A great deal of research has examined the etiology of attention-deficit/hyperactivity disorder (ADHD) and ADHD symptomatologies. Genetic factors are consistently shown to explain a significant proportion of variance in measures of ADHD. The current study adds to this body of research by examining whether genetic liabilities for criminality and…

This study examined the contribution of demographic characteristics, early maltreatment, and peer and family relationships during adolescence to the prediction of aggressive and nonaggressive antisocial behavior (AASB and NAASB, respectively) during young adulthood; and determined whether adoption status has additional ability to predict ASB, once…

Used National Longitudinal Study of Adolescent Health data to compare adolescent adjustment problems in two-parent adoptive families, two-parent biologic families, and step- or single-parent biologic families. Found that adjustment difficulties were far more common among adolescents in step- and single-parent families than in other groups.…

The current study investigated group differences in adolescent adjustment by adoption status and adoption subtype in a national sample, in contrast to group differences based on developmental stage or gender. Secondary analyses of the National Longitudinal Study of Adolescent Health were performed to describe group differences in a broad range of…

Analyzed data from two data sets in the National Longitudinal Study of Adolescent Health Wave I to identify discrepancies between in-school questionnaire and in-home interview results. Identified a group of "jokester" adolescents likely to have identified themselves as adoptees, when they were not. Found evidence suggesting that this…