Higher
aggression levels were found in AAS users than in nonusers
with both self-rated and clinician-rated measures; aggression
levels were associated with higher plasma testosterone
concentrations. However, the higher prevalence of DSM-IV
cluster B Personality Disorders, such as antisocial, borderline,
and histrionic ones, in AAS users than in nonusers, as
assessed with the Personality Disorder Questionnaire, could
have mediated these differences.