National Indigenous Reform Agreement: PI 09Antenatal care, 2019
Indicator Attributes
Identifying and definitional attributes  
Metadata item type:  Indicator 

Indicator type:  Indicator 
Short name:  PI 09Antenatal care, 2019 
METEOR identifier:  699458 
Registration status:  Indigenous, Superseded 23/08/2019 
Description:  There are two measures for this indicator, both to be reported by Indigenous status: (a) Number of females who gave birth, where an antenatal visit was reported in the first trimester, as a proportion of females who gave birth. (b) Number of females who gave birth, where five or more antenatal visits were reported, as a proportion of females who gave birth. 
Rationale:  The primary care needs of all Australians are met effectively through timely and quality care in the community. Good antenatal care is associated with positive health outcomes for mothers and babies. 
Indicator set:  National Indigenous Reform Agreement (2019) Indigenous, Superseded 23/08/2019 
Outcome area:  Indigenous children are born and remain healthy Indigenous, Standard 21/07/2010 
Data quality statement:  National Indigenous Reform Agreement: PI 09Antenatal care, 2019; Quality Statement Indigenous, Standard 07/02/2019 
Collection and usage attributes  
Computation description:  First trimester is defined as up to and including 13 weeks of pregnancy. Analysis by state/territory and remoteness is based on the usual residence of the mother. Data exclude Australian nonresidents, residents of external territories and records where state/territory of residence was not stated. Crude rates are calculated for Indigenous Australians. Agestandardised rates are calculated for Indigenous and nonIndigenous Australians. Rate ratios and rate differences are calculated for comparisons between Indigenous and nonIndigenous Australians (using agestandardised rates). For variability bands: Variability bands are to be calculated for rates using the standard method (see definition below). For trends: Percentage change and statistical significance of change is to be calculated (required for reporting of progress over time). Presentation: Number, percentage, rate per 100 females who gave birth, rate ratios, rate differences and variability bands. Definitions: Standard method for variability band computation: Rates derived from administrative data counts are not subject to sampling error but may still be subject to natural random variation, especially for small counts. A 95% confidence interval (CI) for an estimate is a range of values which is very likely (95 times out of 100) to contain the true unknown value. Where the 95% CIs of two estimates do not overlap it can be concluded that there is a statistically significant difference between the two estimates. This is the standard method used in Australian Institute of Health and Welfare (AIHW) publications for which formulas can be sourced from Breslow and Day (1987) in the publication Statistical methods in cancer research. Typically in the standard method, the observed rate is assumed to have natural variability in the numerator count (for example, deaths, hospital visits) but not in the population denominator count. Also, the rate is assumed to have been generated from a normal distribution ('Bell curve'). Random variation in the numerator count is assumed to be centred around the true value; that is, there is no systematic bias. 

Computation:  Crude rate: 100 x (Numerator ÷ Denominator). Agestandardised rate: calculated using the direct method, using fiveyear age groups from 15–19 to 40–44 with the 30 June 2001 Australian female estimated resident population (ERP) based on the 2001 Census as the standard population. Agestandardisation should be done in accordance with the National Indigenous Reform Agreement Performance Information Management Group (NIRAPIMG) agreed principles for direct agestandardisation (see Comments section. Note that Principle 4 is not applicable for this indicator). Rate ratio: Indigenous agestandardised rate divided by nonIndigenous agestandardised rate. Rate difference: Indigenous agestandardised rate minus nonIndigenous agestandardised rate. Variability band: to be calculated using the standard method for estimating 95% confidence intervals as follows: Crude rate: Where CI = confidence interval for either Measure a or Measure b CR = crude rate for either Measure a or Measure b n = crude rate denominator for either Measure a or Measure b. Agestandardised rate: Where CI = confidence interval for either Measure a or Measure b ASR = agestandardised rate for either Measure a or Measure b w_{i} = the proportion of the standard population in age group i d_{i} = the numerator for either Measure a or Measure b in age group i n_{i} = the denominator for either Measure a or Measure b respectively (see Denominator below) in the population in age group i. Percentage change: Calculated by multiplying the average annual change over the period by the number of data points less 1. This is then divided by the rate for the first year in the series and multiplied by 100. The average annual change in rates, rate ratios and rate differences are calculated using linear regression which uses the least squares method to calculate a straight line that best fits the data and returns an array that best describes the line. The simple linear regression line, Y = a + bX, ‘slope’ estimate (b) was used to determine the average annual change in the data over the period. The formula used to calculate the slope estimate and standard error of the slope in Microsoft Excel is: LINEST (known_y’s, known_x’s, true) entered as an array formula (Ctrl, Shift, Enter). Statistical significance of change: The 95% CIs for the standard error of the slope estimate (average annual change) are used to determine whether the apparent increases or decreases in the data are statistically significant at the p<0.05 level. The formula used to calculate the CIs for the standard error of the slope estimate is: 95% CI(x) = x ± 1.96 x SE(x) where x is the average annual change (slope estimate). If the upper and lower 95% CIs do not include zero, then it can be concluded that there is statistical evidence of an increasing or decreasing trend in the data over the study period.

