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Using the 1983 norms for the MMPI: code type frequencies in four clinical samples.

R C Colligan, D Osborne, W M Swenson

    Journal of Clinical Psychology
    |September 1, 1985
    PubMed
    Summary
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    New norms for the Minnesota Multiphasic Personality Inventory (MMPI) were developed using contemporary adult data. These updated MMPI norms provide more accurate interpretation for both general and clinical populations.

    Area of Science:

    • Psychological assessment
    • Psychometrics
    • Clinical psychology

    Background:

    • The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychometric tool.
    • Original MMPI norms may not accurately reflect current adult populations.
    • Outdated norms can affect the validity of psychological assessments.

    Purpose of the Study:

    • To develop updated normative data for the MMPI based on a contemporary adult sample.
    • To create new scoring procedures that yield normalized T scores.
    • To enhance the interpretability and meaningfulness of MMPI results.

    Main Methods:

    • Collected MMPI responses from a large, random sample of midwestern adults (18-99 years old) without handicapping conditions.
    • Developed sex-specific normative tables reflecting the general adult population.

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  • Created age-adjusted normative tables, separate for each sex.
  • Implemented normalized T score transformations, replacing traditional linear transformations.

    • Main Results:

    • MMPI response patterns from the contemporary sample significantly differed from original norms.
    • New normative tables were established for general population comparisons and age-based adjustments.
    • Normalized T scores replaced traditional scoring, accounting for raw score distribution skewness.
    • Changes were observed at item, scale, and frequency levels of 1- and 2-point codes.

    Conclusions:

    • Updated MMPI norms based on contemporary data improve interpretive accuracy.
    • New scoring procedures and normative tables enhance the meaningfulness of MMPI assessments.
    • These revisions are crucial for valid psychological evaluations in current populations.