Nick, here is the link to the NPR story about the study....I don't see the study itself on the web. The focus seems to be on "self-esteem." I don't think it gets into the real specific parameters of the study itself.
Study: Adoption Not Harmful to Child's Self-Esteem : NPR
Of course, I have recently seen a study that suggest "bleak" things for all adoptees (not just those in TRA)...higher rates of counseling, diagnoses of ADHD, etc. Tough to see.