Clinical cut‐off point for the Distrust dimension of the Dimensional Clinical Personality Inventory 2 (IDCP‐2)

Abstract

The Clinical Dimensional Personality Inventory 2 (IDCP-2) is a 206-item self-report tool developed for the assessment of 12 dimensions (divided into 47 factors) of personality pathology. One of the scales comprising the instrument, the Distrust scale, is intended to provide psychometric information on traits closely related to the Paranoid Personality Disorder (PPD). In the present research, we used the Item Response Theory and the Receiver Operating Characteristic curve analysis to establish a clinical meaningful cutoff for the Distrust scale. Participants were 1,679 adults, among outpatients diagnosed with PPD, outpatients diagnosed with other PDs, and adults from the community. The Wright map revealed that outpatients were located at the very high levels on the latent continuum of the Distrust scale, with a very large effect size for the mean difference between patients and non-patients. The ROC curve supported a cutoff at -1.00 score in theta standardization which yielded 0.87 of sensitivity and 0.54 of specificity. Findings from the present investigation suggest the IDCP-2 Distrust scale is useful as a screening tool of the core features of the PPD. We address potential clinical applications for the instrument and discuss limitations from the present study.

In search of hidden threats: A scoping review on paranoid presentations in personality disorders

“…Our sources unequivocally indicate that doubts about others' intentions are particularly descriptive of PPD, according to PD experts (Samuel et al, 2012) and clinicians (Livesley et al, 1987). The same conclusions have been drawn in studies comparing PPD patients with healthy controls (Carvalho & Lima Costa, 2018;Wang et al, 2006), patients with PDs other than PPD (e.g., HPD, SPD) and even PPD patients having other comorbid PDs (Carvalho & Lima Costa, 2018;Wang et al, 2006). In three studies, doubts about others' intentions positively correlated with PPD (categorical or dimensional score), although the effect size was highly variable: from r = .34 (Hummelen et al, 2012) to r = .74 (Livesley & Schroeder, 1990), and up to r = .84 (Falkum et al, 2009).…”

“…In three studies, doubts about others' intentions positively correlated with PPD (categorical or dimensional score), although the effect size was highly variable: from r = .34 (Hummelen et al, 2012) to r = .74 (Livesley & Schroeder, 1990), and up to r = .84 (Falkum et al, 2009). Doubts about others' intentions also uniquely contributed to the diagnosis of PPD above and beyond other variables (e.g., other PD trait scores; Bach et al, 2017; Bamelis et al, 2011), and manifested moderate‐to‐high ability to discriminate between patients with and without PPD (Carvalho & Lima Costa, 2018; Falkum et al, 2009; Pfohl et al, 1986).…”

Verification of the Internal Structure of the Dimensional Clinical Personality Inventory 2 in a Brazilian Community Sample

“…It is a self-report scale composed of 206 items to measure pathological traits from a dimensional perspective. Validity based on internal structure and relationship to external criteria has been observed in previous studies (e.g., Carvalho & Costa, 2018;Carvalho, Sette, & Miguel, 2018;Carvalho, Zuanazzi, & Miguel, 2019). Previous literature provides only fragments of the internal structure of idcp-2 (e.g., Carvalho, 2018;Carvalho & Arruda, 2016;Carvalho & Sette, 2017), indicating a structure of 47 factors grouped in 12 dimensions.…”