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National Core Maternity Indicators: PI 08-Instrumental vaginal birth for selected women giving birth for the first time (2013)

Identifying and definitional attributes

Metadata item type:Help on this termIndicator
Indicator type:Help on this termIndicator
Common name:Help on this termInstrumental vaginal birth for selected women giving birth for the first time.
Short name:Help on this termPI 08-Instrumental vaginal birth for selected women giving birth for the first time (2013)
METeOR identifier:Help on this term557093
Registration status:Help on this termHealth, Superseded 02/02/2016
Description:Help on this termThe proportion of all women who met the selection criteria* and who had a vaginal birth with the assistance of instruments.
Rationale:Help on this termThis indicator is used to benchmark practice.
Indicator set:Help on this termNational Core Maternity Indicators (2013) Health, Superseded 02/02/2016

Collection and usage attributes

Population group age from:Help on this term20 years
Population group age to:Help on this term34 years
Computation description:Help on this term

The proportion of all women who met the selection criteria* and who had a vaginal birth with the assistance of instruments.

* Selection criteria: Women included are those who gave birth for the first time and met all of the following criteria for selected women, defined as:

  • aged between 20 and 34 years
  • gestational age at birth between 37 and 41 completed weeks
  • pregnancy has one baby only (singleton)
  • the presentation of the baby is vertex (baby's head was at the cervix).

Excluded are those women who have given birth prior to the current birth or did not meet the selection criteria.

Computation:Help on this term100 × (Numerator ÷ Denominator)
Numerator:Help on this termNumber of selected women giving birth for the first time who had a vaginal birth with the assistance of instruments.
Numerator data elements:Help on this term
Data Element / Data SetBirth event—birth method, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetBirth event—birth plurality, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetProduct of conception—gestational age, completed weeks N[N]
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetFemale—parity, total N[N]
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetPerson—date of birth, DDMMYYYY
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetBirth event—birth presentation, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Denominator:Help on this termAll selected women.
Denominator data elements:Help on this term
Data Element / Data SetPerson—date of birth, DDMMYYYY
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetBirth event—birth plurality, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetFemale (pregnant)—estimated gestational age, total weeks NN
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetBirth event—birth presentation, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetFemale—parity, total N[N]
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Disaggregation:Help on this term
  • Year of birth
  • State or territory of birth
  • Hospital annual number of births
  • Remoteness category (from mother's area of usual residence)
  • Indigenous status of mother
  • Hospital sector
  • Patient elected accommodation status
Disaggregation data elements:Help on this term
Data Element / Data SetEstablishment—organisation identifier (Australian), NNX[X]NNNNN
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetBirth event—state/territory of birth, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetPerson—Indigenous status, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetEpisode of admitted patient care—patient election status, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Data Element / Data SetPerson—date of birth, DDMMYYYY
Data Source
AIHW National Perinatal Data Collection (NPDC)
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, geographical location code (ASGC 2010) NNNNN
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use
Data source type: Administrative by-product data
Comments:Help on this termData 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 included in the denominator.

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

Gestational age is a clinical measure of the duration of the pregnancy. For the National Perinatal Data Collection gestational age is reported as completed weeks.

An instrumental birth is a procedure that uses instruments (forceps or vacuum extraction) to assist the baby to come out through the vagina.

Patient elected accommodation status is available for all jurisdictions from 2006.

Source of definition: Australian Council of Healthcare Standards (ACHS) indicator 1.3, Selected women giving birth for the first time who undergo an instrumental birth. The ACHS define an instrumental birth as the use of forceps or vacuum.

Representational attributes

Representation class:Help on this termPercentage
Data type:Help on this termReal
Unit of measure:Help on this termPerson
Format:Help on this termN[NN.N]

Data source attributes

Data sources:Help on this term
Data SourceAIHW National Perinatal Data Collection (NPDC)
Frequency
Calendar years ending 31 December each year
Data custodian

Australian Institute of Health and Welfare


Relational attributes

Related metadata references:Help on this term

Has been superseded by National Core Maternity Indicators: PI 08—Instrumental vaginal birth for selected women giving birth for the first time (2016) Health, Superseded 06/09/2018

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