A percentile is a value that divides the distribution of a particular data item into 100 groups having equal frequencies. The 90th percentile indicates that 90 percent of the values of the data item lie at or below the 90th percentile.
Abduction, harassment and other offences against the person
Acts intended to threaten or harass, or acts that unlawfully deprive another person of their freedom of movement, that are against that person's will or against the will of any parent, guardian or other person having lawful custody or care of that person.
Aboriginal and Torres Strait Islander prisoners
A prisoner who self identifies as being of Aboriginal or Torres Strait Islander origin, or both.
Acts intended to cause injury
Acts, excluding attempted murder and those resulting in death, which are intended to cause non-fatal injury or harm to another person and where there is no sexual or acquisitive element.
An adult prisoner is a person who is aged 18 years and over in all states and territories except Queensland where an adult prisoner is a person aged 17 years and over (see Explanatory Notes, paragraph 10).
Age standardisation is a statistical method that adjusts crude rates to account for age differences between study populations. Age standardisation enables better comparisons between different populations. In the context of such a comparison, the key variable of interest is the ratio of rates, rather than the age standardised rates alone (see Explanatory Notes, paragraphs 65–71).
The longest period that the convicted prisoner may be detained for the current sentenced offences in the current episode. This is also the maximum sentence length for a convicted prisoner for the current episode.
Country of birth
Country of birth information is classified according to the Standard Classification of Countries (SACC), Second edition (cat. no. 1269.0) (see Explanatory Notes, paragraph 83).
Crude imprisonment rates
Crude imprisonment rates are calculated by dividing the number of prisoners in the reference period, by the total adult population, multiplied by 100,000 to give a crude rate per 100,000 adult population. Crude rates measure the actual rates of imprisonment and are not adjusted for any differences in population structures that may influence the rates. As such, it is preferable to use age standardised rates when comparing rates of imprisonment for Aboriginal and Torres Strait Islander and non-Indigenous populations.
Dangerous or negligent acts endangering persons
Dangerous or negligent acts which, though not intended to cause harm, actually or potentially result in injury to oneself or another person.
Date of reception
The date the prisoner was received into prison for the current episode.
A continuous period of imprisonment (see Explanatory Notes, paragraphs 13–14).
Expected time to serve
The period of imprisonment that a convicted prisoner is expected to serve. In most cases this refers to the time between the date of reception for this episode and the earliest date of release (see Explanatory Notes, paragraphs 17–46). This is also the minimum sentence length for a convicted prisoner for the current episode.
An offender on parole, in the community (i.e. not in custody) who is under the authority of the corrective services agency, with at least one offence against Commonwealth/federal legislation that has an associated Commonwealth parole order, in the current episode.
A sentenced prisoner in custody in an adult corrective services institution with at least one offence against Commonwealth/federal legislation in the current episode.
Fine default only
A type of sentence where persons are serving a sentence for non-payment of a fine and are subject to no other sentence type at the time. Persons who are serving fine default sentences while on remand are counted as sentenced (fine default) prisoners. Persons who are serving fine default sentences concurrently with other sentences of imprisonment are counted under the other sentence type and not as fine default only prisoners.
A type of sentence where there is no minimum term or non-parole period set. The prisoner is required to serve the whole sentence, less any remission allowed, in custody and when released from custody is not subject to any further correctional intervention.
Fraud, deception and related offences
Offences involving a dishonest act or omission carried out with the purpose of deceiving to obtain a benefit.
Homicide and related offences
The unlawful killing, attempted unlawful killing or conspiracy to kill another person.
Illicit drug offences
The possessing, selling, dealing or trafficking, importing or exporting, manufacturing or cultivating of drugs or other substances prohibited under legislation.
Imprisonment rates are expressed as the number of persons in prison per 100,000 adult population. Imprisonment rates enable comparison of different prisoner populations based on age, sex, Indigenous status, country of birth, and state and territory.
Types of sentences where persons are sentenced to life imprisonment with no prescribed minimum time to serve. This does not necessarily mean, however, that the person will be held in custody for the term of their natural life. This category includes Indeterminate – life; Indeterminate – Governor's/HM Pleasure; or Indeterminate – subject to ministerial/administrative decision.
The state or territory in which a prisoner is held in custody, regardless of which state or territory has imposed the sentence being served (see Explanatory Notes, paragraphs 11 and 87).
The legal status of an offender is determined by the warrant/s or court order/s which provide the legal basis for the detention in custody of the offender. The legal status of sentenced includes: no appeal current; awaiting appeal; unfit to plead; and not guilty on grounds of insanity. A legal status of unsentenced includes: unconvicted awaiting court hearing or trial; awaiting sentence; and awaiting deportation. A legal status of post-sentence is where a prisoner is subject to extended detention in prison following the completion of a custodial sentence.
Level of court
A separate tier of the court system, each of which is established under legislation and has certain prescribed powers. Court levels are distinguished from one another on the basis of the extent of their legal powers.
Life with minimum
A type of sentence where persons are sentenced to life imprisonment, where a minimum time to serve in custody has been specified by the court.
Maximum-minimum (or max-min)
A type of sentence where persons may be eligible to be released on parole after serving a minimum term in custody, and who must be released once a maximum term has been served.
The arithmetic average.
The middle value of a set of values when the values are sorted in order.
