Cross-validation of MMPI and MMPI-2 predictor scales

Nineteen Minnesota Multiphasic Personality Inventory (MMPI) or revised Minnesota Multiphasic Personality Inventory (MMPI-2) scales, purported to be predictive of treatment outcome, were related to length of stay (LOS) in a domiciliary and to discharge status from a domiciliary for 335 subjects. The revised MacAndrew Alcoholism Scale (MAC-R), Addiction Acknowledgement Scale (AAS), and Addiction Potential Scale (APS), scales indicating a propensity to use illicit substances, and the Psychopathic Deviate Scale (Pd), indicating acting-out, all correlate negatively with length of stay. AAS also correlates negatively with regular/irregular discharge. Other scales expected to predict treatment outcome do not significantly correlate with either length of stay or type of discharge.