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National Core Maternity Indicators: PI 13—Third and fourth degree tears for (a) all vaginal first births and (b) all vaginal births (2016)

Identifying and definitional attributes

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

Third and fourth degree tears for (a) all vaginal first births and (b) all vaginal births.

Short name:Help on this termPI 13—Third and fourth degree tears for (a) all vaginal first births and (b) all vaginal births (2016)
METeOR identifier:Help on this term613194
Registration status:Help on this termHealth, Superseded 06/09/2018
Description:Help on this term

The proportion of women who have a third or fourth degree perineal laceration after giving birth vaginally for (a) all first births and (b) all births.

Rationale:Help on this term

Third and fourth degree perineal lacerations cause significant ongoing maternal morbidity. This is an outcome indicator that measures their occurrence.

Indicator set:Help on this termNational Core Maternity Indicators (2016) Health, Superseded 06/09/2018

Collection and usage attributes

Computation description:Help on this term

The proportion of women who had a third or fourth degree perineal laceration after giving birth vaginally (a) for a first birth and (b) all births.

Computation:Help on this term

100 × (Numerator ÷ Denominator)

Numerator:Help on this term

(a) The number of women who had a third or fourth degree perineal laceration after giving birth for the first time and who had a vaginal birth.

(b) The number of women who had a third or fourth degree perineal laceration after giving birth vaginally.

Numerator data elements:Help on this term
Data Element / Data SetFemale—parity, total pregnancies N[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 method, code N
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetFemale (mother)—postpartum perineal status, code N[N]
Data Source
AIHW National Perinatal Data Collection (NPDC)
NMDS / DSS
Perinatal NMDS 2014-18
Guide for use

Data source type: Administrative by-product data


Denominator:Help on this term

(a) The number of women who gave birth for the first time and who had a vaginal birth.

(b) The number of women who gave birth vaginally.

Denominator data elements:Help on this term
Data Element / Data SetFemale—parity, total pregnancies N[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 method, code 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
  • Hospital sector
  • Remoteness category (from mother's area of usual residence)
  • Indigenous status of mother
  • With and without episiotomy
  • Mother's country of birth
Disaggregation data elements:Help on this term
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 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 2011) 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 SetData Element

Hospital sector


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

 Data source type: Administrative by-product data


Data Element / Data SetFemale (mother)—postpartum perineal status, code N[N]
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetPerson—country of birth, code (SACC 2011) NNNN
Data Source
AIHW National Perinatal Data Collection (NPDC)
Guide for use

 Data source type: Administrative by-product data


Comments:Help on this term

Data elements are from the Perinatal national minimum data set (NMDS). Records with data that are missing, not stated or not interpretable have been excluded from the denominator.

A birth is defined as the 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.

Births included are vaginal births, including non-instrumental and instrumental births. A non-instrumental vaginal birth is one in which the baby is born through the vagina without the assistance of instruments. An instrumental birth is a procedure that uses instruments (forceps or vacuum extraction) to assist the baby to come out through the vagina.

Births excluded are caesarean sections.

Postpartum perineal status is defined as:

1st degree laceration/vaginal graze (Code 2)—Graze, laceration, rupture or tear of the perineal skin during delivery that may be considered to be slight or that involves one or more of the following structures:

  • fourchette
  • labia
  • periurethral tissue (excluding involvement of urethra)
  • vagina
  • low vulva.

2nd degree laceration (Code 3)—Perineal laceration, rupture or tear as in Code 2 occurring during delivery, also involving:

  • pelvic floor
  • perineal muscles
  • vaginal muscles.

Excludes laceration involving the anal sphincter.

3rd degree laceration (Code 4)—Perineal laceration, rupture or tear as in Code 3 occurring during delivery, also involving:

  • anal sphincter (excluding involvement of anal or rectal mucosa)
  • rectovaginal septum
  • sphincter not otherwise specified (NOS).

Excludes laceration involving the anal or rectal mucosa.

4th degree laceration (Code 7)—Perineal laceration, rupture or tear as in Code 4 occurring during delivery, also involving:

  • anal mucosa
  • rectal mucosa.

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 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 13–Third and fourth degree tears for vaginal births, 2018 Health, Superseded 19/06/2019

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