Context Although both genetic and environmental factors affect risk of individual personality
disorders (PDs), we know little of how they contribute to the pattern of comorbidity between
the PDs in theDiagnostic and Statistical Manual of Mental Disorders (Fourth Edition)(DSM-
IV). Objective To clarify the structure of the genetic and environmental risk factors for the
10DSM-IVPDs. Design Assessment of PDs at personal interview and multivariate twin
modeling with the Mx program. Setting General community. Participants A total of 2794 …