The aging MMPI: development of contemporary norms

Area of Science:

• Psychological Assessment
• Psychometrics
• Clinical Psychology

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used, respected, and researched objective personality assessment.
• The original MMPI normative base was established in the late 1930s and early 1940s, making it outdated.
• A need exists to update the MMPI norms to reflect current population demographics.

Purpose of the Study:

• To develop new, updated normative data for the Minnesota Multiphasic Personality Inventory (MMPI).
• To create normalized T-score tables for specific age ranges and for adults in general.
• To enhance the accuracy and relevance of the MMPI for contemporary use.

Main Methods:

• A random sample of 1,408 subjects was selected, aged 18-99 years.
• Subjects were screened to exclude those with physical or mental health conditions.
• MMPI responses from this sample were used to generate new T-score tables for the 13 basic MMPI scales.

Main Results:

• New normalized T-score tables were developed for the 13 basic scales of the MMPI.
• The new norms are stratified by specific age ranges and for adults overall.
• These updated norms aim to improve the precision of MMPI interpretation.

Conclusions:

• The study successfully generated updated normative data for the MMPI.
• These new norms provide a more current standard for interpreting MMPI results.
• The updated MMPI norms are crucial for maintaining the instrument's clinical utility and validity.