Participants were 307 youth (54% girls; 31% 3rd grade, 35% 6th grade, 34% 9th grade; 67% White; 7% African–American; 7% Latino; 4% Asian; 15% mixed ethnicity) recruited from public schools. The youth came to the laboratory with a parent (85% mothers). After the parent completed an informed consent form and the youth completed an assent form, the youth provided a DNA sample and they both completed a battery of questionnaires.
