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Logistic regression models were used to estimate odds ratios (OR) and 95% confidence intervals (CI) following exposure to perinatal and parental factors.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>We identified 1645 cases (61% male) and 15\u2009463 matched controls. The median age of KD diagnoses was 2.6\u2009years. Preterm birth was significantly associated with increased odds of developing KD (OR 1.24, 95% CI 1.01\u20131.53), particularly for children diagnosed before 1 year of age (OR 1.82, 95% CI 1.15\u20132.86). Prenatal maternal smoking was also associated with diagnoses before 1 year of age and the risk was increased in males if their mothers were 35\u2009years of age or older at the time of delivery. The risk was higher among children of Asian or African descent. Perinatal factors had a higher impact on the risk of KD in children with Asian parents.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Prematurity was significantly associated with an increased risk of developing KD. Other risks were prenatal maternal smoking, advanced maternal age, and being of Asian or African descent.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/apa.70071","type":"journal-article","created":{"date-parts":[[2025,3,30]],"date-time":"2025-03-30T14:26:41Z","timestamp":1743344801000},"page":"1990-1999","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Swedish Nationwide Study Found That Prematurity Was Associated With Kawasaki Disease"],"prefix":"10.1111","volume":"114","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7708-4139","authenticated-orcid":false,"given":"Anna","family":"Frisk","sequence":"first","affiliation":[{"name":"Division of Rheumatology, Department of Medicine Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3311-8224","authenticated-orcid":false,"given":"Andr\u00e9","family":"Rudolph","sequence":"additional","affiliation":[{"name":"Division of Rheumatology, Department of Medicine Karolinska Institutet  Stockholm Sweden"},{"name":"Department of Pediatric Cardiology Stockholm\u2010Uppsala Karolinska University Hospital  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1565-8385","authenticated-orcid":false,"given":"H\u00e5kan","family":"Eliasson","sequence":"additional","affiliation":[{"name":"Department of Pediatric Cardiology Stockholm\u2010Uppsala Karolinska University Hospital  Stockholm Sweden"},{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7549-690X","authenticated-orcid":false,"given":"Felicia","family":"Nordenstam","sequence":"additional","affiliation":[{"name":"Department of Pediatric Cardiology Stockholm\u2010Uppsala Karolinska University Hospital  Stockholm Sweden"},{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1619-0171","authenticated-orcid":false,"given":"Gunnar","family":"Bergman","sequence":"additional","affiliation":[{"name":"Department of Pediatric Cardiology Stockholm\u2010Uppsala Karolinska University Hospital  Stockholm Sweden"},{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0915-7245","authenticated-orcid":false,"given":"Marie","family":"Wahren\u2010Herlenius","sequence":"additional","affiliation":[{"name":"Division of Rheumatology, Department of Medicine Karolinska Institutet  Stockholm Sweden"},{"name":"Department of Clinical Science, Broegelmann Research Laboratory University of Bergen  Bergen Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1873-7169","authenticated-orcid":false,"given":"Johannes","family":"Mofors","sequence":"additional","affiliation":[{"name":"Division of Rheumatology, Department of Medicine Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,3,28]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1161\/CIR.0000000000000484"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/ped.13809"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.84.4.666"},{"key":"e_1_2_11_5_1","first-page":"194","article-title":"Racial\/Ethnic Differences in the Incidence of Kawasaki Syndrome Among Children in Hawai'i","volume":"69","author":"Holman R. 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