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Under the current method for estimating final net overseas migration, this term is based on a traveller's actual duration of stay or absence using the '12/16 month rule'. Preliminary NOM estimates are modelled on patterns of traveller behaviours observed in final NOM estimates for the same period one year earlier
Net reproduction rate
The net reproduction rate represents the average number of daughters that would be born to a group of females if they are subject to the fertility and mortality rates of a given year during their future life. It indicates the extent to which the population would reproduce itself. The net reproduction rate is obtained by multiplying the age-specific birth rates (for female births only) by the proportion of survivors at corresponding ages in a life table and adding the products.
A nuptial birth is the birth of a child born of parents who are legally married at the time of the child's birth.
Nuptiality relates to the registered marital status of persons and the events such as marriages, divorces and widowhood. Confinements and births are identified as being nuptial where the father registered was married to the mother at the time of birth, or where the husband died during pregnancy. Confinements and children of Indigenous mothers considered to be tribally married are classified as nuptial. Other confinements, and the children resulting from them, are classified as ex-nuptial whether or not both parents were living together at the time of birth.
Following the 1992 amendments to the Acts Interpretation Act to include the Indian Ocean Territories of Christmas Island and the Cocos (Keeling) Islands as part of geographic Australia, another category at the state and territory level has been created, known as Other Territories. Other Territories include Jervis Bay Territory, previously included with the Australian Capital Territory, as well as Christmas Island and the Cocos (Keeling) Islands.
Parity refers to the number of live births a woman has had previous to the most recent birth. Parity is also an attribute of any live birth, being the order of that birth (e.g. first birth, second birth, and so on) of a woman.
Paternity acknowledged birth
A paternity acknowledged birth refers to an ex-nuptial birth where paternity was acknowledged (on the birth registration form).
Paternity not acknowledged birth
A paternity not acknowledged birth refers to an ex-nuptial birth where paternity was not acknowledged (on the birth registration form).
For Australia, population growth is the sum of natural increase and net overseas migration. For states and territories, population growth also includes net interstate migration. After the census, intercensal population growth also includes an allowance for intercensal discrepancy.
Previous births refer to children born alive (who may or may not be living) to a mother prior to the registration of the current birth in the processing period. In some states, legitimised and legally adopted children may also be included.
Due to variation in data collection and processing methods across states and territories, different definitions of the concept of previous births have been applied.
Changes in ABS processing of data collected by state/territory Registrars of Births, Deaths and Marriages for 2007 have resulted in the availability of improved information on previous births to mothers. Prior to 2007, ABS published information on previous births of the mother from the current relationship only, for all states and territories. From 2007, data on previous births for all relationships (both current and previous, if any) of the mother are collected for all states and territories, excluding Victoria and Queensland.
See Previous births.
Rate of population growth
Population change over a period as a proportion (percentage) of the population at the beginning of the period.
Replacement level fertility is the number of babies a female would need to have over her reproductive life span to replace herself and her partner. Given the current mortality of females up to age 49 years, replacement fertility is estimated at around 2.1 babies per female.
Women's childbearing years, usually assumed as the ages from 15 to 49 years for the purpose of analysis. In this publication, births to women less than 15 years are included in the 15 years age group and those 50 years and older are included in the 49 years age group.
The sex ratio relates to the number of males per 100 females.
State or territory of registration
State or territory of registration refers to the state or territory in which the event was registered.
State or territory of usual residence
State or territory of usual residence refers to the state or territory of usual residence of:
Statistical Division (SD)
Statistical Divisions (SD) consist of one or more Statistical Subdivisions (SSD). The divisions are designed to be relatively homogeneous regions characterised by identifiable social and economic units within the region, under the unifying influence of one or more major towns or cities. Further information concerning SDs is contained in Australian Standard Geographic Classification (ASGC) (cat. no. 1216.0).
Statistical Local Area (SLA)
Statistical Local Areas (SLA) are, in most cases, identical with, or have been formed from a division of, whole Local Government Areas (LGA). In other cases, they represent unincorporated areas. In aggregate, SLAs cover the whole of a state or territory without gaps or overlaps. In some cases, legal LGAs overlap statistical subdivision boundaries and therefore comprise two or three SLAs (Part A, Part B and, if necessary, Part C). Further information concerning SLAs is contained in Australian Standard Geographic Classification (ASGC) (cat. no. 1216.0).
Statistical Subdivision (SSD)
In aggregate, Statistical Subdivisions (SSD) cover the whole of Australia without gaps or overlaps. They are defined as socially and economically homogeneous regions characterised by identifiable links between the inhabitants. In the non-urban areas an SSD is characterised by identifiable links between the economic units within the region, under the unifying influence of one or more major towns or cities. Further information concerning SSDs is contained in Australian Standard Geographic Classification (ASGC) (cat. no. 1216.0).
Teenage fertility rate
The number of births during the calendar year to women aged 15-19 years, per 1,000 female estimated resident population aged 15-19 years at 30 June of the same year. Births to women aged under 15 years are included.
Total fertility rate
The sum of age-specific fertility rates (live births at each age of mother per female population of that age). It represents the number of children a female would bear during her lifetime if she experienced current age-specific fertility rates at each age of her reproductive life.
Usual residence within Australia refers to that address at which the person has lived or intends to live for a total of six months or more in a given reference year.
Year of occurrence
Data presented on year of occurrence basis relate to the date the birth occurred.
Year of registration
Data presented on year of registration basis relate to the date the birth was registered.
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