47 Defining vulnerability subgroups among pregnant women APPENDIX 1. Description of data sources, variables and outcomes included Data sources The Dutch Perinatal Registry Perined collects routine care data on pregnancy after 22 weeks of gestation, birth and the first 28 days after birth, as supplied by midwives, gynaecologists and paediatricians.1 Perined includes data on type of care used and health outcomes of mother and child. From 2000 onwards, Perined contains data on 96 – 99% of all births. Healthcare information centre Vektis collects claims data under the Dutch Healthcare Insurance Act and provides data on healthcare utilization and spending.2 Data on 99% of the Dutch (insured) population is available. DIAPER contains detailed claims data of Vektis as available from 2015. Statistics Netherlands collects and publishes data on societal matters and provides access to data through their System of Social Statistical Datasets (SSD).3,4 This linkable SSD-data covers nearly 20 themes, including health, welfare, income, education and labour. Data originate from various (governmental) organisations, including municipalities and the National Tax Authority. We enriched DIAPER with self-reported data on health, well-being and lifestyle of the Public Health Monitor 2016 (PHM-2016). This is a health survey among a varying sample of the Dutch population aged 19 years and older, carried out every four years by the Community Health Services (GGD), Statistics Netherlands and the National Institute for Public Health and the Environment. The PHM-2016 had 457.153 participants and was mainly conducted from September-December 2016. 1 Perined. Over Perined [about Perined] n.d. Available from: https://www.perined.nl/over-perined. 2 de Boo A. Vektis ‘Informatiecentrum voor de zorg’ [Vektis ‘Information center for healthcare’]. Tijdschrift voor gezondheidswetenschappen. 2011;89(7):358-9 3 Bakker BF, Van Rooijen J, Van Toor L. The system of social statistical datasets of Statistics Netherlands: An integral approach to the production of register-based social statistics. Statistical Journal of the IAOS. 2014;30(4):411-24. 4 Statistics Netherlands (CBS). About CBS. n.d. Available from: https://www.cbs.nl/en-gb/about-us/. 2
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