Department of Psychology, Faculty of Education Sciences and Psychology, Ferdowsi University of Mashhad, Mashhad, Iran.
Department of Counseling, Faculty of Education and Psychology, Alzahra University, Tehran, Iran.
BMC Psychol. 2023 Sep 27;11(1):294. doi: 10.1186/s40359-023-01341-w.
Some individuals may manifest psychotic symptoms that do not fulfill the requisite clinical criteria for a formal diagnosis of psychosis. The assessment of susceptibility to delusions, encompassing both clinical and non-clinical cohorts, frequently makes use of the Peters et al. Delusions Inventory (PDI-40). This study aimed to evaluate the reliability and validity of the Persian version of Peters et al. Delusions Inventory (PDI-40) in Iranian non-clinical and clinical samples.
The present study employed a cross-sectional, correlational design in 2020. A total of 1402 Iranian participants were recruited for the study, which consisted of three distinct stages. The first stage involved an Exploratory Factor Analysis (EFA) conducted on a non-clinical sample of 512 participants. The second stage comprising different non-clinical sample 764 participants to perform a Confirmatory Factor Analysis (CFA). In the third stage, a clinical sample of 126 psychotic patients was compared to a non-clinical sample. All participants completed the PDI-40, the Community Assessment of Psychotic Experiences (CAPE-42), and the Depression, Anxiety, and Stress Scale (DASS-21). The internal structure of PDI-40 was examined through the analysis of its factor structure using LISREL 8.8.
The EFA analysis unveiled nine components within Persian version of PDI-40. The CFA analysis demonstrated an excellent fit of the nine-factor structure of Persian PDI-40 to the data. The total score exhibited high internal reliability, as indicated by Cronbach's alpha coefficient of 0.92. Moreover, Persian PDI-40 exhibited satisfactory evidence of convergent validity, as significant correlations were observed between dimensions of PDI-40 and subscales of CAPE-42 and DASS-21. Lastly, findings indicated that psychotic participants scored higher than non-clinical participants in all components of the PDI-40(p < 0.05).
Persian version of the PDI-40 demonstrates strong reliability and validity for assessing delusion proneness in both non-clinical and clinical samples in Iran. The observed distinctions between psychotic and non-clinical participants underscore its potential as a valuable tool for discerning delusion proneness in diverse contexts.
有些人可能表现出不符合精神病正式诊断标准的精神病症状。评估易患妄想症的倾向，包括临床和非临床队列，经常使用彼得斯等人的妄想症清单（PDI-40）。本研究旨在评估彼得斯等人的妄想症清单（PDI-40）的波斯语版本在伊朗非临床和临床样本中的可靠性和有效性。
本研究采用 2020 年的横断面相关性设计。共有 1402 名伊朗参与者被招募参加这项研究，研究分为三个阶段。第一阶段对 512 名非临床样本进行探索性因素分析（EFA）。第二阶段包括不同的非临床样本 764 名参与者进行验证性因素分析（CFA）。第三阶段，将 126 名精神病患者与非临床样本进行比较。所有参与者完成了 PDI-40、社区精神病体验评估（CAPE-42）和抑郁、焦虑和压力量表（DASS-21）。使用 LISREL 8.8 分析 PDI-40 的因子结构，以检查其内部结构。
EFA 分析揭示了 PDI-40 波斯语版本的九个组成部分。CFA 分析表明，PDI-40 的九因子结构与数据拟合良好。总分表现出较高的内部可靠性，Cronbach's alpha 系数为 0.92。此外，PDI-40 具有良好的收敛有效性证据，因为 PDI-40 的各个维度与 CAPE-42 和 DASS-21 的子量表之间存在显著相关性。最后，研究结果表明，精神病患者在 PDI-40 的所有组成部分上的得分均高于非临床患者（p<0.05）。
PDI-40 的波斯语版本在伊朗的非临床和临床样本中表现出较强的可靠性和有效性，用于评估易患妄想症的倾向。在精神病患者和非临床患者之间观察到的差异突出了它在不同背景下区分易患妄想症的潜在价值。
