Factor Structure of the Millon Adolescent Personality Inventory for Psychiatric Inpatients

A principal components factor analysis (with varimax rotation) was performed on the Millon Adolescent Personality Scale Base Rate scores of 335 adolescent psychiatric inpatients. A four-factor solution was obtained (accounting for 84.1% of the variance), which was similar to that obtained by Millon, et al. for the normative sample. Confirmatory factor analyses, however, using data obtained from computer-generated random responses to the test, also fit the inpatient and normative sample data very well. The factor structure of the Millon Adolescent Personality Inventory therefore was inferred to be driven by the considerable item-scale overlap that characterizes the test.

Comparison of the Millon Adolescent Personality Inventory and the Suicide Ideation Questionnaire-Junior with an Adolescent Inpatient Sample

The current investigation was undertaken to assess the correlation of scores on the Millon Adolescent Personality Inventory and the Suicide Ideation Questionnaire—Junior. 9 adolescents (aged 15 to 17 years), on being admitted to an inpatient psychiatric facility, were given the two inventories. Of the 20 categories on the Millon, scores on 10 were significantly correlated with scores on suicide ideation. High suicide ideators tended to experience school-related problems, report poor self-concept, have poor family rapport, and be overly sensitive. Results were discussed in light of the importance of finding a subtle and commonly administered assessment tool that would be useful for those who work with adolescents at risk for suicide.

Diagnosis of Disruptive Behavior Disorders using the Millon Adolescent Personality Inventory

Millon Adolescent Personality Inventory differential diagnosis of disruptive behavior disorder vs no behavior disorder was investigated. Results were twice cross-validated. Millon adolescent Scales 4, 5, 6, G, SS, and TT were closely related to diagnosis of behavior disorder. Two psychometric rules averaged 70% hits and 35% false positives over three samples, Rule 1 of >2 elevations (baserate score >63) among Scales 6-G-SS-TT and Rule 2 of Scale 4 elevated with Scale 5 or with one of 6-G-SS-TT. An ancillary rule was highly specific to behavior disorder (90%). Two broad dimensions or factors appeared to be represented in the key scales; Scales 4 and 5 exemplified a histrionic-narcissistic factor, while the 6-G-SS-TT combination typified behavioral conflict and instability.

Reflections on the Rorschach and the Millon Adolescent Personality Inventory

Although no significant relationships were found between presence of Rorschach reflection responses and scores on Millon Adolescent Personality Inventory Scales 5 and 6 of 26 boys and 30 girls who were psychiatric inpatients, significant differences within the reflection group were found for diagnosis on Scale 5.