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Both instability of early rearing environment and severe conduct problems in adolescence may associate with later psychotic disorders. We studied whether the risk of schizophrenia in adulthood is elevated in RS adolescents, and whether it is related to the age at first foster care placement or placement instability.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Adult age schizophrenia spectrum disorder data from RS subjects (N\u2009=\u20091099) were compared to a comparison group matched by age, sex, and place of birth (N\u2009=\u20095437) in a register based follow\u2010up study, with up to 23\u2009years follow\u2010up time. Schizophrenia was also predicted with chosen placement factors. Cox proportional regression model was used in the analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>RS subjects had an 8\u2010fold (HR\u2009=\u20097.82, 95% CI 5.63\u201010.87) risk of schizophrenia compared to the comparison group. RS subjects also had an earlier age of schizophrenia onset. RS cohort, gender, placement instability, or age during the first out\u2010of\u2010home placement did not predict later schizophrenia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Adolescents with severe conduct problems are a specific high\u2010risk group for later schizophrenia. The risk manifests early, which compromises the pathway to the adult well\u2010being. Specialized screening procedures for psychosis risk should be implemented in the standard clinical procedures when working with adolescents with severe behaviour problems, and early intervention programs should be available.<\/jats:p><\/jats:sec>","DOI":"10.1111\/eip.12767","type":"journal-article","created":{"date-parts":[[2018,11,28]],"date-time":"2018-11-28T18:45:13Z","timestamp":1543430713000},"page":"1338-1344","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Severe conduct problems in adolescence and risk of schizophrenia in early adulthood"],"prefix":"10.1111","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1096-1185","authenticated-orcid":false,"given":"Marko","family":"Manninen","sequence":"first","affiliation":[{"name":"National Institute for Health and Welfare Mental Health Unit  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reetta","family":"Latvala","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Helsinki  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minna","family":"Torniainen\u2010Holm","sequence":"additional","affiliation":[{"name":"National Institute for Health and Welfare Mental Health Unit  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaana","family":"Suvisaari","sequence":"additional","affiliation":[{"name":"National Institute for Health and Welfare Mental Health Unit  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maija","family":"Lindgren","sequence":"additional","affiliation":[{"name":"National Institute for Health and Welfare Mental Health Unit  Helsinki Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2018,11,28]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/eip.12020"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/eip.12036"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpr.2008.12.004"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.ajp.2016.15070890"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.3109\/08039488.2014.892151"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1001\/archgenpsychiatry.2010.86"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/eip.12671"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291711001693"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10826-011-9542-4"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2206.2009.00620.x"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.childyouth.2011.11.002"},{"issue":"9","key":"e_1_2_6_13_1","first-page":"1010","article-title":"Mental disorders among adolescents in juvenile detention and correctional facilities","volume":"47","author":"Fazel S.","year":"2008","journal-title":"Journal of the American Academy of Child & Adolescent Psychiatry"},{"key":"e_1_2_6_14_1","first-page":"1","article-title":"Schizophrenia and violence: systematic review and meta\u2010analysis","volume":"6","author":"Fazel S.","year":"2012","journal-title":"PLoS Med"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1192\/bjp.bp.111.096370"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291712003091"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/wps.20250"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1001\/archgenpsychiatry.2011.1592"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1093\/schbul\/sbi015"},{"key":"e_1_2_6_20_1","unstructured":"Hess K. &Gentleman R.(2014).muhaz: Hazard function estimation in survival analysis. 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