Confirmatory Validation and Measurement Equivalence of the Eating Loss of Control Scale in Binge Eating and Non-Clinical Samples
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Although Loss of Control (LOC) is a transdiagnostic factor in eating pathology, there are few standalone assessments of LOC. The objective of this study was to evaluate the uni-dimensionality and measurement equivalence of the Eating Loss of Control Scale (ELOCS). Confirmatory factor analyses were used to achieve a well-fitting uni-dimensional model in clinical (N = 226) and non-clinical (N = 476) samples. Measurement equivalence was tested in a factor analytic framework, and effect sizes were computed to evaluate the impact of non-equivalence. A well-fitting model was achieved in both samples after the removal of 4 items. The instrument showed configural equivalence but not metric equivalence. Results suggest that the ELOCS is a reliable and valid measure of LOC in clinical and non-clinical samples. However, while the nature of the LOC construct is similar across binge eating and non-clinical participants, comparisons of ELOCS across these groups are affected by measurement non-equivalence. This research also revealed novel insights into the relative sensitivity of model fitting and effect size approaches to investigating measurement equivalence.
KeywordsLoss of control Measurement equivalence Measurement invariance Assessment Eating disorder Binge eating
Compliance with Ethical Standards
Conflict of Interest
Christopher J. Hopwood, Christopher D. Nye, Kerstin K. Blomquist, and Carlos M. Grilo declare that they have no conflict of interest.
Informed consent was obtained from all individual participants included in this study. All procedures were in accordance with ethical standards of the institutions where the research was conducted and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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