Specifications and notes for analysis

Note: For reporting purposes, the terms 'females' and 'women' are used interchangeably.

Indicator

METeOR identifier

Indicator Set: National Core Maternity Indicators, 2020

728585

Antenatal Indicators

 

PI 01–Tobacco smoking in pregnancy for all females giving birth

728588

PI 02–Antenatal care visits in the first trimester for all females giving birth

728714

Labour and birth Indicators

 

Selected Women

 

PI 05–Induction of labour for selected females giving birth for the first time

728721

PI 06–Caesarean section for selected females giving birth for the first time

728723

PI 07–Non-instrumental vaginal birth for selected females giving birth for the first time

728725

PI 08–Instrumental vaginal birth for selected females giving birth for the first time

728728

All Women

 

PI 03–Episiotomy for females giving birth for the first time and giving birth vaginally

728716

PI 09–General anaesthetic for females giving birth by caesarean section

728730

PI 15–Females having their second birth vaginally whose first birth was by caesarean section

728736

Birth outcome indicators

 

PI 04–Apgar score of less than 7 at 5 minutes for births at or after term

728719

PI 10–Small babies among births at or after 40 weeks gestation

728732

PI 13–Third and fourth degree tears for vaginal births

728734

Notes for analysis by sub-populations

Data for all National Core Maternity Indicators (NCMI) are presented by three geographic boundaries: 

  • State and Territory of birth
  • Primary Health Network (PHN) of mother's usual residence
  • Statistical local area (SA3) of mother's usual residence 

and at the national level by:

  • hospital annual number of births 
  • hospital sector
  • mother’s Indigenous status

Some indicators are disaggregated by other data groupings where relevant.

Notes for each sub-population analysis are as follows:

State and territory of birth

Births in 'Other territories' are included within their closest state.

Mother's Indigenous status

  • Excludes mothers for whom Indigenous status is missing or not stated.
  • Data has been directly age standardised using the June 2001 Australian female estimated resident population aged 15–44 years.

n.a./n.p.

  • n.a. not available
  • n.p. not publishable – data was suppressed due to concerns about confidentiality or low reliability

Hospital sector

  • Includes births that occurred in a hospital only.

Hospital annual number of births

  • Includes births that occurred in a hospital only.

Primary Health Network (PHN) of mother's usual residence

  • PHN of mother's usual residence is presented using the boundaries released by the Department of Health in 2015. Additional information: Primary Health Networks.
  • PHN is derived from Statistical Areas Level 2 (SA2) of mother’s area of usual residence (ABS Australian Statistical Geography Standard Edition 2016).
  • Includes records where mother’s usual residence is an Australian state and/or territory (including 'Other territories').
  • Results for PHN are available from 2012 onwards.

Statistical local area (SA3) of mother's usual residence

  • SA3 of mother's usual residence uses the Australian Bureau of Statistics, Australian Statistical Geography Standard (ASGS): Volume 1 - Main Structure and Greater Capital City Statistical Areas, July 2016, Statistical Area Level 3 (SA3); ABS cat. no. 1270.0.55.001.  Available from: Statistical Area Level 3 (SA3).
  • Between 2012 and 2016, SA3 derived from Statistical Area Level 2 (SA2) of the ABS 2011 Australian Statistical Geography Standard (ASGS) (or Statistical Local Area for jurisdictions for which SA2 was not available). From 2017, SA3 derived from SA2 of the ABS 2016 ASGS. For 2015, data from the ACT were based on the postcode of usual residence.

  • Includes records where mother’s usual residence is an Australian state and/or territory (including 'Other territories').
  • Results for SA3 of mother's usual residence reported using a 3 year aggregate, 2016–2018. The 2016-2018 SA3 calculation has been reported to the ABS 2016 ASGS.  

Mother's age at birth

  • Excludes mothers for whom age is missing or not stated.

Mother's smoking status during pregnancy

  • Excludes mothers for whom smoking status was not stated.
  • The smoking indicator has been calculated differently for this report than in previous reporting of the National Core Maternity Indicators. This methodology provides a more accurate measure and aligns with the methodology used in the Australia’s mothers and babies reports, which also uses data from the National Perinatal Data Collection. Data for all years has been updated to reflect the improved methodology.
  • Smoking in the first 20 weeks of pregnancy for all women giving birth:
    • Calculation of the denominator includes the number of women who gave birth and reported smoking tobacco in the first 20 weeks of pregnancy.
  • Smoking after the first 20 weeks of pregnancy for all women who gave birth and reported smoking during pregnancy:
    • Calculation of the numerator includes women who reported smoking in the first 20 weeks of pregnancy and after the first 20 weeks of pregnancy. Calculation of the denominator includes women who reported smoking in the first 20 weeks of pregnancy.

Whether labour was established

  • Excludes records where onset of established labour is not stated.

Sex of baby

  • Excludes records where sex of baby is not stated or not assigned.

Whether an episiotomy was performed

  • Data reported from 2004 to 2013, a combined laceration and episiotomy value could be recorded; from 2014 onwards, episiotomy could be recorded separately. 
  • Excludes records where it is not stated whether an episiotomy was performed.

Mother's country of birth

  • Excludes records where mother's country of birth is not stated.
  • Data were mapped to the ABS Standard Classification of Countries (SACC), 2016. 

Remoteness of mother's area of residence

  • Remoteness assigned using the ABS Australian Statistical Geography Standard (ASGS) remoteness structure applied to Statistical Areas Level 2 (SA2) of mother’s area of usual residence. 
  • Includes records where mother’s usual residence is an Australian state and/or territory (excluding 'Other territories').
  • Results for remoteness are only available from 2012.

Disadvantage quintile of mother's area of residence

  • Disadvantage quintile assigned using the ABS SEIFA IRSD 2016 scores applied to Statistical Areas Level 2 (SA2) of mother’s area of usual residence.
  • Only includes records where mother’s usual residence is an Australian state and/or territory (excluding 'Other territories').
  • Results for disadvantage quintile are only available from 2012.

Methods

Age-standardised percentages 

Age-standardised percentages enable comparisons to be made between populations that have different age structures. Direct standardisation, in which the age-specific rates are multiplied by a constant population, was used in this report. This effectively removes the influence of the age structure on the summary rate. The report states where age-standardised rates have been used.

All age-standardised rates in this report have used the June 2001 Australian female estimated resident population aged 15–44 years as the standard population.

For more information on methods used to report NPDC data refer to: Australia’s mothers and babies 2018—in brief Appendixes A to D.