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Perinatal mortality and admission to the neonatal intensive care unit (<jats:styled-content style=\"fixed-case\">NICU<\/jats:styled-content>) of both <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> neonates, intrauterine fetal demise (<jats:styled-content style=\"fixed-case\">IUFD<\/jats:styled-content>) and neonatal mortality of <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> neonates, and neonatal shoulder dystocia and hypoglycemia as well as maternal third\u2010 and fourth\u2010degree perineal lacerations in LGA pregnancies were evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The electronic search identified 237 records that were examined based on title and abstract, of which 27 full\u2010text articles were examined for eligibility. After excluding seven articles, 20 observational studies were included in a Bayesian meta\u2010analysis. Neonates classified as <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> according to customized growth charts had higher risks of <jats:styled-content style=\"fixed-case\">IUFD<\/jats:styled-content> (odds ratio (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>), 7.8 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 4.2\u201312.3)), neonatal death (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 3.5 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 1.1\u20138.0)), perinatal death (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 5.8 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 3.8\u20137.8)) and <jats:styled-content style=\"fixed-case\">NICU<\/jats:styled-content> admission (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 3.6 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 2.0\u20135.5)) than did non\u2010<jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> cases. Neonates classified as <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> according to population\u2010based growth charts also had increased risk for adverse outcomes, albeit the point estimates of the pooled <jats:styled-content style=\"fixed-case\">ORs<\/jats:styled-content> were smaller: <jats:styled-content style=\"fixed-case\">IUFD<\/jats:styled-content> (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 3.3 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 1.9\u20135.0)), neonatal death (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 2.9 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 1.2\u20134.5)), perinatal death (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 4.0 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 2.8\u20135.1)) and <jats:styled-content style=\"fixed-case\">NICU<\/jats:styled-content> admission (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 2.4 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 1.7\u20133.2)). For <jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> <jats:italic>vs<\/jats:italic> non\u2010<jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content>, there were no differences in pooled <jats:styled-content style=\"fixed-case\">ORs<\/jats:styled-content> for perinatal death, <jats:styled-content style=\"fixed-case\">NICU<\/jats:styled-content> admission, hypoglycemia and maternal third\u2010 and fourth\u2010degree perineal lacerations when classified according to either the customized or the population\u2010based approach. In contrast, both approaches indicated that <jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> neonates are at increased risk for shoulder dystocia than are non\u2010<jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> ones (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 7.4 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 4.9\u20139.8) using customized charts; <jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>, 8.0 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>, 5.3\u201310.1) using population\u2010based charts).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Both customized and population\u2010based growth charts can identify <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content> neonates at risk for adverse outcomes. Although the point estimates of the pooled <jats:styled-content style=\"fixed-case\">ORs<\/jats:styled-content> may differ for some outcomes, the overlapping <jats:styled-content style=\"fixed-case\">CIs<\/jats:styled-content> and lack of direct comparisons prevent conclusions from being drawn on the superiority of one method. Future clinical trials should compare directly the two approaches in the management of fetuses of abnormal size. Copyright \u00a9 2016 ISUOG. 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