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Assessment, Vol. 12, No. 1, 79-85 (2005)
DOI: 10.1177/1073191104273515

Susceptibility of the MMPI-2 Clinical, Restructured Clinical (RC), and Content Scales to Overreporting and Underreporting

Martin Sellbom

Kent State University, msellbom{at}kent.edu

Yossef S. Ben-Porath

Kent State University

John R. Graham

Kent State University

Paul A. Arbisi

Minneapolis VA Medical Center and University of Minnesota-Twin Cities

R. Michael Bagby

Centre for Addiction and Mental Health, University of Toronto

The authors examined and compared the susceptibility of three Minnesota Multiphasic Personality Inventory-2 (MMPI-2) scale sets (Clinical, Restructured Clinical [RC], and Content) to over- and underreporting using five analog samples. Two samples of 85 and 191 undergraduate students, respectively, took the MMPI-2 under underreporting versus standard instructions. Three samples consisting of 42 undergraduates, 73 psychiatric inpatients, and 84 medical patients took the MMPI-2 under overreporting versus standard instructions. A comparison of the effect sizes across the three sets of scales indicated that Clinical Scale scores are not less susceptible to distortion than the Content or RC Scales. An apparent lesser susceptibility to underreporting for the Clinical Scales was an artifact of the subtle items’ effect on these scales.

Key Words: MMPI-2 • overreporting • malingering • underreporting • personality assessment


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