Editing Histrionic personality disorder (section)

=== Genetic ===
Twin studies have aided in breaking down the [[Nature vs. Nurture|genetic vs. environment]] debate. A twin study conducted by the Department of Psychology at the [[University of Oslo]] attempted to establish a correlation between genetics and [[Personality disorder|Cluster B personality disorders]]. With a test sample of 221 twins, 92 [[Twin#Types and zygosity|monozygotic]] and 129 [[Twin#Types and zygosity|dizygotic]], researchers interviewed the subjects using the [[Structured Clinical Interview for DSM|Structured Clinical Interview for DSM-III-R]] Personality Disorders (SCID-II) and concluded that there was a [[Correlation and dependence|correlation]] of 0.67 that histrionic personality disorder is hereditary.<ref name=":4" />