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QUALITY DECLARATION SUMMARY
Births data excludes:
Birth records are provided electronically to the ABS by individual Registrars on a monthly basis for compilation into aggregate statistics on a quarterly and annual basis.
Quarterly estimates of births on a preliminary basis are published five to six months after the reference period in Australian Demographic Statistics (cat. no 3101.0), and revised 21 months after the end of each financial year. Annual estimates on a year of registration basis are published within ten months of the end of the reference year in Births, Australia (cat. no. 3301.0).
Information on births is obtained from a complete enumeration of births registered during a specified period and are not subject to sampling error. However, they are subject to non-sampling error which can arise from inaccuracies in collecting, recording and processing of data. These include: misreporting of data items; non-response to particular questions; and processing errors. Every effort is made to minimise error by working closely with data providers, the careful design of forms, training of processing staff and efficient data processing procedures.
Another dimension of non-sampling error in birth registrations data is the interval between the occurrence and registration of a birth. As a result, some births occurring in one year are not registered until the following year or even later. This can be caused by either a delay by the parent(s) in submitting a completed form to the registry, or a delay by the registry in processing the birth (for example, due to follow up activity due to missing information on the form, or resource limitations).
Use of the supporting documentation released with these statistics is important for assessing coherence within the dataset and when comparing the statistics with data from other sources. Changing business rules over time and/or across state/territory registries can affect consistency and hence interpretability of statistical output. Explanatory Notes in each issue contains information pertinent to this particular release which may impact on comparison over time.
Registration of births is compulsory in Australia under relevant state/territory legislation. However, each state/territory Registrar has its own birth registration form. Most data items are collected in all states and territories and therefore statistics at a national level are available for most characteristics. In some cases, different wording of questions asked on the registration form may result in different answers which may affect final figures.
Data presented in this publication are reported by year of registration (unless otherwise stated) and differ from births statistics published in Australian Demographic Statistics (cat. no. 3101.0) which are reported on a year/quarter of occurrence basis in final and revised data for use in population estimates.
Birth registrations data are not the only statistical series on births in Australia. The National Perinatal Data Collection (NPDC) is a national collection on pregnancy and childbirth, based on births reported to the perinatal data collection in each state and territory in Australia. Midwives and other health professionals who attend births complete notification forms for each birth, using information obtained from mothers and hospital or other records. This information is compiled and published annually by the National Perinatal Statistics Unit (NPSU) of the Australian Institute of Health and Welfare (AIHW) in Australia's Mothers and Babies. As information from these two collections are from different sources, the statistics obtained vary. The number of births in the Perinatal Data Collection are generally greater, which may reflect the likelihood of parent(s) to delay or fail to register the birth of a child. For more information, see Appendix: Differences Between Collections.
Births statistics are generally straightforward and easy to interpret. It should be noted, however, that changes in numbers of births over time can be due to two factors: changes in fertility, and changes in the number of women in child-bearing ages. For this reason, births data need to be considered in relation to the size of the relevant population(s) through the use of fertility rates.
Another aspect that may be overlooked is plurality, or the fact that each birth of a multiple birth is counted individually in births data. Confinements statistics remove the effect of plurality and are used when analysing characteristics of the mother or father; for example, for calculating median ages.
Information on fertility rates as well as data sources, terminology, classifications and other technical aspects associated with the statistics presented in this publication can be found in the Explanatory Notes, Appendices and Glossary.
Births data are available in a variety of formats on the ABS website under the 3301.0 product family. The formats are:
Further information on births and fertility may be available on request. See Appendix: Characteristics Available for a list of data items available. The ABS observes strict confidentiality protocols as required by the Census and Statistics Act (1905). This may restrict access to data at a very detailed level which is sought by some users.
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