AIHW - Maternity Indicators - Non-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 non-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 non-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/690125)\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 * A non-instrumental vaginal birth is one in which the baby is born through the vagina without the assistance of instruments (vacuum or forceps).\n\n * Non-instrumental vaginal births include spontaneous vaginal and vaginal breech.\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

本数据集按母亲常住地呈现了特定首次生育女性中非器械辅助阴道分娩者所占百分比的分布情况。该百分比的计算方式为：特定首次生育且通过非器械辅助阴道分娩的女性人数除以所有特定女性人数，再乘以100。数据跨度为2012-2016年，并基于2011年澳大利亚统计地理标准（Australian Statistical Geography Standard，ASGS）聚合至2015年卫生部初级卫生网络（Primary Health Network，PHN）区域。

入选女性需满足以下所有条件：

* 年龄介于20至34岁之间。

* 分娩孕周为37至41周完整孕周。

* 单胎妊娠。

* 胎儿为头位（vertex，即胎儿头部位于宫颈处）。

数据来源于国家围产期数据收集系统（National Perinatal Data Collection，NPDC），该系统是全国性、基于人群的妊娠与分娩数据横断面收集系统。数据基于澳大利亚各州及领地向围产期数据收集系统上报的分娩记录，由助产士及其他分娩护理人员通过母亲提供的信息及医院或其他记录填写通知表格。每年向澳大利亚卫生福利研究所（Australian Institute of Health and Welfare，AIHW）提交标准化匿名数据提取物，以构成NPDC。

如需了解本数据集的更多信息，请访问：

* [澳大利亚卫生福利研究所 - 国家核心孕产指标数据表](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/690125)

请注意：

* AURIN已利用[卫生部 - PHN区域](https://www1.health.gov.au/internet/main/publishing.nsf/Content/PHN-Home)对原始数据进行空间化处理。

* 分娩定义为：妊娠至少20周或胎儿体重达400克及以上时，胎儿从子宫娩出的事件。

* 非器械辅助阴道分娩指胎儿通过阴道娩出且无需器械（真空吸引或产钳）辅助的分娩方式。

* 非器械辅助阴道分娩包括自然阴道分娩和阴道臀位分娩。

* 维多利亚州2009年缺乏特定女性标准中关于产次（parity）的数据。

* 塔斯马尼亚州2004-2012年的数据不可用。2005-2012年期间，仍使用纸质表格的医院未报告剖宫产的胎位情况；发生剖宫产时，胎位记录为“未说明”。2013年1月1日起，纸质表格开始纳入剖宫产胎位记录。本分析未包含2004年数据。

* 各“分组依据”值的总和可能不等于澳大利亚全国总数。