Minnesota Multiphasic Personality Inventory-adolescent-restructured Form (MMPI-A-RF): Characteristics of Conduct Disorder

Disruptive and conduct behaviors are the most common conditions used to help adolescent patients refer to mental health clinics for counseling. The prevalence of this disorder is increasing and it is necessary to concentrate on this topic. The comorbidity of conduct disorder (CD) with other emotional and behavioral problems is common. One of the comorbidity disorders for which contradictory results are reported is attention deficit hyperactivity disorder (ADHD). Several studies have demonstrated the comorbidity of these two disorders in patients with a younger age of onset, more severe symptoms, and more stable disease. Hence, this study determines the prognostic value of the Minnesota multiphasic personality inventory adolescent-restructured form (MMPI-A-RF) for CDs and investigates the effect of comorbidities, such as ADHD.

The sample of the present comparative casual study consisted of 295 adolescents who were selected by purposeful sampling, based on the current and the Kiddie schedule for affective disorder and schizophrenia-present and lifetime for school-age children (6-18 years old) and the final version of the MMPI-A-RF questionnaire. The Mean±SD of all the MMPI-A-RF scores were compared among three groups of patients with CD (n=40), patients with a comorbid diagnosis of conduct disorder and ADHD (n=68 people), and patients with other psychiatric disorders (mood and anxiety disorders). Analysis of variance was used to determine the significance of differences among the three groups. If the deviations were significant, the Games–Howell post hoc test was used to inspect differences between the groups.

The comparison of CD and CD+ADHD patients with other disorders revealed meaningful differences in almost all the indicators related to externalizing problems. The CD+ADHD group had markedly greater scores on the scales of antisocial behaviors (P<0.001), aggressive-revised personality (P<0.001), and conduct problems (P<0.001) compared to the CD group and other psychiatric disorders group.

The results are consistent with the background and revealed more severe symptoms and more functional degradation in the CD+ADHD group compared to the CD and other psychiatric disorders group. This subgroup can have different risk symptoms, clinical courses, and drug responses. MMPI-A-RF can supply valuable information about the comorbidity of psychiatric disorders.