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This file contains data on hospitalisations in Dutch hospitals of persons registered in the Basic Registration Persons (BRP). The data comes from the National Basic Registration of Hospital Care (LBZ) of Dutch Hospital Data (DHD). More information on how to access the data: > https://www.cbs.nl/nl-nl/onze-diensten/maatwerk-en-microdata/microdata-zelf-onderzoek-doen ### Methodology Hospitalisations are linked to the Basic Registration Persons (BRP) based on Citizen Service Number (BSN) pseudonyms and for a small part based on the combination of date of birth, gender and postcode. The return (after verification and correction) of the BRP coupling of LBZ shots is 97.3 % in 2013, 99.1 % in 2014, 99.5 % in 2015/2016, 99.6 % in 2017, 99.7 % in 2018/2019, 99.8 % in 2020 and 99.9 % in 2021. This file displays only the LBZ records associated with the BRP. As a person ID, the variable RINPERSOON is added, a meaningless and dimensionless number, which can be used to link to other CBS SSB files. A height weight has been included with which the (linked to the BRP) shots can be increased to all shots. The variables involved in the weighting are gender, care type of hospital admission, admission specialism and the patient’s municipal code. The LBZ files are there since 2013. For the 1995-2012 registration years, there are files of hospitalisations based on the LMR, the predecessor of the LBZ. In the linked LMR files (LMRBASISJJJJJ) the images missing in the LMR are not included. As of 2013, microrecords for the previously missing recordings are delivered to the LBZ by the hospitals. These incomplete records contain some data about the admission and the patient, but for example no diagnoses. In 2013 and 2014, some hospitals had failed to deliver these incomplete records to the LBZ. For these recordings, CBS requested some recording data from the hospitals, so that they could largely be linked to the BRP and could be added to LBZBASISJJJJ as incomplete records. Thus, in LBZBASISJJJY, almost all recordings are present, of which only some of the records lack the main diagnosis and main operation and some other variables in a small part of the records. This 'incomplete records ' in LBZBASISYYY, 23.3 % of hospital admissions linked to the BRP in 2013, 12.5 % in 2014, 6.3 % in 2015, 7.7 % in 2016, 10.7 % in 2017, 10.5 % in 2018, 13.8 % in 2019, 12.7 % in 2020 and 15.4 % in 2021. In clinical shots, 14.9 % was incomplete in 2013, 3.0 % in 2014, 0.3 % in 2015 and 0 % in 2016 and later years. For daily admissions, 30.2 % was incomplete in 2013, 22.6 % in 2014, 13.7 % in 2015, 17.3 % in 2016, 23.4 % in 2017, 22.9 % in 2018, 29.1 % in 2019, 27.1 % in 2020 and 32.1 % in 2021. At the 'long-term observations without overnight stay ' 0.4 % is incomplete in 2015 and 0 % in 2016 and later years. CBS has imputated the missing information in these incomplete records by taking this information from a fully recorded record that resembles the incomplete record as much as possible. In the imputation procedure, a complete record is sought with equal recording specialism, care type and gender, with a & distance function ' a most similar record is chosen, using the variables age, death in hospital, migration background from BRP, type of hospital, duration of admission and urgency of admission. The imputed values are displayed in the file in the variables with the suffix &imp ' in the name and are thus distinguishable from the actual recorded variables. Please note that the imputated variables are not suitable for use in (longitudinal) examination of recordings of individuals; these are not real data. For cross-sectional research at sufficiently aggregated level, these imputed variables can be used. It should be noted that the quality of the diagnosis at the complete daily admissions is not always high, e.g. because some hospitals have derived the main diagnoses from the typical diagnosis recorded for the entire treatment (diagnosis combination, DBC care product). ### Population Hospitalisations that have taken place in all general and academic Dutch hospitals. In addition, hospitalisations within three categorical hospitals (two kankerk clinic and an eye hospital) have been admitted. These data on hospital admissions are from the National Basic Registration of Hospital Care (LBZ). In the file are both day shots, clinical shots and from 2015 also & long-term observations without overnight stay ' registered. Outpatient contacts are not included in this file. Data on admission and dismissal are included in LBZBASISJYY, the main diagnosis and (if applicable) the main operation carried out. All diagnoses recorded during the recording (including side diagnoses) are included in the file LBZDIAGNOSENJJJ. Only hospitalisations linked to the BRP are included in LBZBASISJYYY (see 'Used methodology ' for more details).

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Hospital admissions National Register of Basic Hospital Care (01-01-2019 - 01-01-2022)

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