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. 2023 Mar 24;102(5):585–596. doi: 10.1111/aogs.14540

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© 2023 The Authors. Acta Obstetricia et Gynecologica Scandinavica published by John Wiley & Sons Ltd on behalf of Nordic Federation of Societies of Obstetrics and Gynecology (NFOG).

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Participant flow diagram to illustrate the breakdown of recruitment, attrition and sample demographics within the study sample population. Adverse outcomes displayed are not mutually exclusive, see Table 2 for overlap. An admission to the neonatal unit after 37 weeks' gestation was considered “unexpected”. Also, preterm birth was defined as birth before recommended by NICE* guidelines (eg monochorionic monoamniotic 32 weeks' gestation, monochorionic diamniotic 36 weeks' gestation and dichorionic diamniotic 37 weeks' gestation) (NICE: National Institute for Healthcare excellence).