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dc.contributor.authorBjørngaard, Johan Håkon
dc.contributor.authorBjerkeset, Ottar
dc.contributor.authorVatten, Lars Johan
dc.contributor.authorJanszky, Imre
dc.contributor.authorGunnell, David
dc.contributor.authorRomundstad, Pål Richard
dc.date.accessioned2018-01-09T15:34:23Z
dc.date.available2018-01-09T15:34:23Z
dc.date.created2013-03-14T21:15:07Z
dc.date.issued2013
dc.identifier.citationAmerican Journal of Epidemiology. 2013, 177 (7), 638-644.nb_NO
dc.identifier.issn0002-9262
dc.identifier.urihttp://hdl.handle.net/11250/2476536
dc.description.abstractPrevious studies have reported strong associations between birth order, maternal age, and suicide, but these results might have been confounded by socioeconomic and other factors. To control for such factors, we compared suicide risk between siblings and studied how maternal age at child birth and birth order influenced risk in a cohort study of 1,690,306 Norwegians born in 1967–1996 who were followed up until 2008. Using stratified Cox regression, we compared suicide risk within families with 2 or more children in which one died from suicide. Altogether, 3,005 suicides occurred over a mean follow-up period of 15 years; 2,458 of these suicides occurred among 6,741 siblings within families of 2 or more siblings. Among siblings, a higher position in the birth order was positively associated with risk; each increase in birth order was associated with a 46% (adjusted hazard ratio = 1.46, 95% confidence interval: 1.29, 1.66) higher risk of suicide. For each 10-year increase in maternal age at child birth, the offspring's suicide risk was reduced by 57% (adjusted hazard ratio = 0.43, 95% confidence interval: 0.30, 0.62). Our study suggests that confounding due to familial factors is not likely to explain the associations of birth order and maternal age at child birth with suicide risk.nb_NO
dc.language.isoengnb_NO
dc.publisherOxford University Press (OUP)nb_NO
dc.relation.urihttp://aje.oxfordjournals.org/content/early/2013/03/08/aje.kwt014.abstract
dc.titleMaternal Age at Child Birth, Birth Order, and Suicide at a Young Age: A Sibling Comparisonnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber638-644nb_NO
dc.source.volume177nb_NO
dc.source.journalAmerican Journal of Epidemiologynb_NO
dc.source.issue7nb_NO
dc.identifier.doi10.1093/aje/kwt014
dc.identifier.cristin1019325
dc.description.localcodeThis is a pre-copyedited, author-produced version of an article accepted for publication in [American Journal of Epidemiology] following peer review. The version of record is available online at: https://academic.oup.com/aje/article/177/7/638/91828nb_NO
cristin.unitcode194,65,20,0
cristin.unitcode194,65,35,0
cristin.unitnameInstitutt for samfunnsmedisin og sykepleie
cristin.unitnameInstitutt for psykisk helse
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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