AIHW - Maternity Indicators - Instrumental Vaginal Birth for Selected Women Giving Birth for the First Time (%) (PHN) 2012-2016

This dataset presents the footprint of the percentage of selected women giving birth for the first time who gave birth by instrumental vaginal birth, by the mother's usual residence. This has been calculated with the number of selected females giving birth for the first time who gave birth by instrumental vaginal birth, divided by all selected females, and multiplied by 100. The data spans the years of 2012-2016 and is aggregated to 2015 Department of Health Primary Health Network (PHN) areas, based on the 2011 Australian Statistical Geography Standard (ASGS).\n\nWomen included are those who gave birth for the first time and met all of the following criteria:\n\n * Aged between 20 and 34.\n\n * Gestational age at birth between 37 and 41 completed weeks.\n\n * Pregnancy has one baby only (singleton).\n\n * The presentation of the baby is vertex (baby's head was at the cervix).\n\nThe data is sourced from the National Perinatal Data Collection (NPDC), which is a national population-based cross-sectional collection of data on pregnancy and childbirth. The data are based on births reported to the perinatal data collection in each state and territory in Australia. Midwives and other birth attendants, using information obtained from mothers and from hospital or other records, complete notification forms for each birth. A standard de-identified extract is provided to the Australian Institute of Health and Welfare (AIHW) on an annual basis to form the NPDC.\n\nFor further information about this dataset, please visit:\n\n * [Australian Institute of Health and Welfare - National Core Maternity Indicators Data Tables.](https://www.aihw.gov.au/reports/mothers-babies/ncmi-data-visualisations/data)\n\n * [Metadata Online Registry Entry.](https://meteor.aihw.gov.au/content/index.phtml/itemId/690166)\n\nPlease note:\n\n * AURIN has spatially enabled the original data using the [Department of Health - PHN Areas.](https://www1.health.gov.au/internet/main/publishing.nsf/Content/PHN-Home)\n\n * 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.\n\n * Gestational age is a clinical measure of the duration of the pregnancy. For the NPDC gestational age is reported as completed weeks.\n\n * An instrumental birth is a procedure that uses instruments (forceps or vacuum extraction) to assist the baby to come out through the vagina.\n\n * Instrumental vaginal births include forceps and vacuum extraction.\n\n * Data for selected women criteria, parity, were not available from Victoria for 2009.\n\n * Data for Tasmania from 2004 to 2012 were not available. For Tasmania from 2005 to 2012, presentations via caesarean births were not reported by hospitals still using paper-based form. Where a caesarean section occurred the presentation was recorded as ‘Not stated’. Presentations via caesarean births were included in the paper-based form from 1 January 2013. The year 2004 was not included in this analysis.\n\n * The sum of the reported 'Grouped by' values may not equal the Australia total.\n

本数据集呈现了按母亲常住地划分的、首次分娩采用器械阴道助产的初产女性占比情况。其计算方式为：首次分娩且采用器械阴道助产的入选女性人数，除以全部符合入选标准的初产女性总人数，再乘以100。

本数据集覆盖2012至2016年的数据，且基于2011年澳大利亚统计地理标准（Australian Statistical Geography Standard, ASGS），按2015年澳大利亚卫生部基层健康网络（Primary Health Network, PHN）辖区进行聚合。

入选女性需满足以下全部条件：
* 年龄介于20至34岁之间
* 分娩时孕周为37至41整周
* 妊娠为单胎妊娠
* 胎儿胎位为头位（胎儿头部朝向宫颈口）

本数据集源自全国围产期数据采集（National Perinatal Data Collection, NPDC），该项目是一项基于全国人口的妊娠与分娩横断面数据收集工作。数据基于澳大利亚各州及领地上报至围产期数据采集系统的分娩记录。助产士及其他接生人员通过产妇信息、医院或其他医疗记录填写每份分娩的通知表格。每年会将标准化的去标识化数据提取件提交给澳大利亚卫生与福利研究所（Australian Institute of Health and Welfare, AIHW），以此组建全国围产期数据采集库。

如需了解本数据集的更多信息，请访问：
* [澳大利亚卫生与福利研究所——全国核心产科指标数据表](https://www.aihw.gov.au/reports/mothers-babies/ncmi-data-visualisations/data)
* [元数据在线注册条目](https://meteor.aihw.gov.au/content/index.phtml/itemId/690166)

请注意：
* 澳大利亚城市与区域研究基础设施网络（Australian Urban Research Infrastructure Network, AURIN）已对原始数据完成空间适配，采用了[卫生部门基层健康网络辖区](https://www1.health.gov.au/internet/main/publishing.nsf/Content/PHN-Home)的划分标准。
* 分娩被定义为：妊娠至少20周或胎儿体重达到400克及以上时，胎儿经子宫娩出的事件。
* 孕周是衡量妊娠时长的临床指标，在全国围产期数据采集中，孕周以整周数上报。
* 器械助产是指使用器械（产钳或负压吸引）辅助胎儿经阴道娩出的操作。
* 器械阴道助产包括产钳助产与负压吸引助产。
* 2009年维多利亚州未提供符合入选女性标准及产次相关的数据。
* 2004至2012年塔斯马尼亚州未提供相关数据。其中2005至2012年期间，仍使用纸质表单的医院未上报剖宫产分娩的胎位信息，此类剖宫产分娩的胎位被记录为"未说明"。自2013年1月1日起，剖宫产分娩的胎位信息可通过纸质表单上报。本次分析未纳入2004年的数据。
* 按"分组依据"汇总的各项报告数值之和可能不等于澳大利亚全国总计值。