Longitudinal post-validation of the MMPI Escape (EC) and Prison Adjustment (AP) scales

Area of Science:

• Forensic Psychology
• Correctional Psychology
• Psychometric Assessment

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychological assessment tool.
• Previous research has explored the utility of specific MMPI scales in correctional settings.
• The MMPI Escape (Ec) and Prison Adjustment (Ap) scales were developed to assess risk factors in incarcerated populations.

Purpose of the Study:

• To conduct a 3-year longitudinal post-validation study of the MMPI Ec and Ap scales.
• To assess the continued effectiveness of these scales in predicting inmate behavior within the North Carolina Correctional System.

Main Methods:

• A longitudinal study was conducted over 3 years.
• Data from 301 male felon inmates with sentences of 5 years or more were analyzed.
• MMPI Ec and Ap scale scores were correlated with escape and major rule infraction records.

Main Results:

• The MMPI Ec and Ap scales demonstrated continued effectiveness in predicting escape from secure prison units.
• The scales also effectively predicted major rule infractions, regardless of the level of custodial control.
• A statistically significant relationship was found between scale scores and behavioral outcomes.

Conclusions:

• The MMPI Ec and Ap scales remain valid and effective instruments for inmate classification and risk assessment.
• Caution is advised against relying solely on Ec and Ap scale scores; supportive classification data is recommended.
• These findings support the ongoing use of MMPI scales in correctional psychology for behavioral prediction.