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Objective: The aim of this study was to develop, evaluate, and standardize a short form of the well-established Eating Disorder Examination-Questionnaire (EDE-Q). The newly developed EDE-Q8 was required to reflect the originally postulated structure of the EDE-Q. Method: Data were drawn from two nationwide representative population surveys in Germany: a survey conducted to develop the EDE-Q8 in 2009 (N = 2520); and a survey conducted in 2013 (N = 2508) for the evaluation and calculation of EDE-Q8 percentiles. Results: The EDE-Q8 had excellent item characteristics, very good reliability and a very good model fit for the postulated second-order factorial structure. Furthermore, a strong correlation between the EDE-Q8 and a 13 item short form of the Eating Attitudes Test was observed. Discussion: The EDE-Q8 appears to be particularly suitable in epidemiological research, when an economical assessment of global eating disorder psychopathology is required.

Background: Overweight and obesity are significant public health concerns that are prevalent in younger age cohorts. Preventive or therapeutic interventions are difficult to implement and maintain over time. On the other hand, the majority of adolescents in the United States have a smartphone, representing a huge potential for innovative digitized interventions, such as weight loss programs delivered via smartphone applications. Although the number of available smartphone applications is increasing, evidence for their effectiveness in weight loss is insufficient. Therefore, the proposed study aims to assess the efficacy of a gamification-based smartphone application for weight loss in overweight and obese adolescents. The trial is designed to be a phase II, single-centre, two-arm, triple-blinded, randomized controlled trial (RCT) with a duration of 6 months. Method: The intervention consists of a smartphone application that provides both tracking and gamification elements, while the control arm consists of an identically designed application solely with tracking features of health information. The proposed trial will be conducted in an urban primary care clinic of an academic centre in the United States of America, with expertise in the management of overweight and obese adolescents. Eligible adolescents will be followed for 6 months. Changes in body mass index z score from baseline to 6 months will be the primary outcome. Secondary objectives will explore the effects of the gamification-based application on adherence, as well as anthropometric, metabolic and behavioural changes. A required sample size of 108 participants (54 participants per group) was calculated. Discussion: The benefits of the proposed study include mid-term effects in weight reduction for overweight and obese adolescents. The current proposal will contribute to fill a gap in the literature on the mid-term effects of gamification-based interventions to control weight in adolescents. This trial is a well-designed RCT that is in line with the Consolidated Standards of Reporting Trials statement.