VALIDITY OF THE MMPI PERSONALITY-DISORDER SCALES (MMPI-PD)

The MMPI Personality Disorder scales, developed by Morey, Waugh, and B lashfield (1985), were validated on an inpatient population by compari ng 104 patients' MMPI-PD scores with the MCMI and with DSM-III-R diagn osis. Conservative significance levels were used to ensure more valid conclusions. Schizoid, Avoidant, Dependent, Histrionic, and Narcissist ic scales were correlated significantly. Passive-Aggressive, Schizotyp al, and Borderline scales did not correlate with corresponding MCMI sc ales. The MMPI-PD nonoverlapping scales were most effective in predict ing diagnosis, specifically the Personality Disorder NOS, Eccentric an d Borderline groups. The overlapping scales were not as effective in p redicting diagnosis, but best predicted the Eccentric and Borderline g roups. This study provides support for the validity of specific scales and circumscribed diagnostic utility for both measures.