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Using national registries with recorded information, we followed 1,212,201 children for an ADHD diagnosis from 3 to 15\u00a0years. We compared ADHD rates between exposure categories using adjusted hazard ratios (HR) with 95% confidence intervals (CI) from Cox proportional hazards models. We also conducted sibling\u2010controlled analyses among 751,464 full siblings.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>There were 27,665 ADHD diagnoses in the cohort. Compared with term birth (\u226537\u00a0weeks), adjusted HR (95% CI) for ADHD increased with decreasing gestational age: 1.18 (1.11, 1.25), 1.61 (1.37, 1.89) and 2.79 (2.23, 3.49) for 32\u201336\u00a0weeks, 28\u201331\u00a0weeks and 22\u201327\u00a0weeks. Both spontaneous and medically indicated preterm birth were associated with ADHD. SGA was related to 1.62 (1.49, 1.77) times higher ADHD incidence. Preeclampsia, but not placental abruption, was associated with ADHD. Sibling\u2010controlled analyses showed similar results. Preterm birth did not fully explain the associations of SGA or preeclampsia with ADHD.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Preterm birth, SGA and preeclampsia are related to ADHD incidence in offspring.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apa.16375","type":"journal-article","created":{"date-parts":[[2022,4,29]],"date-time":"2022-04-29T08:24:06Z","timestamp":1651220646000},"page":"1546-1555","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Associations of preterm birth, small\u2010for\u2010gestational age, preeclampsia and placental abruption with attention\u2010deficit\/hyperactivity disorder in the offspring: Nationwide cohort and sibling\u2010controlled studies"],"prefix":"10.1111","volume":"111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2940-7467","authenticated-orcid":false,"given":"Rachael 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