Validity of the Yale Food Addiction Scale for Children (YFAS-C): classical test theory and item response theory of the Persian YFAS-C

Lin, C.-Y., Imani, V., Griffiths, M.D. ORCID: 0000-0001-8880-6524 and Pakpour, A.H., 2020. Validity of the Yale Food Addiction Scale for Children (YFAS-C): classical test theory and item response theory of the Persian YFAS-C. Eating and Weight Disorders - Studies on Anorexia, Bulimia and Obesity. ISSN 1590-1262

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Abstract

Purpose:

To examine whether the child/adolescent version of the Yale Food Addiction Scale (YFAS-C) is valid to assess the Iranian adolescents who are overweight.

Methods:

After using an internationally standardized method to translate the YFAS-C into Persian, 1186 overweight/obese adolescents aged between 13 and 18 years participated in the present study [666 males; mean age=15.5 (SD=1.9) years; zBMI=2.5 (1.0) kg/m2 ]. All the participants completed the Persian YFAS-C alongside Persian versions of the following scales: Eating Disorder Examination Questionnaire (EDEQ), Clinical Impairment Assessment (CIA), Binge Eating Scale (BES), Eating Attitudes Test (EAT-26), and Depression, Anxiety, Stress Scale (DASS-21).

Results:

At the scale level, confrmatory factor analysis verifed the single-factor structure of the Persian YFAS-C. Additionally, the Persian YFAS-C had promising properties regarding internal consistency (KR20=0.81), test–retest reliability (intraclass correlation coefcient=0.83), separation reliability (person separation reliability=0.77; item separation reliability=0.98), and separation index (person separation index=2.04; item separation index=8.01). At the item level, all items had satisfactory properties in factor loadings, corrected item-total correlation, test–retest reliability, and inft and outft mean square. Moreover, no substantial diferential item functioning (DIF) was found concerning gender (male vs. female) or weight status (overweight vs. obesity). Signifcant and moderate correlations were found between the Persian YFAS-C and other psychometric scales assessing eating symptomatology and general psychopathology (r=0.352 to 0.484).

Conclusion:

The Persian YFAS-C is a valid instrument that assists healthcare providers in assessing food addiction among Iranian adolescents.

Level of evidence :

Level V, cross-sectional descriptive study.

Item Type: Journal article
Publication Title: Eating and Weight Disorders - Studies on Anorexia, Bulimia and Obesity
Creators: Lin, C.-Y., Imani, V., Griffiths, M.D. and Pakpour, A.H.
Publisher: Springer Science and Business Media LLC
Date: 16 July 2020
ISSN: 1590-1262
Identifiers:
NumberType
10.1007/s40519-020-00956-xDOI
1345207Other
Rights: © The Author(s) 2020. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
Divisions: Schools > School of Social Sciences
Record created by: Jill Tomkinson
Date Added: 20 Jul 2020 14:07
Last Modified: 06 Aug 2020 20:55
URI: http://irep.ntu.ac.uk/id/eprint/40253

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