Studies indicate that victimization by intimate partners accounts for 21 percent of violent crime toward women and about 2 percent toward men. The NIJ Research in Brief, Findings About Partner Violence From the Dunedin Multidisciplinary Health and Development Study, examines the continual nature of antisocial behavior from adolescence through adulthood in an attempt to explain partner violence. Results are derived from a longitudinal study of a birth cohort from Dunedin, New Zealand, conducted over the past 21 years. Among the findings discussed are that partner violence can be linked to a variety of mental illnesses, family adversity, lack of schooling, and conviction of various crimes.