Psychometric Properties of the MMPI-2-RF Somatic Complaints (RC1) Scale

Michael L. Thomas, Dona E.C. Locke

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The MMPI-2 Restructured Form (MMPI-2-RF; Tellegen & Ben-Porath, 2008) was designed to be psychometrically superior to its MMPI-2 counterpart. However, the test has yet to be extensively evaluated in diverse clinical settings. The purpose of this study was to examine the psychometric properties of the MMPI-2-RF Somatic Complaints (RC1) scale in a clinically relevant population. Participants were 399 patients diagnosed with either epilepsy or psychogenic nonepileptic seizures on the basis of video-electroencephalograph monitoring. The internal structure of the MMPI-2-RF was evaluated using taxometric, confirmatory factor analysis, and item response theory procedures. Data from 4 content-specific scales directly related to RC1 (Malaise, Gastrointestinal Complaints, Head Pain Complaints, and Neurological Complaints) indicated that the latent construct of somatization is a dimensional variable with a bifactor structure. However, consistent with the scale's construction, a unidimensional model also provided adequate fit. A 2-parameter logistic item response theory model better accounted for observed item responses than did 1- or 3-parameter models. Results suggest that the RC1 scale is most precise for T score estimates between 55 and 90. Overall, the scale appears to be well suited for the assessment of somatization.

Original languageEnglish (US)
Pages (from-to)492-503
Number of pages12
JournalPsychological Assessment
Volume22
Issue number3
DOIs
StatePublished - Sep 1 2010

Keywords

  • Confirmatory factor analysis
  • Item response theory
  • Minnesota multiphasic personality inventory-2 restructured form
  • Psychogenic nonepileptic seizures
  • Taxometrics

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health

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