Identifying and definitional attributes | |
Metadata item type: | Indicator |
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Indicator type: | Indicator |
Short name: | Percentage of women who gave birth and had at least one antenatal visit in the first trimester, 2010–2011 |
METEOR identifier: | 583479 |
Registration status: | National Health Performance Authority (retired), Retired 01/07/2016 |
Description: | The number of women who gave birth and had at least one antenatal visit in the first trimester, expressed as a percentage of all women who gave birth. An antenatal care visit is an intentional encounter between a pregnant woman and a midwife or doctor to assess and improve maternal and fetal well-being throughout pregnancy and prior to labour. An antenatal care visit does not include a visit where the sole purpose of contact is to confirm the pregnancy only, or those contacts that occurred during the pregnancy that related to other non-pregnancy related issues (see Female—number of antenatal care visits, total N[N]) |
Indicator set: |
Collection and usage attributes | |
Computation description: | First trimester is defined as within the first 13 weeks of pregnancy. Births include both live births and stillbirths of at least 20 weeks gestation or 400 grams birth weight. The percentages of women who gave birth and had at least one antenatal visit in the first trimester are calculated at Medicare Local catchment and Medicare Local peer group levels for:
Analysis by Medicare Local catchment and Medicare Local peer group is based on Statistical Local Area (SLA) of usual residence of the mother, irrespective of where the birth occurred. Women who gave birth at any time during the two calendar years from 1 January 2010 to 31 December 2011 are included. Therefore, women who gave birth more than once during the two-year period are counted for each birth. Women whose gestation at first antenatal visit was unknown or not stated are excluded. Australian non-residents and residents of external territories are excluded. State and territory differences in definitions and methods used for data collection affect the comparability of these data across state and territory jurisdictions and lower levels of geography within these jurisdictions. The following caveats apply to the data for 2010 and 2011:
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Computation: | (Numerator ÷ Denominator) x 100 Reliability of percentages National Perinatal Data Collection (NPDC) data are based on administrative data and therefore are not subject to sampling error. However, when the counts on which percentages have been calculated are small, the percentages may be subject to natural random variation. To quantify the random variation associated with NPDC data, variability bands were calculated using the standard method for calculating 95% confidence intervals for percentages: where P = the percentage of women who gave birth and had at least one antenatal visit in the first trimester; and n = the number of women who gave birth. Suppression of estimates The variability bands were used to calculate the Relative Standard Error (RSE) for each estimate and this information was used as one of the criteria for suppression of estimates. Results were suppressed for confidentiality where the numerator was less than 5 and for reliability where the denominator was less than 100. Additional suppression rules based on the limits for RSE were developed and applied to ensure robust reporting of these data at small areas. For a dichotomous proportion, RSE has been defined as the ratio of the standard error and the minimum of the estimate and its complement (100% - estimate). Data were suppressed where the RSE was 33% or greater or the variability band width was 33% or greater. |
Numerator: | For all women, the number of women who gave birth between 1 January 2010 and 31 December 2011 and had at least one antenatal in the first trimester. For Aboriginal and Torres Strait Islander women, the number of Aboriginal and Torres Strait Islander women who gave birth between 1 January 2010 and 31 December 2011 and had at least one antenatal in the first trimester.
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Numerator data elements: |
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Denominator: | For all women, the number of women who gave birth between 1 January 2010 and 31 December 2011 and had a known gestation at first antenatal visit. For Aboriginal and Torres Strait Islander women, the number of Aboriginal and Torres Strait Islander women who gave birth between 1 January 2010 and 31 December 2011 and had a known gestation at first antenatal visit. |
Denominator data elements: |
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Disaggregation: | The percentages of women who gave birth and had at least one antenatal visit in the first trimester are calculated at Medicare Local catchment and Medicare Local peer group levels for:
For 2007–2011, Indigenous status of mother is derived from Person—Indigenous status, code N. For 2010 and 2011, Medicare Local catchment is derived from Person—area of usual residence, geographical location code (ASGC 2009) NNNNN and Person—area of usual residence, geographical location code (ASGC 2010) NNNNN. Medicare Locals plan and fund health services in communities across Australia. They help to ensure patients can access the care they need, particularly when a variety of health workers are involved in providing treatments. A Medicare Local catchment refers to the geographic area of a Medical Local (see Administrative health region—Medicare Local identifier, code AANNN) Medicare Local peer groups are the grouping of the 61 Medicare Locals into seven peer groups, which allows Medicare Locals to be compared to other Medicare Locals with similar characteristics, and to the average for their peer group (see Administrative health region—Medicare Local peer group, code N). This grouping was undertaken by the National Health Performance Authority using statistical cluster analysis of 2006 Census based socioeconomic status for each Medicare Local and, 2006 Census based Remoteness Area categories (ABS cat. no. 2039.0). Additional information on the average distance to the closest large city and major hospital (A1 public hospital peer group classification, 2010–11) contributed to the assignment of Medicare Locals to peer groups. Groupings were tested for face validity with a stakeholder group. The National Health Performance Authority has created 7 peer groups: Metro 1 to 3, Regional 1 and 2 and Rural 1 and 2. See Healthy Communities: Australians’ experiences with primary health care in 2010–11, Technical Supplement for more information. |
Disaggregation data elements: |
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Comments: | The most recent data currently available from the AIHW National Perinatal Data Collection are for the 2011 calendar year. Information is included in the AIHW National Perinatal Data Collection for all live births and stillbirths of at least 400 grams birthweight or at least 20 weeks gestation in Australia, including births in hospitals, in birth centres and in the community. |
Representational attributes | |
Representation class: | Percentage |
Data type: | Real |
Unit of measure: | Person |
Format: | NN.N |
Indicator conceptual framework | |
Framework and dimensions: | PAF-Effectiveness |
Data source attributes | |
Data sources: | |
Accountability attributes | |
Reporting requirements: | National Health Performance Agreement-Performance and Accountability Framework |
Source and reference attributes | |
Submitting organisation: | National Health Performance Authority |
Origin: | Healthy Communities |
Reference documents: | National Health Performance Authority-Performance and Accountability Framework Healthy Communities: Child and maternal health in 2009–2012, Technical Supplement. Available from: http://www.myhealthycommunities.gov.au/Content/publications/downloads |
Relational attributes | |
Related metadata references: | See also Administrative health region—Medicare Local identifier, code AANNN National Health Performance Authority (retired), Retired 01/07/2016 See also Administrative health region—Medicare Local peer group, code N National Health Performance Authority (retired), Retired 01/07/2016 |