Birth Data Linkage Project - Stage 2
This page describes the second stage of the City University Birth Data Linkage Project.
Stage 2: Linkage of birth registration data and NHS Numbers for Babies (NN4B) dataset with HES data (England) and PEDW data (Wales)
Dattani N, Datta-Nemdharry P, Macfarlane A (2011). Linking maternity data for England, 2005-06: methods and data quality. Health Statistics Quarterly 2011; 49: 53-76. http://www.ons.gov.uk/ons/rel/hsq/health-statistics-quarterly/spring-2011/linking-maternity-data-for-england--2005-06--methods-and-data-quality.pdf
- To extend the range of data available for England, the linked birth registration and NN4B dataset created in the first phase was further linked to Maternity HES for the years 2005 and 2006 This article describes linkage to Maternity HES records and reports on its data quality and completeness.
- This study showed that it is possible to link the majority (90 per cent) of Maternity HES records to registration and NN4B linked records, although the method of linkage needed to be amended for future use. Birth registration and NN4B are more reliable sources of data than Maternity HES but where data have been recorded in Maternity HES they are in good concordance with birth registration or NN4B. However there were a large proportion of records where information was not recorded on Maternity HES. For linkage to be of better use, data quality and completeness needs to improve in Maternity HES.
Dattani N, Datta-Nemdharry P, Macfarlane A (2012) Linking maternity data for England, 2007: methods and data quality. Health Statistics Quarterly 2012; 53 : 4-21. http://www.ons.gov.uk/ons/rel/hsq/health-statistics-quarterly/no--53--spring-2012/maternity-data-article-download.pdf.
Reference tables http://www.ons.gov.uk/ons/publications/re-reference-tables.html?edition=tcm%3A77-244764
- Following linkage of the 2007 birth registration data and NN4B dataset, the resulting dataset was linked to the 2007 Maternity HES dataset for England. Similar issues arose as for 2005 and 2006, resulting in a call for further improvements in the quality and completeness of Maternity HES.
Datta-Nemdharry P, Dattani N, Macfarlane A, Thomas G (2012) Linking maternity data for Wales 2005-07: methods and data quality., Health Statistics Quarterly 2012; Summer(54):1-24. http://www.ons.gov.uk/ons/rel/hsq/health-analysis/linking-maternity-data-for-wales--2005-07--methods-and-data-quality/maternity-data-for-wales-article-download.pdf
- This article described linkage of the linked birth registration and NN4B dataset to PEDW and NCCHD for the years 2005 to 2007, to extend the range of data available for Wales. It also assessed the quality and completeness of the linked data.
- The linkage rate for maternity data in Wales was similar to that obtained in linking registration/NN4B linked data to the Maternity HES records for England but the data were of higher quality and were more complete. NCCHD linked to PEDW could be used to analyse birth outcomes for Wales without the need to link to birth registration and NN4B data. However as data items such as motherís country of birth and socio-economic status are recorded only at birth registration, linkage to the birth registration/NN4B dataset can generate a much fuller set of data items and enable analyses of birth outcomes by factors such as ethnicity, socio-economic status and parentsí country of birth.
Datta-Nemdharry P, Dattani N, Macfarlane AJ. Birth outcomes for African and Caribbean babies in England and Wales: retrospective analysis of routinely collected data. BMJ Open 2012;2:e001088. http://bmjopen.bmj.com/content/2/3/e001088.full.pdf
- This study analysed birth weight and gestational age for 1) babies of African ethnicity born in England and Wales to mothers born in Africa, looking for differences between groups of African countries 2) babies of African ethnicity born to mothers born themselves in the UK, or born in Caribbean or African countries.
- There were differences between birth weights and gestational ages for babies of women born in Africa or the Caribbean compared with babies of women of the same ethnicities born in the UK.
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