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, 2018

690054

Antenatal Indicators

 

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

690056

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

690069

Labour and birth Indicators

 

Selected Women

 

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

690112

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

690119

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

690125

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

690166

All Women

 

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

690076

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

690168

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

690174

Birth outcome indicators

 

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

690106

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

690170

PI 13–Third and fourth degree tears for vaginal births

690172

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 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. 

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 2011) for all states and territories, except in the ACT from 2012-2015 and the NT in 2012, where mothers postcode of usual residence was used. 
  • 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 2011, Statistical Area Level 3 (SA3); ABS cat. no. 1270.0.55.001.  Available from: Statistical Area Level 3 (SA3).
  • SA3 is derived from Statistical Areas Level 2 (SA2) of mother’s area of usual residence for all states and territories where available, when SA2 is not stated the Statistical local area (SLA) of the mother’s residence is used, and in the ACT from 2012-2015 and the NT in 2012, mothers postcode of usual residence was used.
  • 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, 2014–2016.

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.

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), 2011. 

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 2011 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 see: Australia’s mothers and babies 2016—in brief Appendixes A to D.