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Additionally, we examined the impact of common comorbidities and specific anxiety disorders separately.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Three Finnish registers provided data on a nationwide birth cohort of 22,181 cases with anxiety disorders and 74,726 controls. Conditional logistic regression was used to examine the associations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Extremely very preterm birth and moderate\u2010late preterm birth were associated with increased adjusted odds ratios (aOR) for anxiety disorders (aOR 1.39, 95% CI 1.11\u20131.75 and aOR 1.13, 95% CI 1.03\u20131.23, respectively). Weight for gestational age of less than \u22122SD (aOR 1.29, 95% CI 1.17\u20131.42) and \u22122SD to \u22121SD (aOR 1.08, 95% CI 1.03\u20131.14) were associated with increased odds ratios for anxiety disorders. When comorbidities were considered, the associations became statistically insignificant for pure anxiety disorders, but remained significant in the groups with comorbid depressive or neurodevelopmental disorders.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Preterm birth and poor foetal growth increased the odds for anxiety disorders. However, the associations seem to be explained by the conditions of comorbid depressive and neurodevelopmental disorders. Comorbidities should be considered when examining and treating child and adolescent anxiety disorders.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apa.16377","type":"journal-article","created":{"date-parts":[[2022,4,30]],"date-time":"2022-04-30T07:04:51Z","timestamp":1651302291000},"page":"1556-1565","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Preterm birth, poor foetal growth and anxiety disorders in a Finnish nationwide register sample"],"prefix":"10.1111","volume":"111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0536-3057","authenticated-orcid":false,"given":"Tiia","family":"St\u00e5hlberg","sequence":"first","affiliation":[{"name":"University of Turku  Turku Finland"},{"name":"INVEST Research Flagship Center University of Turku  Turku 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