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Birth event—birth plurality, code N

Identifying and definitional attributes

Metadata item type:Help on this termData Element
Short name:Help on this termBirth plurality
Synonymous names:Help on this termMultiple birth
METEOR identifier:Help on this term269994
Registration status:Help on this term
  • Health, Superseded 07/03/2014
Definition:Help on this term

The number of babies resulting from a single pregnancy, as represented by a code.

Data Element Concept:Birth event—birth plurality

Value domain attributes

Representational attributes

Representation class:Help on this termCode
Data type:Help on this termNumber
Format:Help on this termN
Maximum character length:Help on this term1
Permissible values:Help on this term
ValueMeaning
1Singleton
2Twins
3Triplets
4Quadruplets
5Quintuplets
6Sextuplets
8Other
Supplementary values:Help on this term
ValueMeaning
9Not stated

Data element attributes

Collection and usage attributes

Guide for use:Help on this term

Plurality of a pregnancy is determined by the number of live births or by the number of fetuses that remain in utero at 20 weeks gestation and that are subsequently born separately. In multiple pregnancies, or if gestational age is unknown, only live births of any birthweight or gestational age, or fetuses weighing 400 g or more, are taken into account in determining plurality. Fetuses aborted before 20 completed weeks or fetuses compressed in the placenta at 20 or more weeks are excluded.

Collection methods:Help on this term

This data should be collected routinely for persons aged 28 days or less.

Source and reference attributes

Submitting organisation:Help on this term

National Perinatal Data Development Committee

Relational attributes

Related metadata references:Help on this term
Supersedes PDFBirth plurality, version 1, DE, NHDD, NHIMG, Superseded 01/03/2005.pdf (15.6 KB) No registration status
Has been superseded by Birth event—birth plurality, code N
  • Health, Superseded 02/08/2017
  • Indigenous, Superseded 22/10/2018
Implementation in Data Set Specifications:Help on this term
All attributes +

Health care client identificationHealth, Superseded 04/05/2005

Health care client identification DSSHealth, Superseded 03/12/2008

Health care client identification DSSHealth, Retired 20/03/2013

DSS specific attributes +

DSS specific information:

While this piece of information is normally recorded for multiple births against the mother's record, if the health care client volunteers the information, it should be recorded.


Perinatal NMDSHealth, Superseded 07/12/2005

DSS specific attributes +

Implementation start date: 01/07/2005

Implementation end date: 30/06/2006


Perinatal NMDSHealth, Superseded 06/09/2006

DSS specific attributes +

Implementation start date: 01/07/2006

Implementation end date: 30/06/2007


Perinatal NMDS 2007-2008Health, Superseded 05/02/2008

DSS specific attributes +

Implementation start date: 01/07/2007

Implementation end date: 30/06/2008


Perinatal NMDS 2008-2010Health, Superseded 02/12/2009

DSS specific attributes +

Implementation start date: 01/07/2008

Implementation end date: 30/06/2010


Perinatal NMDS 2010-2011Health, Superseded 21/12/2010

DSS specific attributes +

Implementation start date: 01/07/2010

Implementation end date: 30/06/2011

DSS specific information:

National Minimum Data Set (NMDS) Perinatal:

Multiple pregnancy increases the risk of complications during pregnancy, labour and delivery and is associated with higher risk of perinatal morbidity and mortality.

Plurality of pregnancy is determined by the number of babies that are in scope for the Perinatal NMDS (i.e. births of at least 20 weeks gestation or at least 400g birth weight).  In the case of multiple pregnancies, if one or more fetuses were removed from the uterus before 20 weeks gestation, for example, by abortion (spontaneous, induced or fetal reduction) they are not considered in determining the birth plurality.  For example, in a twin pregnancy, where one twin is aborted before 20 weeks gestation and the remaining twin is born and is in scope for the Perinatal NMDS, plurality is coded as ‘1 Singleton’.  If both twins are born at 20 weeks gestation or more, plurality is coded as ‘2 Twins’.

This item is collected for the mother only.