Numerator:  Measure (a): Number of females who gave birth to at least 1 live or stillborn baby, where an antenatal visit was reported in the first trimester (up to and including 13 completed weeks). Measure (b): Number of females who gave birth to at least 1 live or stillborn baby, where 5 or more antenatal visits were reported for pregnancy of 32 or more weeks gestation. 
Numerator data elements:  
Denominator:  Measure (a) Total number of females who gave birth to at least one live or stillborn baby (where gestation at first antenatal visit is known). Measure (b) Total number of females who gave birth at 32 weeks or more gestation to at least one live or stillborn baby (where number of antenatal visits is known). 
Denominator data elements:  
Disaggregation:  Current period—(2016): For Indigenous females only (number and crude rate):
Time series—2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 (the data for these years have been previously supplied), 2016 (required for 2019 reporting): For Indigenous and nonIndigenous females (number, agestandardised rate, rate ratio, rate difference and variability bands):
Data for 2016 to be calculated separately to include and exclude Victoria, to enable continuity of the time series. 
Disaggregation data elements:  
Comments:  Most recent data available for the 2019 National Indigenous Reform Agreement (NIRA) Report (2017–18 reporting cycle) is 2016. The National Perinatal Data Collection (NPDC) consists of an agreed set of standardised data items as specified in the Perinatal National Minimum Data Set (NMDS), as well as additional (nonstandardised) data items. There were no data elements in the Perinatal NMDS for antenatal care prior to July 2010. A standard data item for gestation at first presentation for antenatal care was developed and included in the Perinatal NMDS from 1 July 2010, while a standard data item for number of antenatal visits was developed and included in the Perinatal NMDS from 1 July 2013. Data on gestation at first antenatal visit (for Measure (a) are only available to report for New South Wales, Victoria, Queensland, the Australian Capital Territory and the Northern Territory for births from January 2010, and for Victoria and Tasmania for births from 1 July 2010. Maternal age is the age at the time of giving birth. NIRAPIMG agreed Principles for reporting directly agestandardised rates for administrative data. 
Representational attributes  
Representation class:  Percentage 
Data type:  Real 
Unit of measure:  Person 
Format:  NN[N].N 
Indicator conceptual framework  
Framework and dimensions:  Effective/Appropriate/Efficient 
Data source attributes  
Data sources:  
Accountability attributes  
Reporting requirements:  National Indigenous Reform Agreement. 
Organisation responsible for providing data:  Australian Institute of Health and Welfare. 
Source and reference attributes  
Submitting organisation:  Australian Institute of Health and Welfare 
Steward:  National Indigenous Reform Agreement Performance Information Management Group 
Reference documents:  Breslow NE & Day NE (eds) 1987. Statistical methods in cancer research. Volume II: The design and analysis of cohort studies. IARC Scientific Publications No. 82. Lyon, France: International Agency for Research on Cancer. Viewed 20 June 2017, http://www.iarc.fr/en/publications/pdfsonline/stat/sp82/ 
Relational attributes  
Related metadata references:  Supersedes National Indigenous Reform Agreement: PI 09Antenatal care, 2018 Indigenous, Superseded 31/07/2018 Has been superseded by National Indigenous Reform Agreement: PI 09Antenatal care, 2020 Indigenous, Standard 23/08/2019 