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      A Brief Assessment of Body Image Perception: Norm Values and Factorial Structure of the Short Version of the FKB-20

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          The Body Image Questionnaire-20 (FKB-20) is one of the most applied self-report measures in the context of body image assessment in German-speaking regions. A version of the FKB-20 capturing an ideal concept of body image is also available. A special property of the scale is its high sensitivity for individuals suffering from anorexia nervosa. The present research provided a short version of this scale (for both variants) and examined its validity in a representative sample ( N = 2,347) of the German population. We utilized factor analysis methods to identify the optimal short scale of the measure, finding excellent model fit and reliability for a two-factor model (FKB-6) for both real and ideal body image. Both versions of the FKB-6 can be considered invariant across sex and age groups. Good reliability indices were shown for both versions of the FKB-6. The reliability indices were similar to those mentioned in previous studies. Our study also revealed, that large discrepancies between the real and an ideal body image are correlated with somatic and body dysmorphic symptoms. Finally, we provided norm values for comparisons of individual scores with the general population. The FKB-6 is a valid and a reliable measure that economizes assessments by clinicians and researchers.

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            From alpha to omega: a practical solution to the pervasive problem of internal consistency estimation.

            Coefficient alpha is the most popular measure of reliability (and certainly of internal consistency reliability) reported in psychological research. This is noteworthy given the numerous deficiencies of coefficient alpha documented in the psychometric literature. This mismatch between theory and practice appears to arise partly because users of psychological scales are unfamiliar with the psychometric literature on coefficient alpha and partly because alternatives to alpha are not widely known. We present a brief review of the psychometric literature on coefficient alpha, followed by a practical alternative in the form of coefficient omega. To facilitate the shift from alpha to omega, we also present a brief guide to the calculation of point and interval estimates of omega using a free, open source software environment. © 2013 The British Psychological Society.
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              Sensitivity of Goodness of Fit Indexes to Lack of Measurement Invariance


                Author and article information

                Front Psychol
                Front Psychol
                Front. Psychol.
                Frontiers in Psychology
                Frontiers Media S.A.
                01 December 2020
                : 11
                1Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Division of Psychological and Social Medicine and Developmental Neurosciences, Research Group Applied Medical Psychology and Medical Sociology , Dresden, Germany
                2Department of Medical Psychology and Medical Sociology, Johannes-Gutenberg University Mainz , Mainz, Germany
                3Department of Applied Human Studies, University of Applied Sciences Magdeburg and Stendal , Stendal, Germany
                4Integrated Research and Treatment Center (IFB) Adiposity Diseases – Behavioral Medicine, Medical Psychology and Medical Sociology, University of Leipzig Medical Center , Leipzig, Germany
                5Department of Psychotherapy and Psychosomatic Medicine, University Hospital Leipzig , Leipzig, Germany
                6Department of Psychosomatic Medicine and Psychotherapy, University Medical Centre, Johannes Gutenberg University Mainz , Mainz, Germany
                Author notes

                Edited by: Andrea Greco, University of Bergamo, Italy

                Reviewed by: Cristina Senín-Calderón, University of Cádiz, Spain; Cinzia Castiglioni, Catholic University of the Sacred Heart, Italy; Agostino Brugnera, University of Bergamo, Italy

                *Correspondence: Hendrik Berth, h.berth@ 123456ukdd.de

                This article was submitted to Quantitative Psychology and Measurement, a section of the journal Frontiers in Psychology

                Copyright © 2020 Schmalbach, Schmalbach, Zenger, Berth, Albani, Petrowski and Brähler.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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                Figures: 0, Tables: 12, Equations: 0, References: 125, Pages: 14, Words: 0
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