Individuals with eating disorders (EDs) may be particularly susceptible to body image related cognitive fusion (i.e., excessive entanglement with one’s body image related thoughts such that they unduly influence on behavior). The Cognitive Fusion Questionnaire-Body Image (CFQ-BI) is the only existing measure of this construct, yet its psychometric properties have not been examined within a clinically diagnosed ED sample. The current study used confirmatory factor analysis and explored measurement invariance, construct validity, and incremental validity of the CFQ-BI when used with adolescent (n = 75) and adult (n = 100) females admitting to residential ED treatment. A modified version of the single-factor structure of the CFQ-BI best fit the data and configural, metric, and scalar invariance were supported across age groups (i.e., adolescents or adults) and ED behavioral presentations (i.e., restrictive behaviors or binge/purge behaviors). Adults’ and individuals with binge/purge behavioral presentations reported significantly more body image related fusion compared to adolescents and adults, respectively. Body image related psychological flexibility and ED severity were both significantly correlated CFQ-BI scores in expected directions. These findings suggest the CFQ-BI is a valid measure for assessing body image related fusion among adolescent and adult females with varying ED behavioral presentations. Implications and future research directions are discussed.

患有饮食失调 (ED) 的个体可能特别容易受到与身体形象相关的认知融合的影响（即，过度纠缠与身体形象相关的想法，从而过度影响行为）。认知融合问卷 - 身体图像 (CFQ-BI) 是该结构的唯一现有度量，但尚未在临床诊断的 ED 样本中检查其心理测量特性。当前的研究使用验证性因素分析并探讨了 CFQ-BI 在用于青少年 ( n = 75) 和成人 ( n )时的测量不变性、结构效度和增量效度 = 100) 女性接受住院 ED 治疗。CFQ-BI 的单因素结构的修改版本最适合数据，并且跨年龄组（即青少年或成人）和 ED 行为表现（即限制性行为或暴饮暴食）支持配置、度量和标量不变性。清除行为）。与青少年和成人相比，具有暴饮暴食/清除行为表现的成人和个人分别报告了更多与身体形象相关的融合。身体形象相关的心理灵活性和 ED 严重程度都与预期方向的 CFQ-BI 分数显着相关。这些发现表明 CFQ-BI 是评估具有不同 ED 行为表现的青少年和成年女性身体图像相关融合的有效措施。