Hosseini Seyed Ruhollah, Maghsoudi Sepehr, Firoozabadi Abbas, Ghanbari Nikzad, Shamsaei Maryam
Department of Psychology, Faculty of Education Sciences and Psychology, Ferdowsi University of Mashhad, Mashhad, Iran.
Department of Social and Organizational Psychology, Faculty of Social Sciences, Leiden University, Leiden, Netherlands.
BMC Psychiatry. 2025 Jan 3;25(1):8. doi: 10.1186/s12888-024-06399-3.
Dissociative experiences are described as crucial psychological mechanisms involving the organism's responses to severe psychological traumas and unpleasant past experiences. This research was conducted to examine the psychometric properties of the Dissociative Experiences Measure, Oxford (DEMO) in the Iranian general population.
This study used cross-sectional correlation, and the statistical population consisted of Iranians over 15 years old. Among them, 712 subjects were chosen as the study sample using the convenience sampling technique. Data were acquired between February and April 2022 using DEMO, Dissociative Experiences Scale II (DES-II), and Depression Anxiety and Stress Scale (DASS-21). In order to determine DEMO's psychometric properties, Confirmatory Factor Analysis (CFA) was used to investigate the factorial structure, Cronbach's alpha analyses to examine the internal consistency reliability, and Pearson correlation analyses to examine the relationships between DEMO's subscales and the subscales of DES-II and DASS-21, indicating convergent validity. In order to analyze the data, LISREL 8.0 and SPSS-26 were used.
Based on the results of the CFA, the proposed five-factor structure of DEMO showed an acceptable fit to the data (χ² = 1939.81, SRMR = 0.078, CFI = 0.96, RMSEA = 0.074). The internal reliability was satisfactory for the total scale (Cronbach's alpha = 0.93) and the five subscales (Cronbach's alpha = 0.89 for unreality, 0.87 for numb and disconnected, 0.80 for memory blanks, 0.85 for zoned out, and 0.79 for vivid internal world). The CFA results indicated that the five factors explained 60.69% of the variance. Significant correlations were observed between the DEMO subscales and the respective subscales of DES-II and DASS-21, confirming the measure's convergent validity.
It can be concluded from the results of this study that the DEMO has high reliability and validity among the Iranian general population.
分离体验被描述为涉及机体对严重心理创伤和不愉快过往经历反应的关键心理机制。本研究旨在检验牛津分离体验量表（DEMO）在伊朗普通人群中的心理测量特性。
本研究采用横断面相关性研究，统计人群为15岁以上的伊朗人。其中，采用便利抽样技术选取712名受试者作为研究样本。2022年2月至4月期间，使用DEMO、分离体验量表II（DES-II）和抑郁焦虑压力量表（DASS-21）收集数据。为了确定DEMO的心理测量特性，采用验证性因素分析（CFA）来研究因子结构，采用克朗巴哈α分析来检验内部一致性信度，采用皮尔逊相关分析来检验DEMO子量表与DES-II和DASS-21子量表之间的关系，以表明收敛效度。为了分析数据，使用了LISREL 8.0和SPSS-26。
基于CFA的结果，DEMO提出的五因素结构与数据显示出可接受的拟合度（χ² = 1939.81，SRMR = 0.078，CFI = 0.96，RMSEA = 0.074）。总量表（克朗巴哈α = 0.93）和五个子量表的内部信度令人满意（不真实感的克朗巴哈α = 0.89，麻木和脱节的克朗巴哈α = 0.87，记忆空白的克朗巴哈α = 0.80，走神的克朗巴哈α = 0.85，生动内心世界的克朗巴哈α = 0.79）。CFA结果表明，这五个因素解释了60.69%的方差。在DEMO子量表与DES-II和DASS-21各自的子量表之间观察到显著相关性，证实了该量表的收敛效度。
从本研究结果可以得出结论，DEMO在伊朗普通人群中具有较高的信度和效度。
