Hospitals operated by the Australian Defence Force, corrections authorities and in Australia's offshore territories may also be included. Hospitals specialising in dental, ophthalmic aids and other specialised acute medical or surgical care are included. Data quality statements for the NHMD are available on the AIHW MyHospitals website. For more information about data contained in the NHMD refer to the AIHW MyHospitals technical notes.
Emergency department (ED) data are sourced from the National Non-admitted Patient Emergency Department Care Database (NNAPEDCD). Data quality statements for this dataset are available on the AIHW MyHospitals website. For the 2021–22 NNAPEDC NMDS/NBEDS, diagnosis information was reported using the ED ICD-10-AM version 11 shortlist that can be found on the website of the Independent Hospital Pricing Authority.
For more information about data contained in the NNAPEDCD refer to the MyHospitals technical notes for recent years.
Population data are used for demographic analyses and as the denominator in calculating rates. All population level calculations are based on the estimated resident population (ERP) calculated as at the midpoint of each financial year. For example, for the reporting period 2021–22, the denominator population is the June 2021 ERP + the June 2022 ERP, divided by 2. This is used as the denominator for age specific/crude and age standardised rates.
The ERP as at 30 June 2001 is used as the standardising population throughout the report (ABS 2003).
All population data are sourced from the Australian Bureau of Statistics (ABS) as follows:
- General populations are from National, state and territory population
- Remoteness populations (available on request from ABS)
- Indigenous populations are from Estimates and Projections, Aboriginal and Torres Strait Islander Australians (ABS 2019).
AusPlay data is collected by Engine on behalf of Sport Australia. Australian residents are randomly selected using their mobile phone number and interviewed via a computer assisted telephone interview (CATI). The target sample size is 20,000 people aged 15 years and over, who are asked about their own participation, as well as any child under the age of 15 that they are the parent/guardian of. Due to differences in collection methods, data from the child cohort (0–14) should not be compared against Australians aged 15 and over. The survey period for the 2021–22 data is 1 July 2021 to 30 June 2022.
The sample data is projected to population estimates using a common post-stratified weighting (scaling) method. As the survey estimates are based on a sample, rather than the full population, they will have sample error. One measure of the sample error is the relative margin of error (RMOE). Survey estimates with a RMOE between 50% and 100% should be used with caution. Survey estimates with a RMOE greater than 100% are considered too unreliable to use.
AusPlay survey respondents answer questions about their participation in sports and physical recreation in the 12 months prior to interview. A respondent needs only to have participated once in the previous 12 months to be counted as a participant. The survey does not distinguish between organised sports and recreational participation. Thus, for example, a participant in soccer may have played consistently in an organised competition over a 6 month period, or may have played soccer recreationally at a park with friends: both are treated equally as soccer participants.
For full information on the AusPlay to ICD-10-AM code mapping used for this report, see the Sports Injury in Australia technical notes.