The Alcohol and Other Drug Treatment Services National Minimum Data Set (AODTS NMDS) is the primary source used in this analysis. It provides information on the treatment provided by publicly-funded alcohol and other drug treatment agencies in Australia. These services are available to people seeking treatment for their own drug use and people seeking treatment for someone else's drug use. Data are available from 2003–04 onwards.
In the AODTS NMDS, the main counting unit is a closed treatment episode, which is defined as a period of contact between a client and a treatment provider (or team of providers) that is closed when treatment is completed or has ceased, or there has been no further contact between the client and the treatment provider for 3 months. Since 2012–13, a statistical linkage key (SLK) has been collected which means the number of clients receiving treatment can now be estimated .
A number of other data sources include information not available in the AODTS NMDS. Using these additional data sets supports more comprehensive reporting of alcohol and other drug treatment in Australia. These include the National Opioid Pharmacotherapy Statistics Annual Data Collection (NOPSAD), the National Hospital Morbidity Database, Aboriginal and Torres Strait Islander health organisations: Online Services Report Database, the Specialist Homelessness Services (SHS) Collection and the National Prisoner Health Data Collection (NPHDC).
In 2015, of the 1,011 prison entrants in the National Prisoner Health Collection (NPHDC), two-thirds (67%) reported using illicit drugs in the previous 12 months—1 in 2 (50%) reported using methamphetamines, and 2 in 5 (41%) cannabis.
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