composition with over 70% minority participants (Niv, Tuvblad, Raine, Wang, & Baker, 2012). This project contrasts with the large scale European studies in Finland (Viken, Rose, Kaprio, & Koskenvuo, 1994) and the Netherlands (Rietveld, Hudziak, Bartels, van Beijsterveldt, & Boomsma, 2004) that contain vastly larger sample sizes, but do not report information about racial or ethnic background. Information about age was complete, and information regarding gender composition was relatively complete.
