National Core Maternity Indicators: PI 02–Antenatal care visits in the first trimester for all females giving birth, 2019

Identifying and definitional attributes

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

Antenatal care visits in the first trimester

Short name:PI 02–Antenatal care visits in the first trimester for all females giving birth, 2019
METeOR identifier:717530
Registration status:Health, Standard 19/06/2019
Description:

Among all females who gave birth, the proportion who had their first antenatal care visits in the first trimester (before 14 weeks gestation).

Rationale:

This indicator is used to assess the accessibility of antenatal services.

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

Collection and usage attributes

Computation description:

The number of females who gave birth and who had their first antenatal care visit (before 14 weeks gestation), divided by the total number of females who gave birth with a stated first antenatal care visit, 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.

Gestational age is a clinical measure of the duration of the pregnancy. Gestational age at the time of the first antenatal care visit is assessed from the best estimate of gestational age available.

An antenatal care visit is an intentional encounter between a pregnant female and a midwife or doctor prior to labour to assess and improve maternal and fetal wellbeing throughout pregnancy and prior to labour.

All females who gave birth are included for the calculation of this indicator.

Computation:

100 × (Numerator ÷ Denominator)

Numerator:

The number of females who gave birth and who had their first antenatal care visit before 14 weeks gestation.

Numerator data elements:
Data Element / Data SetPregnancy—estimated duration (at the first visit for antenatal care), completed weeks 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


Denominator:

The total number of females who gave birth with a stated first antenatal care visit.

Denominator data elements:
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 SetPregnancy—estimated duration (at the first visit for antenatal care), completed weeks 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:
  • 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
  • Disadvantage quintile (from mother's area of usual residence)
  • 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 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—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 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 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 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


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.

Data for gestational age at first antenatal care visit for the National Perinatal Data Collection have been collected since 2007, but were not provided for births in all states and territories, nor were data collection practices uniform. Data was provided by New South Wales, South Australia and the Northern Territory from 2007. The Australian Capital Territory also provided data but has not agreed these are of a suitable quality for publication. Queensland provided data for births from July 2009. Many hospitals in South Australia did not provide data in 2007, though over time the number of hospitals contributing data has increased. The indicator therefore uses only records with a non-missing value for the denominator. Standardised collection of data for gestational age at first antenatal care visit using the national standard data element Pregnancy—estimated duration (at the first visit for antenatal care), completed weeks N[N] commenced for births from July 2010. In addition, there was a documented change in collection practice in New South Wales from 2011, from 'Duration of pregnancy at first antenatal visit' to 'Duration of pregnancy at first comprehensive booking or assessment by clinician' (HealthStat NSW 2016). As a result, this indicator will be published from 2011 onwards, where all states and territories provided data for this indicator.

This indicator has been developed for use by the Council of Australian Governments for monitoring the National Indigenous Reform Agreement.

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:

HealthStat NSW 2016. Antenatal care by gestational age. Viewed 23 March 2016, www.healthstats.nsw.gov.au/indicator/mum_antegage/mum_antegage_lhn_snap.

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 02–Antenatal care visits in the first trimester for all females giving birth, 2018 Health, Superseded 19/06/2019