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National Core Maternity Indicators: PI 03–Episiotomy for females giving birth for the first time and giving birth vaginally, 2018

Identifying and definitional attributes

Metadata item type:Help on this termIndicator
Indicator type:Help on this termIndicator
Common name:Help on this term

Episiotomy for females giving birth for the first time and giving birth vaginally

Short name:Help on this termPI 03–Episiotomy for females giving birth for the first time and giving birth vaginally, 2018
METeOR identifier:Help on this term690076
Registration status:Help on this termHealth, Standard 06/09/2018
Description:Help on this term

Among all females who had their first baby (a) the proportion who received an episiotomy during a non-instrumental vaginal birth, and (b) the proportion who received an episiotomy during an instrumental vaginal birth.

Rationale:Help on this term

This indicator is used to benchmark practice.

Indicator set:Help on this termNational Core Maternity Indicators, 2018 Health, Standard 06/09/2018

Collection and usage attributes

Computation description:Help on this term

(a) The number of females having their first baby who had an episiotomy during a non-instrumental vaginal birth, divided by the number of females having their first baby who gave birth vaginally and had a non-instrumental vaginal birth, and multiplied by 100.

(b) The number of females having their first baby who had an episiotomy during an instrumental vaginal birth, divided by the number of females having their first baby who gave birth vaginally and had an instrumental vaginal birth, 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 gave birth for the first time and had a vaginal birth, with or without instruments. Females who had a multiple birth are included if this was the first time they had given birth.

Excluded are those females who did not give birth for the first time or gave birth by caesarean section.

Instrumental vaginal birth means that the baby was delivered with the use of forceps or vacuum extraction.

Computation:Help on this term

100 × (Numerator ÷ Denominator)

Numerator:Help on this term

(a) The number of females having their first baby who had an episiotomy during a non-instrumental vaginal birth.

(b) The number of females having their first baby who had an episiotomy during an instrumental vaginal birth.

Numerator data elements:Help on this term
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—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 (mother)—postpartum perineal status, code N[N]
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

This data item (code 5) was used for 2014 onwards analysis.

Data source type: Administrative by-product data


Data Element / Data SetFemale (mother)—postpartum perineal status, code N
Data Source
Perinatal National Minimum Data Set (NMDS)
NMDS / DSS
Perinatal NMDS 2013-14
Guide for use

This data item (code 5 & 6) was used for 2004 to 2013 analysis.

Data source type: Administrative by-product data


Denominator:Help on this term

(a) The number of females having their first baby who gave birth vaginally and had a non-instrumental vaginal birth

(b) The number of females having their first baby who gave birth vaginally and had an instrumental vaginal birth.

Denominator data elements:Help on this term
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—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


Disaggregation:Help on this term
  • Year of birth
  • State or territory of birth
  • Mother's age at birth
  • Hospital annual number of births
  • Hospital sector
  • Primary Health Network (from mother's area of usual residence)
  • Statistical local area 3 (from mother's area of usual residence)
Disaggregation data elements:Help on this term
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 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 SetData Element

Hospital sector


Data Source
AIHW National Perinatal Data Collection (NPDC)
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
Comments:Help on this term

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.

In 2004-2013 analysis, total number of episiotomy was been calculated using the perineal status item in the Perinatal NMDS 2013-14, by combining code 5 (episiotomy) and 6 (combined laceration and episiotomy). However, there is no information on the degree of laceration on code 6. Therefore, there is an undercount in the degree of laceration.

In 2014, there was a revision of the perineal status data items in the Perineal NMDS 2014-2018 from 2014. This meant that the perineal status was split between seven perineal status data items, which captures the perineal status relevant to each delivery. As a result, the episiotomy can be calculated using one data item, Perineal status: Episotomy (code 5). Note that a female can have both an episiotomy and recorded laceration, the new data item has been operationalised to allow this.

Source of definition: Core Maternity Indicator Project, Indicator 4 (WHA 2007).

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 term

N[NN.N]

Data source attributes

Data sources:Help on this term
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:Help on this term

Australian Institute of Health and Welfare.

Reference documents:Help on this term

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:Help on this term

Supersedes National Core Maternity Indicators: PI 03—Episiotomy for women giving birth for the first time and giving birth vaginally (2016) Health, Superseded 06/09/2018

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