title: Psychometric properties of Peters et al. delusions inventory-21 in adolescence.
abstract: We explored the psychometric properties of the Korean version of the Peters et al. delusions inventory-21 (PDI-21) and evaluated the item characteristics of the PDI-21 compared with the Magical Ideation Scale (MIS) in Korean community adolescents. Survey participants comprised 310 Year 10 students who were assessed with the following instruments: the PDI-21, the MIS, the Schizotypal Personality Scale (STA) and the symptom checklist-90-R (SCL-90-R). The item characteristics of the PDI-21 and MIS were also explored using item response theory (IRT). The PDI-21 exhibited good internal consistency and demonstrated significant correlations with the MIS, STA and all subscale scores of the SCL-90-R, indicating psychological distress in adolescents with high PDI-21 scores. We also found through IRT analysis that the PDI-21 provides more information at the lower range and the MIS at the higher range of delusion proneness. Our findings suggest that the PDI-21 is an effective and reliable self-report measure for assessment of delusion proneness and that the PDI-21 and the MIS may be used complementarily to assess a broad range of delusion proneness among community adolescents.
authors.affiliation: Department of Adolescent Psychiatry, Seoul National Hospital, Seoul, Republic of Korea.
authors.forename: Yeni
authors.initials: Y
authors.lastname: Kim
authors.forename: Jae Seung
authors.initials: JS
authors.lastname: Chang
authors.forename: Samuel
authors.initials: S
authors.lastname: Hwang
authors.forename: Jung Seo
authors.initials: JS
authors.lastname: Yi
authors.forename: In Hee
authors.initials: IH
authors.lastname: Cho
authors.forename: Hee Yeon
authors.initials: HY
authors.lastname: Jung
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D003702:Delusions / Q000175:diagnosis* / Q000523:psychology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010555:Personality Inventory; D011594:Psychometrics; D015203:Reproducibility of Results; D012569:Schizotypal Personality Disorder / Q000175:diagnosis*; D011795:Surveys and Questionnaires