Perinatal NMDS 2011-12Health, Superseded 07/03/2012

DSS specific attributes +

Implementation start date: 01/07/2011

Implementation end date: 30/06/2012

DSS specific information:

National Minimum Data Set (NMDS) Perinatal:

Multiple pregnancy increases the risk of complications during pregnancy, labour and delivery and is associated with higher risk of perinatal morbidity and mortality.

Plurality of pregnancy is determined by the number of babies that are in scope for the Perinatal NMDS (i.e. births of at least 20 weeks gestation or at least 400g birth weight). In the case of multiple pregnancies, if one or more fetuses were removed from the uterus before 20 weeks gestation, for example, by abortion (spontaneous, induced or fetal reduction) they are not considered in determining the birth plurality. For example, in a twin pregnancy, where one twin is aborted before 20 weeks gestation and the remaining twin is born and is in scope for the Perinatal NMDS, plurality is coded as ‘1 Singleton’. If both twins are born at 20 weeks gestation or more, plurality is coded as ‘2 Twins’.

This item is collected for the mother only.


Perinatal NMDS 2012-13Health, Superseded 07/02/2013

DSS specific attributes +

Implementation start date: 01/07/2012

Implementation end date: 30/06/2013

DSS specific information:

National Minimum Data Set (NMDS) Perinatal:

Multiple pregnancy increases the risk of complications during pregnancy, labour and delivery and is associated with higher risk of perinatal morbidity and mortality.

Plurality of pregnancy is determined by the number of babies that are in scope for the Perinatal NMDS (i.e. births of at least 20 weeks gestation or at least 400g birth weight). In the case of multiple pregnancies, if one or more fetuses were removed from the uterus before 20 weeks gestation, for example, by abortion (spontaneous, induced or fetal reduction) they are not considered in determining the birth plurality. For example, in a twin pregnancy, where one twin is aborted before 20 weeks gestation and the remaining twin is born and is in scope for the Perinatal NMDS, plurality is coded as ‘1 Singleton’. If both twins are born at 20 weeks gestation or more, plurality is coded as ‘2 Twins’.

This item is collected for the mother only.


Perinatal NMDS 2013-14Health, Superseded 07/03/2014

DSS specific attributes +

Implementation start date: 01/07/2013

Implementation end date: 30/06/2014

DSS specific information:

National Minimum Data Set (NMDS) Perinatal:

Multiple pregnancy increases the risk of complications during pregnancy, labour and delivery and is associated with higher risk of perinatal morbidity and mortality.

Plurality of pregnancy is determined by the number of babies that are in scope for the Perinatal NMDS (i.e. births of at least 20 weeks gestation or at least 400g birth weight). In the case of multiple pregnancies, if one or more fetuses were removed from the uterus before 20 weeks gestation, for example, by abortion (spontaneous, induced or fetal reduction) they are not considered in determining the birth plurality. For example, in a twin pregnancy, where one twin is aborted before 20 weeks gestation and the remaining twin is born and is in scope for the Perinatal NMDS, plurality is coded as ‘1 Singleton’. If both twins are born at 20 weeks gestation or more, plurality is coded as ‘2 Twins’.

This item is collected for the mother only.


Implementation in Indicators:Help on this term
Used as Numerator

Indigenous primary health care: PI02a-Number of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2013Health, Superseded 21/11/2013
Indigenous, Superseded 21/11/2013

Indigenous primary health care: PI02a-Number of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2014Health, Superseded 13/03/2015
Indigenous, Superseded 13/03/2015

Indigenous primary health care: PI02b-Proportion of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2013Health, Superseded 21/11/2013
Indigenous, Superseded 21/11/2013

Indigenous primary health care: PI02b-Proportion of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2014Health, Superseded 13/03/2015
Indigenous, Superseded 13/03/2015

National Core Maternity Indicators: PI 05-Induction of labour for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 06-Caesarean section for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 07-Normal (non-instrumental) vaginal birth for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 08-Instrumental vaginal birth for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Health Performance Authority Healthy Communities: Percentage of live singleton births that were of low birthweight, 2007–2011 National Health Performance Authority (retired), Retired 01/07/2016

National Healthcare Agreement: P01-Proportion of babies born with low birth weight, 2010Health, Superseded 08/06/2011

