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. 2023 Aug 30;2(1):e000521. doi: 10.1136/bmjmed-2023-000521

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Pooled risk ratio estimates for perinatal adverse outcomes by small-for-gestational-age (<10th centile) births versus average-for-gestational-age (10-90th centile) births with non-customised and customised birthweight centiles (n=2 129 782 births, 1986-2019). Pooled results are from Bradford, England (n=47 583, 2010-19), Denmark (n=384 885, 2004-10), Finland (n=576 758, 2004-14), Norway (n=276 078, 2012-16), and Wales (n=844 478, 1986-2016). Numbers of cases/births for outcomes: stillbirth 2683/2 129 782, neonatal death 795/2 127 697, infant death 1676/2 127 697, low Apgar score at 5 minutes 31 633/1 780 158, NICU admission 1849/47 471. NICU=neonatal intensive care unit; error bars=95% confidence intervals