BackgroundInternationally, the Nordic countries occupy top positions in child well-being. We investigated literature on the overall outcomes of young adults from the most vulnerable backgrounds in the Nordic countries, namely young adults who were placed in statutory out-of-home care (OoHC, i.e. foster care) during childhood in the Nordic countries for the protection of their safety and welfare. MethodsWe followed PRISMA guidelines and conducted literature searches manually, as well as electronically, via EBSCO's Psychology/Sociology databases and ProQuest's Social and Behavioral Sciences databases in February 2016 for quantitative studies that compared outcomes at age 18 or later between young adults placed in OoHC as children and those never placed in OoHC. Because of the heterogeneity and small number of eligible studies on each outcome, we conducted no meta-analysis but did formulate a narrative synthesis. ResultsOf 333 studies identified, 20 met the inclusion criteria. All of these studies were cohort studies that employed social and health register data. OoHC placement was studied with nine outcome categories: self-supporting problems, educational challenges, mental health problems, criminality, teenage parenthood, mortality, suicidal behavior, alcohol and drug use, and disability pension. In each of these categories, young adults with a history in OoHC faced higher risks compared with the general population, even after adjusting for various birth parents' socio-economic, demographic, and mental health–related factors. ConclusionAlthough the Nordic countries are among the world's leading nations in promoting child well-being, the Nordic welfare model has partly failed in preventing the inequality of families with children. As young adults, children placed in OoHC in the Nordic countries face an elevated risk of experiencing adversity.