Asl Esmaeil Mousavi, Mahaki Behzad, Ashouri Ahmad, Mohammadian Youkhabeh
Department of Psychiatry, Golestan Hospital, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Department of Biostatistics, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Int J Prev Med. 2022 Dec 26;13:153. doi: 10.4103/ijpvm.IJPVM_310_20. eCollection 2022.
Perfectionism is a key construct for understanding psychopathology. In societies with varying cultures, studying the psychometric properties of tools can help with their external validity. This research aimed at standardization and validation of the Eating Disorder Inventory-Perfectionism (EDI-P) scale in Iran.
The Persian version of EDI-P was formed through forward translation, reconciliation, and back translation. A total of 302 students were selected using convenience sampling method and' they completed a set of questionnaires, including the EDI-P, Weight Efficacy Lifestyle Questionnaire-Short Form (WEL-SF), Eating Attitude Test-16 (EAT-16), Self-esteem scale (SES), Difficulties in Emotion Regulation Scale-16 (DERS-16), and Self-compassion scale (SCS) Short Form. The construct validity of the EDI-P was assessed using confirmatory factor analysis and divergent and convergent validity. Internal consistency and test-retest reliability (2 weeks' interval) were applied to evaluate reliability. LISREL (version 8.8) and SSPS (version 22) software were used for data analysis purpose.
EDI-P scales and subscales were found to be a valid and reliable measure, with good internal consistency and good test-retest reliability in the nonclinical sample. Cronbach's alpha coefficient for the whole scale, socially prescribed, and self-oriented were found to be 0.74, 0.68, and 0.67, respectively. Test-retest reliability for the whole scale, socially prescribed, and self-oriented were found to be 0.88, 0.80, and 0.87, respectively. Convergent validity and divergent validity were good (Normed Fit Index [NFI] = 0.94, Incremental Fit Index = 0.95, root mean square error of approximation = 0.08, goodness of fit index = 0.97, Non-normed Fit Index [NNFI] = 0.91, and comparative fit index = 0.95). The results of this study provide support for the two-factor model of EDI-P.
The EDI-P showed good validity and reliability and could be useful in assessing perfectionism in Iranian population. The EDI-P shows notable promise as a measure for use in eating research and clinical settings.
完美主义是理解精神病理学的关键概念。在文化各异的社会中，研究工具的心理测量特性有助于其外部效度。本研究旨在对伊朗版的饮食失调问卷 - 完美主义（EDI - P）量表进行标准化和验证。
EDI - P的波斯语版本通过正向翻译、核对和回译形成。采用便利抽样法选取了302名学生，他们完成了一组问卷，包括EDI - P、体重效能生活方式问卷简版（WEL - SF）、饮食态度测试 - 16（EAT - 16）、自尊量表（SES）、情绪调节困难量表 - 16（DERS - 16）和自我同情量表简版（SCS）。使用验证性因素分析以及区分效度和聚合效度来评估EDI - P的结构效度。应用内部一致性和重测信度（间隔2周）来评估信度。使用LISREL（8.8版）和SSPS（22版）软件进行数据分析。
在非临床样本中，EDI - P量表及子量表被发现是有效且可靠的测量工具，具有良好的内部一致性和良好的重测信度。整个量表、社会规定性完美主义和自我导向完美主义的克朗巴哈α系数分别为0.74、0.68和0.67。整个量表、社会规定性完美主义和自我导向完美主义的重测信度分别为0.88、0.80和0.87。聚合效度和区分效度良好（规范拟合指数[NFI]=0.94，增量拟合指数=0.95，近似均方根误差=0.08，拟合优度指数=0.97，非规范拟合指数[NNFI]=0.91，比较拟合指数=0.95）。本研究结果为EDI - P的双因素模型提供了支持。
EDI - P显示出良好的效度和信度，可用于评估伊朗人群的完美主义。EDI - P作为一种用于饮食研究和临床环境的测量工具具有显著前景。