Offences involving the breach of statutory rules or regulations governing activities that are prima facie legal, where such offences are not explicitly dealt with under any other division of ANZSOC, including:
- defamation, libel and privacy offences
- public health and safety offences
- commercial/industry/financial regulations
- other miscellaneous offences.
Most serious charge
Historically, for unsentenced prisoners, whether convicted or not, the most serious charge is the charge which carries the longest statutory maximum penalty. From 2006, the Prisoner Census moved towards the use of the National Offence Index for determining most serious charge (see Explanatory Notes
, paragraph 86).
Most serious offence
For sentenced prisoners, the most serious offence is the offence for which the prisoner has received the longest sentence in the current episode for a single count of the offence, except for Tasmania (see Explanatory Notes
, paragraphs 84–85).
Offences against justice procedures, government security and operations
An act or omission that is deemed to be prejudicial to the effective carrying out of justice procedures or any government operations. This includes general government operations as well as those specifically concerned with maintaining government security.
Other indeterminate sentence
Includes two sentence types: Indeterminate – Governor's/Her Majesty's Pleasure or Indeterminate – subject to ministerial/administrative decision.
An indeterminate sentence determination whereby persons are declared as habitual criminals, or persons are either permanently or temporarily deemed not responsible for their actions because of a mental disorder or intellectual disability. Such prisoners are detained and do not have a release date set. That is, the prisoner may be released at any time, at the discretion of the administrative body within each jurisdiction responsible for making that decision. This includes all Indeterminate sentences, except for Indeterminate – Life.
A type of sentence where persons are in custody for two consecutive days in a week (periodic detainee week), but remain at liberty during the rest of the week. From 1 July 2016, periodic detention was no longer a sentencing option in the Australian Capital Territory. Periodic detention ceased to be a sentencing option in New South Wales from 1 October, 2010. For 2017, the prisoners were out of scope for the collection.
Post-sentence detention orders
A post-sentence detention order is an order which subjects an offender to extended detention in prison following the completion of a custodial sentence. Post-sentence detention orders are made by a court where an offender has a history of serious offending, usually involving sexual or violent offences, and it determines that there is an unacceptable risk that the offender will commit further similar offences if released from prison.
Persons known to have been imprisoned under sentence in an adult prison. Prior sentence of periodic detention is included as prior imprisonment. Prisoners who have had previous adult imprisonment in another state or territory may not be counted as having prior imprisonment.
A person held in custody. For the purposes of this collection, prisoners are those whose confinement is the responsibility of a corrective services agency.
Prohibited and regulated weapons and explosives offences
Offences involving prohibited or regulated weapons and explosives.
Property damage and environmental pollution
The wilful and unlawful destruction, damage or defacement of public or private property, or the pollution of property or a definable entity held in common by the community.
Public order offences
Offences relating to personal conduct that:
- involves or may lead to a breach of public order and decency, or
- is indicative of criminal intent, or
- is otherwise regulated or prohibited on moral or ethical grounds.
In general these offences do not involve a specific victim or victims, however some offences, such as offensive language and offensive behaviour, may be directed towards a single victim.
Remand prisoners (remandees)
Remand prisoners are those persons who have been placed in custody while awaiting the outcome of their court hearing. They may be unconvicted (remanded in custody for trial), convicted but awaiting sentence (remanded in custody for sentence) or awaiting deportation. Some sentenced prisoners also have active remand warrants against them. In such cases, these prisoners are counted as sentenced.
Robbery, extortion and related offences
Acts intended to unlawfully gain money, property or other items of value from, or to cause detriment to, another person by using the threat of force or any other coercive measure.
Sentenced in the last 12 months
Prisoners whose date of aggregate sentence commenced between 1 July in the preceding year and 30 June in the current year. The date the aggregate sentence commenced is based on a determination made by a sentencing judicial officer. This date may take into consideration time on remand or sentences currently being served.
Sentenced prisoners are those persons who have received a term of imprisonment from a court. This includes offenders who have been given an indeterminate sentence or custodial order, for example, persons detained under the 'Governor's/HM's Pleasure' and 'Forensic Patients', or those who have received a life sentence. Prior to 2017, periodic detainees in New South Wales and the Australian Capital Territory were also included.
Sexual assault and related offences
Acts, or intents of acts, of a sexual nature against another person which are non-consensual or consent is proscribed.
Theft and related offences
The unlawful taking or obtaining of money or goods not involving the use of force, threat of force or violence, coercion or deception, with the intent to permanently or temporarily deprive the owner or possessor of the use of the money or goods, or the receiving or handling of money or goods obtained unlawfully.
Time on remand
For unsentenced prisoners, time on remand is calculated as the period between the date of reception and the prisoner census date. Time on remand data in this publication refers to time on remand to date as at 30 June of the reference year and not the total time spent on remand. Time on remand is influenced by a number of factors, particularly the time it takes for a case to come before a court. Mean and median time on remand is not representative of the total time spent on remand for all prisoners.
Traffic and vehicle regulatory offences
Offences relating to vehicles and most forms of road traffic, including offences pertaining to the licensing, registration, roadworthiness or use of vehicles, bicycle offences and pedestrian offences.
Unlawful entry with intent/burglary, break and enter
The unlawful entry of a structure with the intent to commit an offence where the entry is either forced or unforced.
A legal status indicating that a person is confined to custody on remand while awaiting the outcome of their trial. They may be unconvicted (remanded in custody for trial), convicted but awaiting sentence (remanded in custody for sentence) or awaiting deportation.