Participant enrollment was completed during April 2006, and data collection through child age 27 months was completed in June 2008. As of the writing of this report, assessments through age 60 months are underway, and the 72- and 84-month assessments have not yet begun. As is described below, the analyses to date focus on sample representativeness, openness and selective placement in the adoption, and a preliminary investigation of G×E interactions.
