A research team led by Clara Sophie Beer of LWL University Hospital Hamm for Child and Adolescent Psychiatry at Ruhr University Bochum, working with colleagues from the University of Hildesheim and Charité Universitätsmedizin Berlin, has now taken a step toward closing that gap. In a study published in BMC Psychology, the team evaluated whether the Body Checking and Avoidance Questionnaire, known as the BCAQ, can be used reliably and validly in female adolescents diagnosed with anorexia nervosa or atypical anorexia nervosa. The instrument is the only questionnaire designed to capture both checking and avoidance behaviors in a single measure, which makes it uniquely suited to assessing the full behavioral spectrum of body image distortion.

The conceptual logic behind the BCAQ is straightforward. Body image is conventionally divided into components: an affective component covering feelings about the body, a cognitive component covering beliefs and attitudes, a perceptual component covering how accurately people judge their size and shape, and a behavioral component covering what people actually do. Established instruments such as the Body Checking Questionnaire and the Body Image Avoidance Questionnaire each target one side of the behavioral picture, but the BCAQ, originally developed for adults, combines both. Its 27 items ask respondents how frequently they engage in specific actions, from scrutinizing particular body parts to wearing baggy clothing to sidestep attention. Whether those items make psychological sense to a 14-year-old, and whether they hang together as coherent scales in younger respondents, was precisely what the German team set out to test.

The study drew on anonymized routine clinical data from female adolescents treated for anorexia nervosa or atypical anorexia nervosa, the latter diagnosis applied when all criteria of anorexia are met except significant weight loss. The research was approved by the Ethics Committee of the Medical Faculty at Ruhr University Bochum, and because the analyses used anonymized clinical data, informed consent was not required under German data protection regulations, though patients and their legal guardians were informed that anonymized data might be used for research. This clinical sampling strategy matters because validation studies conducted only in healthy or community samples can say little about how a measure performs where it is needed most, among patients whose symptoms are severe enough to require treatment.

The psychometric work began with a confirmatory factor analysis, the standard technique for testing whether a questionnaire’s predefined structure fits new data. Here the news was initially sobering: the original 27-item BCAQ showed poor model fit in the adolescent sample. Fit indices, which include the comparative fit index, the Tucker-Lewis index, the root mean square error of approximation, and the standardized root mean square residual, all indicated that the adult-derived factor structure did not translate cleanly to this younger clinical group. Rather than abandoning the measure, the researchers turned to exploratory factor analysis, a more open-ended statistical approach that lets the data reveal their own underlying structure. This analysis flagged four items with low or inconsistent loadings, meaning those items did not correlate strongly or consistently with any coherent behavioral dimension in adolescents.

Removing those four items produced an adapted 23-item version, and the revised measure performed considerably better. The analyses yielded a preliminary three-factor structure, suggesting that checking and avoidance behaviors in adolescents organize into three distinguishable behavioral clusters rather than the two broad categories the original instrument assumed. Reliability, assessed with Cronbach’s alpha, ranged from 0.78 to 0.94 across the scales, values that sit within the range conventionally regarded as good for psychological instruments. Convergent validity, the degree to which the BCAQ scores correlate with related constructs measured by other questionnaires such as the Eating Disorder Examination Questionnaire and body shape concern measures, was satisfactory, indicating that the adapted measure taps the same underlying clinical reality as established adult instruments.

The known-groups comparisons, which test whether a measure distinguishes groups expected to differ, provided more limited and exploratory evidence. A small group difference emerged only for avoidance behavior, while checking scores did not separate the groups as clearly. The authors are careful to frame these findings as preliminary rather than definitive. Validation is never a single verdict but an accumulating body of evidence, and this study represents one early data point in what will need to be a longer process before the adapted BCAQ can be recommended for broad clinical use.

Why does a questionnaire validation study deserve attention beyond the psychometrics community? Because measurement is the foundation on which everything else in clinical science rests. Eating disorders carry among the highest mortality rates of any psychiatric condition, and they typically begin during adolescence, a developmental window when body image concerns intensify and early intervention can alter the trajectory of illness. If clinicians and researchers cannot accurately measure the behavioral symptoms of body image distortion in teenagers, they cannot track treatment progress, compare interventions, or identify which patients are at greatest risk. Instruments developed and tested exclusively in adults leave clinicians guessing about whether the questions even make sense to younger patients, whose bodies, social environments, and daily routines differ substantially from those of the grown-ups the items were written for.

The German team is explicit about the limits of the current evidence. The study examined temporal stability only indirectly, and the authors call for longitudinal research to evaluate how stable the measure’s scores are over time, an essential property for any instrument intended to monitor change during treatment. They also note that further work is needed in other groups of adolescents before the questionnaire can be recommended more broadly, since the current evidence comes from female patients with anorexia or atypical anorexia nervosa and may not generalize to boys, to adolescents with other eating disorder diagnoses such as bulimia nervosa or binge-eating disorder, or to community samples.

Even so, the study offers clinicians and researchers a promising tool at a moment when the need is acute. The adapted 23-item BCAQ provides preliminary evidence of good reliability and satisfactory convergent validity for assessing behavioral body image distortion in female adolescents with anorexia nervosa, filling a genuine gap in the assessment literature. For a field in which the behavioral symptoms of illness are often the most observable and the most treatable targets, having a validated way to measure them in the patients who need it most is a meaningful advance. The full open-access article, including supplementary materials detailing the factor analyses, is available from BMC Psychology for researchers who wish to build on this work.

Subject of Research: Validation of the Body Checking and Avoidance Questionnaire in adolescents with anorexia nervosa

Article Title: Measuring body checking and avoidance in adolescents: validation of a behavioral questionnaire

Article References: Beer, C. S., Zillmer, S., Drießnack, N., Jaite, C., & Legenbauer, T. (2026). Measuring body checking and avoidance in adolescents: validation of a behavioral questionnaire. BMC Psychology, 14(1), Article 1359. https://doi.org/10.1186/s40359-026-05614-y

Image Credits: AI Generated

DOI: 10.1186/s40359-026-05614-y

Keywords: eating disorders, body image, body checking, body avoidance, adolescence, psychological assessment, psychometrics, anorexia nervosa, BMC Psychology, Measuring, body, checking