National Core Maternity Indicators: PI 15–Females having their second birth vaginally whose first birth was by caesarean section, 2019

Identifying and definitional attributes

Metadata item type:Indicator
Indicator type:Indicator
Common name:

Females having their second birth vaginally whose first birth was by caesarean section

Short name:PI 15–Females having their second birth vaginally whose first birth was by caesarean section, 2019
METeOR identifier:717550
Registration status:Health, Standard 19/06/2019
Description:

The proportion of all females having their second birth vaginally whose first birth was by caesarean section.

Rationale:

The indicator is used to benchmark practice for vaginal birth following caesarean section.

Indicator set:National Core Maternity Indicators, 2019 Health, Standard 19/06/2019

Collection and usage attributes

Computation description:

The number of females having their second birth vaginally whose first birth was by caesarean section, divided by the number of females having their second birth whose first birth was by caesarean section, and multiplied by 100.

A birth is defined as an event in which a baby comes out of the uterus after a pregnancy of at least 20 weeks gestation or weighing 400 grams or more.

Included are those females who are having a singleton for their second birth and whose first birth was by caesarean section.

Excluded are those females whose second birth is a multiple birth, those who are not having their second birth, and those who are having their second birth and whose first birth was a vaginal birth.

Computation:

100 × (Numerator ÷ Denominator)

Numerator:

The number of females having their second birth vaginally whose first birth was by caesarean section.

Numerator data elements:
Data Element / Data SetFemale—parity, total pregnancies N[N]
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetBirth event—birth method, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetFemale—caesarean section at most recent previous birth indicator, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

This data item was used for 2014 onwards analysis.

Data source type: Administrative by-product data.


Data Element / Data SetFemale—caesarean section indicator (last previous birth) code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

This data item was used for 2007-2013 analysis.

Data source type: Administrative by-product data.


Denominator:

The number of females having their second birth whose first birth was by caesarean section.

Denominator data elements:
Data Element / Data SetFemale—parity, total pregnancies N[N]
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetFemale—caesarean section at most recent previous birth indicator, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

This data item was used for 2014 onwards analysis.

Data source type: Administrative by-product data.


Data Element / Data SetFemale—caesarean section indicator (last previous birth) code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

This data item was used for 2007-2013 analysis.

Data source type: Administrative by-product data.


Disaggregation:
  • Year of birth
  • State or territory of birth
  • Mother's age at birth
  • Hospital annual number of births
  • Hospital sector
  • Remoteness category (from mother's area of usual residence)
  • Indigenous status of mother
  • Primary Health Network (from mother's area of usual residence)
  • Statistical local area 3 (from mother's area of usual residence)
Disaggregation data elements:
Data Element / Data SetPerson—Indigenous status, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetPerson—date of birth, DDMMYYYY
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetData Element

Hospital annual number of births


Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetPerson—area of usual residence, statistical area level 2 (SA2) code (ASGS 2016) N(9)
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetBirth event—state/territory of birth, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetData Element

Hospital sector


Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

Data source type: Administrative by-product data


Comments:

Data elements are from the Perinatal National Minimum Data Set (NMDS) or have been provided as voluntary non-standardised items by the states and territories. Records with data that are missing, not stated or not interpretable have been excluded from the denominator.

From 2014, Female—caesarean section at most recent previous birth indicator, code N data item was introduced into the Perinatal NMDS. Although not an NMDS/DSS item prior to 2014, data items appear to match the data element developed by NPDDC, Female—caesarean section indicator (last previous birth) code N. As a result, data from Victoria were not available in 2007 to 2009, and Western Australia in 2013.  

Modified from Australian Council on Healthcare Standards (ACHS) Indicator 2.1: Vaginal birth following caesarean section. This ACHS indicator is based on the definition by Women's Healthcare Australasia Core Maternity Indicators Project (WHA 2007).

Representational attributes

Representation class:Percentage
Data type:Real
Unit of measure:Person
Format:

N[NN.N]

Data source attributes

Data sources:
Data SourcePerinatal National Minimum Data Set (NMDS)
Frequency
Annual
Data custodian

Australian Institute of Health and Welfare



Data SourceAIHW National Perinatal Data Collection (NPDC)
Frequency
Calendar years ending 31 December each year
Data custodian

Australian Institute of Health and Welfare


Source and reference attributes

Submitting organisation:

Australian Institute of Health and Welfare

Reference documents:

ACHS (The Australian Council on Healthcare Standards, Health Services Research Group, University of Newcastle) 2014. The Australasian Clinical Indicator Report: 2006-2013. 15th edn. Sydney: ACHS. Viewed 9 April 2018, https://www.achs.org.au/media/88679/clinical_indicator_report_2006_2013.pdf.

WHA (Women's Healthcare Australasia) 2007. Supporting excellence in maternity care: the core maternity indicators project: findings from the core maternity indicators project. Canberra: WHA.

Relational attributes

Related metadata references:

Supersedes National Core Maternity Indicators: PI 15–Females having their second birth vaginally whose first birth was by caesarean section, 2018 Health, Superseded 19/06/2019