National Disability Agreement: c(1)-Proportion of the potential population accessing disability services, 2011 QS
Identifying and definitional attributes
|Metadata item type:||Quality Statement|
|Indicators linked to this Quality statement:|
|Quality statement summary:|
1. CSTDA NMDS data are generated by processes that deliver services to people. It is assumed that these processes involve the assessment of disability support needs following broadly consistent principles and practices across jurisdictions. However, this assumption is untested.
2. Data measuring the potential population is not explicitly available for the required time point and so has been estimated from several difference sources under several key assumptions. The assumption of constant age-sex specific rates of severe/profound core activity limitation over time is not contradicted by historical SDAC data up to 2003. Data are not available to test whether rates have been stable since 2003 but no research has shown a change to the relative stability of age-sex specific disability prevalence. A further assumption that national level age-sex specific rates of severe/profound core activity limitation from the 2003 SDAC apply consistently across states/territories is untested.
3. There are issues with the consistency of the numerator and denominator for this performance indicator, as the numerator and denominator are drawn from differently defined populations and different data sources.
The AIHW is an Australian Government statutory authority accountable to Parliament and operates under the provisions of the Australian Institute of Health and Welfare Act 1987. The AIHW provides expert analysis of data on health, housing and community services. More information about the AIHW is available on the AIHW website.
|Timeliness:||CSTDA NMDS 2007–08 and 2008–09|
ABS SDAC 2003; Census 2006; Estimated Resident Population at 30 June 2007 and 30 June 2008
The AIHW provides a variety of products that draw upon the CSTDA NMDS. Published products available on the AIHW website are:
The ABS website provides information and data on the ERP, Census Need for Assistance and SDAC profound/ severe core-activity limitation. Detailed data extractions are available through the National Information Referral Service (cost-recovery applies).
Information to assist in interpretation of the performance indicator is contained in the NDA performance indicator glossary, which accompanies these Data Quality Statements.
Supporting information on the quality and use of the CSTDA NMDS are published annually in ‘Disability support services’ available in hard copy or on the AIHW website (<www.aihw.gov.au>).
Data from several different sources, each referencing different time periods, are used to produce performance indicator (c). Data used are from the CSTDA NMDS 2007–08 and 2008–09, SDAC 2003, ERP June 2007 and June 2008, and Census 2006. This may reduce the overall accuracy of the estimates. In particular,
For example, differences across the states and territories in the predominant model of accommodation support lead to differences in the number of people accessing those services. Caution is recommended in the use or interpretation of performance at the service type level. There is a risk when service type level data is interpreted in isolation as various service types are complementary and the emphasis on different services reflects jurisdictional policy directions. For more information, see Disability support services 2007–08 and Disability support services 2008–09 (forthcoming).
Potential sources of error in the CSTDA NMDS are data items for which the response is not stated or not collected. If the characteristics of the people for whom the information is not available are different to those people for whom information is reported, there is potential for bias to be introduced into the data. Not stated/not collected rates vary substantially across jurisdictions and data items. The data item need for assistance has a particularly high not stated/not collected rate. For the 2007–08 data set the rate was 20.3% overall, ranging from 5.3% for Tasmania to 40.2% for Victoria. For the 2008–09 data set the rate was 14.1% overall, ranging from 0.2% for Australian Government agencies to 41.8% for Victorian agencies.
For general issues relating to the CSTDA NMDS, refer to the CSTDA NMDS Data Quality Statement.
|Implementation start date:||06/07/2011|
|Related metadata references:|
Has been superseded by National Disability Agreement: (c)-Proportion of the potential population accessing disability services, 2012 QS
Has been superseded by National Disability Agreement: PI d-Proportion of people with disability accessing disability services, 2013 QS
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