Zagaria Andrea, Barbaranelli Claudio, Mocini Edoardo, Lombardo Caterina
Department of Psychology, Sapienza University of Rome, Rome, Italy.
Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy.
J Eat Disord. 2023 Aug 24;11(1):144. doi: 10.1186/s40337-023-00858-0.
Orthorexia Nervosa (ON) is an emerging clinical condition characterized by a pathological fixation with healthy eating. Recently, the Orthorexia Nervosa Inventory (ONI) has emerged as a promising tool for assessing orthorexic tendencies and behaviours, aiming to overcome the well-established limitations of existing measures for ON. The present study aimed to examine the psychometric properties of the Italian version of the ONI.
A total of 879 participants (M = 33.22 years, SD = 9.19; 56.9% females) completed the ONI along with the Düsseldorf Orthorexia Scale (DOS), measures of disordered eating, obsessive-compulsive symptoms (OCD), and psychosocial impairment. To establish the factorial validity of the ONI, a competing measurement modeling approach was employed by comparing standard confirmatory factor analytic (CFA) with exploratory structural equation modeling (ESEM) solutions. Model-based omega coefficients were computed to examine the internal consistency of the scale. Factorial invariance tests across gender were conducted within a multi-group framework.
A three-factor first-order ESEM solution provided the best and most parsimonious representation of the data: χ(207) = 558.641, p < .001, RMSEA = 0.044 (90% CI 0.040-0.048), CFI = 0.976, TLI = 0.968, SRMR = 0.036. The three latent dimensions, labelled behaviors, emotions, and impairments, showed excellent internal consistency (ω > 0.88). Furthermore, ONI scores were found to be positively correlated with DOS scores, disordered eating, OCD symptoms, and psychosocial impairment, supporting its convergent and criterion validity. Eventually, the ONI was factorially invariant across gender.
Overall, the present study provides evidence for the satisfactory psychometric properties of the ONI in the Italian context, endorsing its use in both clinical and research settings.
正食癖（ON）是一种新出现的临床病症，其特征为对健康饮食的病态执着。最近，正食癖量表（ONI）已成为评估正食癖倾向和行为的一种很有前景的工具，旨在克服现有正食癖测量方法公认的局限性。本研究旨在检验意大利语版ONI的心理测量特性。
共有879名参与者（M = 33.22岁，标准差 = 9.19；56.9%为女性）完成了ONI以及杜塞尔多夫正食癖量表（DOS）、饮食失调测量、强迫症状（OCD）和心理社会功能损害测量。为了确定ONI的因子效度，采用了一种竞争性测量建模方法，将标准验证性因子分析（CFA）与探索性结构方程建模（ESEM）解决方案进行比较。计算基于模型的ω系数以检验该量表的内部一致性。在多组框架内进行跨性别因子不变性检验。
一个三因子一阶ESEM解决方案为数据提供了最佳且最简约的表示：χ(207) = 558.641，p <.001，RMSEA = 0.044（90%置信区间0.040 - 0.048），CFI = 0.976，TLI = 0.968，SRMR = 0.036。这三个潜在维度，标记为行为、情绪和损害，显示出极好的内部一致性（ω > 0.88）。此外，发现ONI得分与DOS得分、饮食失调、OCD症状和心理社会功能损害呈正相关，支持其聚合效度和效标效度。最终，ONI在性别上具有因子不变性。
总体而言，本研究为意大利语环境下ONI令人满意的心理测量特性提供了证据，支持其在临床和研究环境中的使用。
