MMPI adolescent norms: patterns and trends across 4 decades

Area of Science:

• Psychological assessment
• Developmental psychology
• Psychometrics

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychological assessment tool.
• Adolescent norms for the MMPI were established in the mid-20th century.
• Changes in adolescent populations may affect the validity of existing MMPI norms.

Purpose of the Study:

• To examine the accuracy of existing Minnesota Multiphasic Personality Inventory (MMPI) adolescent norms.
• To assess the impact of sex and racial differences on MMPI adolescent data.
• To identify unique adolescent response patterns using Harris-Lingoes subscales.

Main Methods:

• Analysis of MMPI data from eight historical investigations (n = 17,286) and four contemporary studies (n = 1,758) of normal adolescents.
• Evaluation of MMPI data from Mayo Foundation and Norfolk samples against adult normative values.
• Examination of Harris-Lingoes content subscales for adolescent-specific response patterns.

Main Results:

• Existing MMPI adolescent norms (Marks et al., 1974) are adequate for samples collected between 1947 and 1965.
• Contemporary adolescent samples (post-1975) show elevated MMPI scores compared to historical norms.
• Harris-Lingoes subscales reveal unique adolescent developmental experiences.

Conclusions:

• Current MMPI adolescent norms require updating to accurately reflect contemporary adolescent populations.
• New, age-appropriate norms are necessary for accurate interpretation of MMPI clinical and special scales in adolescents.
• Understanding adolescent developmental experiences is crucial for refining psychological assessment tools.