Adolescence is a common period for eating disorder (ED) onset. The availability of psychometrically sound measures of ED psychopathology enables clinicians to accurately assess symptoms and monitor treatment outcomes continuously from adolescence and adulthood. The purpose of this study was to assess if the Eating Pathology Symptoms Inventory (EPSI) is invariant across adolescents and adults. Participants (N = 29,821) were adolescent (n = 5250) and adult (n = 24,571) users of the Recovery Record (RR) mobile phone application who provided EPSI responses through the application. Measurement invariance testing was conducted to assess invariance of the EPSI Body Dissatisfaction, Restricting, Excessive Exercise, Purging, Cognitive Restraint, and Binge Eating scales across adolescents (age 13 through 17) and adults (age 18 and older). Findings indicated that all EPSI factors administered in the RR app replicated in both adolescent and adult users. The EPSI factor structure was largely equivalent in adolescents and adults, demonstrating evidence for configural and metric invariance, as well as some evidence for scalar invariance. Our results indicated that EPSI scales measured the same constructs across development. Clinicians and researchers may benefit from utilizing the EPSI to measure ED psychopathology in adolescents and for continued progress monitoring into adulthood.

青春期是进食障碍 (ED) 发作的常见时期。ED 精神病理学的心理测量学健全测量的可用性使临床医生能够准确地评估症状并从青春期和成年期持续监测治疗结果。本研究的目的是评估饮食病理学症状量表 (EPSI) 在青少年和成人之间是否不变。参与者 ( N  = 29,821) 是青少年 ( n  = 5250) 和成人 ( n = 24,571) 通过应用程序提供 EPSI 响应的恢复记录 (RR) 手机应用程序用户。进行测量不变性测试以评估青少年（13 至 17 岁）和成人（18 岁及以上）的 EPSI 身体不满意、限制、过度运动、净化、认知约束和暴食量表的不变性。研究结果表明，RR 应用程序中管理的所有 EPSI 因素在青少年和成人用户中都存在。EPSI 因子结构在青少年和成人中基本相同，证明了配置和度量不变性的证据，以及一些标量不变性的证据。我们的结果表明，EPSI 量表在整个开发过程中测量了相同的结构。