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Journal of Psychopathology and Behavioral Assessment

Gepubliceerd in:

01-12-2009

Eating Disorders Inventory: Assessment of its Construct Validity in a Nonclinical French Sample of Adolescents

Auteurs: Christophe Maïano, Alexandre J. S. Morin, Johana Monthuy-Blanc, Jean-Marie Garbarino, Yannick Stephan

Gepubliceerd in: Journal of Psychopathology and Behavioral Assessment | Uitgave 4/2009

Abstract

Recent studies have questioned the appropriateness of the original Eating Disorders Inventory (EDI) in nonclinical samples of adolescents. The main objective of the present series of studies is to systematically test the construct validity of the EDI (i.e. content, factorial, convergent, discriminant and discriminative) in a nonclinical sample of French adolescents. A total sample of 1,323 adolescents was involved in these five studies. The factorial validity and the measurement invariance of the EDI were verified through confirmatory factorial analyses. Correlation and student t-tests were also used to test the convergent and discriminative validity of the EDI. Results from the first study confirmed the unsuitability of the French original EDI for young adolescents. Items were re-worded and an adaptation for adolescents was developed (EDI-A). The following four studies provided support for the factorial validity, measurement invariance, reliability, convergent validity and discriminant validity for a short form (i.e. 24 items) of the EDI-A. The present results thus provide preliminary evidence regarding the construct validity of the 24-item EDI-A for French nonclinical adolescents. Recommendations for future uses and research activities with this instrument in French speaking adolescents are outlined.

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It is a version of the EDI-2 questionnaire that has been developed especially for children and adolescents. In this adaptation the wording of the EDI-2 was modified to be consistent with youth’s lower levels of vocabulary.

All participants gave written informed consent, and the research protocol was approved by the local Ethical Committee.

All participants met the following inclusion criteria: (i) they had no self-reported history of eating disorders and obesity and were neither underweight, overweight or obese at the time of the study (according to body mass index cut-off scores for males and females adolescents provided by Cole et al. 2000, 2007); (ii) they had to be schooled in regular classes and thus presented no intellectual, motor or sensory disability (according to the French education policies); (iii) they had never repeated a school year according to their self-reports.

The original untransformed scales were used, in all analyses, rather than the suggested “clinical” recoded scales (scores ranging from 0 to 3 with zero combining the three lower levels of the original six-point scale; see Garner et al. 1983). Indeed, many authors (Eklund et al. 2005; Lee et al. 1997; Machado et al. 2001; Schoemaker et al. 1994; van Strien and Ouwens 2003) showed that the transformation of the original scale to a four-point scale seriously damaged the validity and integrity of the EDI in nonclinical samples. This appears to be related to the resulting lower variability of the data and higher levels of skewness, which affected its factorial integrity and internal consistency.

Details about item-specific results are available upon request from the first author.

All participants gave written informed consent, and the research protocol was approved by the local Ethical Committee.

The French version of the EAT-26 (Leichner et al. 1994) was also used to confirm the results obtained with the MINI. Results from the EAT-26 both demonstrated that all patients had a score ≥20, and that all nonclinical adolescents had a score <20.

To ensure comparability with Garner's (1991b) original results, the discriminative analyses and cut-off scores were also computed for the transformed scores. These detailed results are available upon request from the first author.

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Titel: Eating Disorders Inventory: Assessment of its Construct Validity in a Nonclinical French Sample of Adolescents
Auteurs: Christophe Maïano
Alexandre J. S. Morin
Johana Monthuy-Blanc
Jean-Marie Garbarino
Yannick Stephan
Publicatiedatum: 01-12-2009
Uitgeverij: Springer US
Gepubliceerd in: Journal of Psychopathology and Behavioral Assessment / Uitgave 4/2009
Print ISSN: 0882-2689
Elektronisch ISSN: 1573-3505
DOI: https://doi.org/10.1007/s10862-009-9128-2

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