{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,10]],"date-time":"2025-12-10T12:18:24Z","timestamp":1765369104131},"reference-count":12,"publisher":"Cambridge University Press (CUP)","issue":"3","license":[{"start":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T00:00:00Z","timestamp":1406851200000},"content-version":"unspecified","delay-in-days":8797,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Acta genet. med. gemellol.: twin res."],"published-print":{"date-parts":[[1990,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>A case-control study was conducted to evaluate the association between maternal age and parity and dizygotic (DZ) and monozygotic (MZ) twinning, respectively. Mothers of all twins born alive in Denmark in 1984 or 1985 were included into the study as cases, and a random sample of mothers of singletons were controls. Data on maternal age at delivery and number of previous births were collected from the Danish Medical Birth Register. By means of logistic regression analysis, a significant and positive association was found betwen maternal age and DZ twinning, and a significant and negative association between parity and MZ twinning. No association was found for parity and DZ twinning, nor for maternal age and MZ twinning. The study suggests that human MZ twinning has predictors too, as has DZ twinning. The finding has implications for zygosity classification in future twin research.<\/jats:p>","DOI":"10.1017\/s0001566000005237","type":"journal-article","created":{"date-parts":[[2016,7,27]],"date-time":"2016-07-27T10:00:58Z","timestamp":1469613658000},"page":"329-334","source":"Crossref","is-referenced-by-count":15,"title":["Maternal Age and Parity as Predictors of Human Twinning"],"prefix":"10.1017","volume":"39","author":[{"given":"B.","family":"B\u00f8nnelykke","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2014,8,1]]},"reference":[{"key":"S0001566000005237_ref009","first-page":"253","article-title":"The etiology of human dizygotic twinning with special reference to spontaneous abortions","volume":"28","author":"H\u00e9mon","year":"1979","journal-title":"Acta Genet Med Gemellol"},{"key":"S0001566000005237_ref007","first-page":"385","article-title":"Twinning in relation to the marital status of the mother","volume":"17","author":"Eriksson","year":"1967","journal-title":"Acta Genet Stat Med"},{"key":"S0001566000005237_ref001","first-page":"89","volume-title":"Twin Research. 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Part A: Twin Biology and Multiple Pregnancy","author":"Lazar","year":"1981"},{"key":"S0001566000005237_ref005","volume-title":"Twin births and twins from a heriditary point of view","author":"Dahlberg","year":"1926"},{"key":"S0001566000005237_ref002","volume-title":"Discrete multivariate analysis: Theory and practice","author":"Bishop","year":"1975"}],"container-title":["Acta geneticae medicae et gemellologiae: twin research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0001566000005237","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,5,18]],"date-time":"2019-05-18T20:48:42Z","timestamp":1558212522000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0001566000005237\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1990,7]]},"references-count":12,"journal-issue":{"issue":"3","published-print":{"date-parts":[[1990,7]]}},"alternative-id":["S0001566000005237"],"URL":"https:\/\/doi.org\/10.1017\/s0001566000005237","relation":{},"ISSN":["0001-5660","2059-6324"],"issn-type":[{"value":"0001-5660","type":"print"},{"value":"2059-6324","type":"electronic"}],"subject":[],"published":{"date-parts":[[1990,7]]}}}