Kent, LisaLee, Siang IngSingh, MeghaWambua, StevenPhillips, KatherineAgrawal, UtkarshAzcoaga-Lorenzo, AmayaMcCowan, ColinKennedy, JonathonHope, HollyMoss, NgawaiPlachcinski, RachelNelson-Piercy, CatherineBlack, MaireadBrophy, SineadMaguire, AideenO’Reilly, DermotNirantharakumar, KrishnarajahEastwood, Kelly-Ann2025-09-082025Kent, L, Lee, S I, Singh, M, Wambua, S, Phillips, K, Agrawal, U, Azcoaga-Lorenzo, A, McCowan, C, Kennedy, J, Hope, H, Moss, N, Plachcinski, R, Nelson-Piercy, C, Black, M, Brophy, S, Maguire, A, O’Reilly, D, Nirantharakumar, K & Eastwood, K-A 2025, 'Prevalence and patterns of pre-existing multimorbidity in pregnancy in Northern Ireland : a population-based, retrospective study using linked routinely collected healthcare data', BMC Pregnancy and Childbirth, vol. 25, 666. https://doi.org/10.1186/s12884-025-07771-11471-2393RIS: urn:4E2CB945173245FE57A0A62CAF3AB204RIS: Kent2025https://hdl.handle.net/2164/25932The authors would like to acknowledge the help provided by the staff of the Honest Broker Service (HBS) within the Business Services Organisation Northern Ireland (BSO). The HBS is funded by the BSO and the Department of Health (DoH). The authors alone are responsible for the interpretation of the data and any views or opinions presented are solely those of the author and do not necessarily represent those of the BSO.192746238engSDG 3 - Good Health and Well-beingAdministrative dataLong-term conditionMaternalMental healthMultimorbidityNorthern IrelandObesityPopulation healthPreconception healthPregnancyRoutinely collected dataUnited KingdomPrevalenceCross-Sectional StudiesHumansMiddle AgedRoutinely Collected Health DataYoung AdultPregnancy Complications/epidemiologyAdolescentAdultFemaleRetrospective StudiesNorthern Ireland/epidemiologyRG Gynecology and obstetricsObstetrics and GynaecologySupplementary DataDASRGJournal article10.1186/s12884-025-07771-1http://www.scopus.com/inward/record.url?scp=105008485924&partnerID=8YFLogxK25