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We aimed to investigate the associations between childhood leukemia and perinatal characteristics including birth order, birth interval to older siblings, parental age, birth weight, and multiple birth.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>We identified cases diagnosed between 1981 and 2015 and born in Switzerland between 1969 and 2015 from the Swiss Childhood Cancer Registry and randomly sampled five controls per case from national birth records matched on date of birth, sex, and municipality of residence at birth. We used conditional logistic regression to investigate associations between perinatal characteristics and leukemia at ages 0\u201315 and 0\u20134\u00a0years, and the subtypes acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The study included 1,403 cases of leukemia. We observed increased risks associated with high birth weight (adjusted OR 1.37, 95% CI 1.12\u20131.69) and multiple birth (1.89, 1.24\u20132.86). These associations were similar for ALL and stronger for leukemia at ages 0\u20134\u00a0years. For AML, we observed an increased risk for higher birth order (3.08, 0.43\u201322.03 for fourth or later born children). We found no associations with other perinatal characteristics.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>This register-based case\u2013control study adds to the existing evidence of a positive association between high birth weight and risk of childhood leukemia. Furthermore, it suggests children from multiple births are at an increased risk of leukemia.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s10552-021-01423-3","type":"journal-article","created":{"date-parts":[[2021,4,20]],"date-time":"2021-04-20T18:34:51Z","timestamp":1618943691000},"page":"713-723","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Birth characteristics and childhood leukemia in Switzerland: a register-based case\u2013control study"],"prefix":"10.1007","volume":"32","author":[{"given":"Judith E.","family":"Lupatsch","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5273-1954","authenticated-orcid":false,"given":"Christian","family":"Kreis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7493-9334","authenticated-orcid":false,"given":"Garyfallos","family":"Konstantinoudis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9649-6498","authenticated-orcid":false,"given":"Marc","family":"Ansari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8957-2002","authenticated-orcid":false,"given":"Claudia E.","family":"Kuehni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1430-5695","authenticated-orcid":false,"given":"Ben D.","family":"Spycher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,4,20]]},"reference":[{"key":"1423_CR1","doi-asserted-by":"publisher","first-page":"471","DOI":"10.1038\/s41568-018-0015-6","volume":"18","author":"M Greaves","year":"2018","unstructured":"Greaves M (2018) A causal mechanism for childhood acute lymphoblastic leukaemia. 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