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2011Health, Superseded 30/10/2011

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2012Health, Superseded 25/06/2013

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2013Health, Superseded 30/04/2014

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2014Health, Superseded 14/01/2015

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2015Health, Superseded 08/07/2016

National Healthcare Agreement: PI 01–Proportion of babies born of low birth weight, 2016Health, Superseded 31/01/2017

National Healthcare Agreement: PI 01–Proportion of babies born of low birth weight, 2017Health, Superseded 30/01/2018

National Indigenous Reform Agreement: P12-Proportion of babies born of low birth weight, 2010Community Services (retired), Superseded 04/04/2011

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2013Indigenous, Superseded 13/12/2013

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2014Indigenous, Superseded 24/11/2014

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2015Indigenous, Superseded 18/11/2015

National Indigenous Reform Agreement: PI 07—Proportion of babies born of low birthweight, 2016Indigenous, Superseded 01/07/2016

National Indigenous Reform Agreement: PI 07—Proportion of babies born of low birthweight, 2017Indigenous, Superseded 06/06/2017

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2018Indigenous, Superseded 31/07/2018

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2019Indigenous, Superseded 23/08/2019

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2020Indigenous, Standard 23/08/2019

National Indigenous Reform Agreement: PI 12-Proportion of babies born of low birth weight, 2011Indigenous, Superseded 01/07/2012

National Indigenous Reform Agreement: PI 12-Proportion of babies born of low birth weight, 2012Indigenous, Superseded 13/06/2013

Used as Denomirator

Indigenous primary health care: PI02b-Proportion of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2013Health, Superseded 21/11/2013
Indigenous, Superseded 21/11/2013

Indigenous primary health care: PI02b-Proportion of Indigenous babies born within the previous 12 months whose birth weight results were low, normal or high, 2014Health, Superseded 13/03/2015
Indigenous, Superseded 13/03/2015

National Core Maternity Indicators: PI 05-Induction of labour for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 06-Caesarean section for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 07-Normal (non-instrumental) vaginal birth for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Core Maternity Indicators: PI 08-Instrumental vaginal birth for selected women giving birth for the first time (2013)Health, Superseded 02/02/2016

National Health Performance Authority Healthy Communities: Percentage of live singleton births that were of low birthweight, 2007–2011 National Health Performance Authority (retired), Retired 01/07/2016

National Healthcare Agreement: P01-Proportion of babies born with low birth weight, 2010Health, Superseded 08/06/2011

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2011Health, Superseded 30/10/2011

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2012Health, Superseded 25/06/2013

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2013Health, Superseded 30/04/2014

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2014Health, Superseded 14/01/2015

National Healthcare Agreement: PI 01-Proportion of babies born of low birth weight, 2015Health, Superseded 08/07/2016

National Healthcare Agreement: PI 01–Proportion of babies born of low birth weight, 2016Health, Superseded 31/01/2017

National Healthcare Agreement: PI 01–Proportion of babies born of low birth weight, 2017Health, Superseded 30/01/2018

National Indigenous Reform Agreement: P12-Proportion of babies born of low birth weight, 2010Community Services (retired), Superseded 04/04/2011

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2013Indigenous, Superseded 13/12/2013

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2014Indigenous, Superseded 24/11/2014

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birth weight, 2015Indigenous, Superseded 18/11/2015

National Indigenous Reform Agreement: PI 07—Proportion of babies born of low birthweight, 2016Indigenous, Superseded 01/07/2016

National Indigenous Reform Agreement: PI 07—Proportion of babies born of low birthweight, 2017Indigenous, Superseded 06/06/2017

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2018Indigenous, Superseded 31/07/2018

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2019Indigenous, Superseded 23/08/2019

National Indigenous Reform Agreement: PI 07-Proportion of babies born of low birthweight, 2020Indigenous, Standard 23/08/2019

National Indigenous Reform Agreement: PI 12-Proportion of babies born of low birth weight, 2011Indigenous, Superseded 01/07/2012

National Indigenous Reform Agreement: PI 12-Proportion of babies born of low birth weight, 2012Indigenous, Superseded 13/06/2013

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