A Psychometric Analysis of the Structured Clinical Interview for the DSM-5 Alternative Model for Personality Disorders Module I (SCID-5-AMPD-I): Level of Personality Functioning Scale

Benjamin Hummelen, Johan Braeken, Tore Buer Christensen, Tor Erik Nysaeter, Sara Germans Selvik, Kristoffer Walther, Geir Pedersen, Ingeborg Eikenaes, Muirne C. S. Paap*

*Corresponding author for this work

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Abstract

The current study aims to examine the psychometric properties of the Structured Clinical Interview for the DSM-5 Alternative Model for Personality Disorders Module I (SCID-5-AMPD-I) assessing the Level of Personality Functioning Scale (LPFS) in a heterogeneous sample of 282 nonpsychotic patients. Latent variable models were used to investigate the dimensionality of the LPFS. The results indicate that the LPFS, as assessed by the SCID-5-AMPD-I, can be considered as a unidimensional construct that can be measured reliably across a wide range of the latent trait. Threshold parameters for the 12 indicators of the LPFS increased gradually over the latent scale, indicating that the five LPFS levels were ordered as predicted by the model. In general, the increase of threshold parameters was relatively small for the shift from Level 2 to Level 3. A better distinction among the different severity levels might be obtained by fine-tuning the interview guidelines or the Level 2 indicators themselves.

Original languageEnglish
Pages (from-to)1320-1333
Number of pages14
JournalAssessment
Volume28
Issue number5
Early online date6-Nov-2020
DOIs
Publication statusPublished - Jun-2021

Keywords

  • Level of personality functioning
  • Alternative DSM-5 model for personality disorders
  • polytomous item response theory

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