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The outcome was death in the first year of life. Mortality risks by birth\u2010weight <jats:italic>z<\/jats:italic> score, defined as a continuous variable using Mar\u0161\u00e1l's EFW and Sankilampi's birth\u2010weight charts, were assessed using generalized additive models by GA (24\u201327<jats:sup>+6<\/jats:sup>, 28\u201331<jats:sup>+6<\/jats:sup>, 32\u201336<jats:sup>+6<\/jats:sup>, 37\u201338<jats:sup>+6<\/jats:sup>, 39\u201341<jats:sup>+6<\/jats:sup>\u2009weeks). We calculated <jats:italic>z<\/jats:italic> score thresholds associated with a two\u2010 and three\u2010fold increased risk of infant death compared with newborns with a birth weight between 0 and 0.675 standard deviations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The <jats:italic>z<\/jats:italic> score thresholds (with corresponding centiles in parentheses) associated with a two\u2010fold increase in infant mortality were: \u22123.43 (&lt;0.1) at 24\u201327<jats:sup>+6<\/jats:sup> weeks, \u22123.46 (&lt;0.1) at 28\u201331<jats:sup>+6<\/jats:sup> weeks, \u22121.29 (9.9) at 32\u201336<jats:sup>+6<\/jats:sup> weeks, \u22121.18 (11.9) at 37\u201338<jats:sup>+6<\/jats:sup> weeks, and\u2009\u2212\u20091.34 (9.0) at 39\u201341<jats:sup>+6<\/jats:sup> weeks according to the EFW chart. These values were\u2009\u2212\u20092.43 (0.8), \u22122.62 (0.4), \u22121.34 (9.0), \u22121.37 (8.5), and \u2212\u20091.43 (7.6) according to the birth\u2010weight chart.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The association between birth weight and infant mortality varies by GA whichever chart is used, suggesting that different thresholds for the screening of growth anomalies could be used across GA to identify high\u2010risk newborns.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ijgo.15772","type":"journal-article","created":{"date-parts":[[2024,7,12]],"date-time":"2024-07-12T08:13:10Z","timestamp":1720771990000},"page":"1138-1145","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Association between risk of infant death and birth\u2010weight <i>z<\/i> scores according to gestational age: A nationwide study using the Finnish Medical Birth Register"],"prefix":"10.1002","volume":"167","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7905-7098","authenticated-orcid":false,"given":"Alice","family":"Hocquette","sequence":"first","affiliation":[{"name":"Universit\u00e9 Paris Cit\u00e9, CRESS, INSERM, INRA  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Pulakka","sequence":"additional","affiliation":[{"name":"Population Health Unit Finnish Institute for Health and Welfare  Helsinki Finland"},{"name":"Research Unit of Population Health, Faculty of Medicine University of Oulu  Oulu Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johanna","family":"Mets\u00e4l\u00e4","sequence":"additional","affiliation":[{"name":"Population Health Unit Finnish Institute for Health and Welfare  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katriina","family":"Heikkil\u00e4","sequence":"additional","affiliation":[{"name":"Population Health Unit Finnish Institute for Health and Welfare  Helsinki Finland"},{"name":"Department of Public Health University of Turku and Turku University Hospital  Turku Finland"},{"name":"Center for Population Health Research University of Turku and Turku University Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer","family":"Zeitlin","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Paris Cit\u00e9, CRESS, INSERM, INRA  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eero","family":"Kajantie","sequence":"additional","affiliation":[{"name":"Population Health Unit Finnish Institute for Health and Welfare  Helsinki Finland"},{"name":"Clinical Medicine Research Unit, MRC Oulu Oulu University Hospital and University of Oulu  Oulu Finland"},{"name":"Department of Clinical and Molecular Medicine Norwegian University of Science and Technology  Trondheim Norway"},{"name":"Children's Hospital Helsinki University Hospital and University of Helsinki  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,7,12]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1097\/00003081-200606000-00006"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(10)62233-7"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199904223401603"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/ijgo.13522"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpeds.2017.12.059"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.15884"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.lanepe.2021.100167"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/uog.17287"},{"key":"e_1_2_9_10_1","unstructured":"Euro\u2010Peristat Research Network.The European Perinatal Health Report 2015\u20132019.2022."},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3476(67)80066-0"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2006.03.069"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1651-2227.2009.01674.x"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/apa.16275"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2000.tb13336.x"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1080\/14767058.2020.1856069"},{"key":"e_1_2_9_17_1","unstructured":"European Registration of Congenital Anomalies (EUROCAT).EUROCAT Guide 1.2. 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