Comparison of the Psychosis Proneness Based on the Existence of Persecutory Delusions and Grandiose Delusions in Nonclinical Population

Soo-Min Kwak; Samuel Suk-Hyun Hwang; Jinmi Seol; Yeni Kim; Hee Yeon Jung

doi:10.4306/jknpa.2013.52.2.91

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Kwak, Hwang, Seol, Kim, and Jung: Comparison of the Psychosis Proneness Based on the Existence of Persecutory Delusions and Grandiose Delusions in Nonclinical Population

Original Article

Journal of Korean Neuropsychiatric Association

Journal of Korean Neuropsychiatric Association 2013; 52(2): 91-97.

Published online: 31 March 2013

DOI: https://doi.org/10.4306/jknpa.2013.52.2.91

Comparison of the Psychosis Proneness Based on the Existence of Persecutory Delusions and Grandiose Delusions in Nonclinical Population

Soo-Min Kwak, MA¹, Samuel Suk-Hyun Hwang, PhD², Jinmi Seol, MA¹, Yeni Kim, MD, PhD³, Hee Yeon Jung, MD, PhD^1,⁴

¹Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Korea.

²Department of Addiction Rehabilitation & Social Welfare, Eulji University, Seungnam, Korea.

³Department of Adolescent Psychiatry, Seoul National Hospital, Seoul, Korea.

⁴Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine, Seoul, Korea.

Address for correspondence: Hee Yeon Jung, MD, PhD. Department of Psychiatry, SMG-SNU Boramae Medical Center, 20 Boramae-ro 5-gil, Dongjak-gu, Seoul 156-707, Korea. Tel +82-2-870-2461, Fax +82-2-870-2709, hyjung@snu.ac.kr

Received 2 October 2012 Revised 19 January 2013 Accepted 22 January 2013

Abstract

Objectives

Delusions are prevalent even among members of the general population, and persecutory delusions (PDs) and grandiose delusions (GDs) are most frequently found. In this study, we investigated the differences in the dimensions of delusional ideation, reported psychosis proneness, and subjective psychotic symptoms in nonclinical individuals stratified according to the existence of PDs and GDs.

Methods

A total of 311 nonclinical individuals completed the Peters et al Delusions Inventory 40 (PDI-40), Perceptual Aberration Scale (PAS), Magical Ideation Scale (MIS), Schizotypal Personality Scale (STA), and Symptom Check List-90-R (SCL-90-R). Individuals were grouped according to four types based on the existence of PDs and GDs in PDI-40 items.

Results

An analysis of variance revealed that the four groups differed significantly in total delusion score, distress, preoccupation, and conviction level of delusional ideation, PAS, MAS, STA, in total SCL-90-R scores, and all SCL-90-R sub symptoms. In post-hoc analysis, the group with both PDs and GDs showed the highest scores in all measures, compared with the other three groups.

Conclusion

We found that individuals with both PDs and GDs have a tendency to possess another delusional ideation and reported more distress, preoccupation, and conviction level of delusional ideation, psychosis proneness, and subjective symptoms. Existence of both PDs and GDs significantly elevated psychosis proneness in comparison to having only either one of them.

Keywords: Delusion proneness, Persecutory Delusional Ideation, Grandiose Delusional Ideation, Peters et al. Delusions Inventory-40

Figures and Tables

Table 1

Group differences of demographics, PDI, PAS, MIS, and STA

^***: p<0.001. PDs : Persecutory delusions, GDs : Grandiose delusions, PDI : Peters et al. Delusion Inventory, PDI- (PDs & GDs) : Other PDI scores, not PDs and GDs, PAS : Perceptual Aberration Scale, MIS : Magical Ideation Scale, STA : Schizotypal Personality Scale, SD : Standard deviation

Table 2

Group differences of SCL-90-R

^*: p<0.05, ^**: p<0.01, ^***: p<0.001. PDs : Persecutory delusions, GDs : Grandiose delusions, PDI : Peters et al. Delusion Inventory, SCL : Symptom Check List, SOM : Somatization, O-C : Obsessive-Compulsivity, I-S : Interpersonal Sensitivity, DEP : Depression, ANX : Anxiety, HOS : Hostility, PHOB: Phobic anxiety, PAR : Paranoid Ideation, PSY : Psychoticism, SD : Standard deviation

Notes

The authors have no financial conflicts of interest.

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