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Psychometric evaluation of the English version of the Düsseldorf Orthorexie Scale (DOS) and the prevalence of orthorexia nervosa among a U.S. student sample.
Eat Weight Disord. 2019 Apr; 24(2):275-281.EW

Abstract

PURPOSE

Recently, the concept of orthorexia nervosa (ON) as a potential new variant of disordered eating behavior has gained popularity. However, published prevalence rates appear to be questionable given the lack of validity of the available questionnaires. The Düsseldorf Orthorexie Scale (DOS) is a validated questionnaire only available in German to measure orthorexic behavior.

METHODS

The DOS was translated into English using the back-translation process. Cronbach's alpha was used to establish internal consistency and an intra-class correlation coefficient was calculated to assess reliability. The Eating Habits Questionnaire (EHQ) was used to test construct validity and the Eating Disorders Inventory was used to test discriminant validity. Principal and confirmatory factor analyses were carried out to test the factor structure. The sample consists of 384 university students in the U.S.

RESULTS

English (E)-DOS and EHQ were highly correlated (r = 0.76, p < .001) indicating very good construct validity. Cronbach's alpha coefficient reached 0.88, indicating very good internal consistency. Confirmatory factor analyses revealed a poorly fitted one-factor model, but good results for the standardized coefficients for the 10 items ranging between 0.52 and 0.82 were found. According to the E-DOS, 8.0% of the students exceeded the preliminary cut-off score, while an additional 12.4% would be considered being at risk of developing ON.

CONCLUSIONS

The E-DOS appears to be a valid, reliable measure for assessing ON. The results revealed higher prevalence rates for orthorexic behavior among U.S. students compared to German students. Cultural aspects could play a role in those differences.

LEVEL OF EVIDENCE

Descriptive study, Level V.

Authors+Show Affiliations

Colorado School of Public Health at Colorado State University, Campus Delivery 1879, Sage Hall, Fort Collins, CO, 80523-1879, USA. Chrissy.chard@colostate.edu.University of Hohenheim, Stuttgart, Germany.Heinrich-Heine-University, Düsseldorf, Germany.University of Hohenheim, Stuttgart, Germany. N.Stroebele@uni-hohenheim.de.

Pub Type(s)

Journal Article
Validation Study

Language

eng

PubMed ID

30196526

Citation

Chard, Chrissy A., et al. "Psychometric Evaluation of the English Version of the Düsseldorf Orthorexie Scale (DOS) and the Prevalence of Orthorexia Nervosa Among a U.S. Student Sample." Eating and Weight Disorders : EWD, vol. 24, no. 2, 2019, pp. 275-281.
Chard CA, Hilzendegen C, Barthels F, et al. Psychometric evaluation of the English version of the Düsseldorf Orthorexie Scale (DOS) and the prevalence of orthorexia nervosa among a U.S. student sample. Eat Weight Disord. 2019;24(2):275-281.
Chard, C. A., Hilzendegen, C., Barthels, F., & Stroebele-Benschop, N. (2019). Psychometric evaluation of the English version of the Düsseldorf Orthorexie Scale (DOS) and the prevalence of orthorexia nervosa among a U.S. student sample. Eating and Weight Disorders : EWD, 24(2), 275-281. https://doi.org/10.1007/s40519-018-0570-6
Chard CA, et al. Psychometric Evaluation of the English Version of the Düsseldorf Orthorexie Scale (DOS) and the Prevalence of Orthorexia Nervosa Among a U.S. Student Sample. Eat Weight Disord. 2019;24(2):275-281. PubMed PMID: 30196526.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Psychometric evaluation of the English version of the Düsseldorf Orthorexie Scale (DOS) and the prevalence of orthorexia nervosa among a U.S. student sample. AU - Chard,Chrissy A, AU - Hilzendegen,Carolin, AU - Barthels,Friederike, AU - Stroebele-Benschop,Nanette, Y1 - 2018/09/08/ PY - 2018/05/30/received PY - 2018/08/17/accepted PY - 2018/9/10/pubmed PY - 2019/7/19/medline PY - 2018/9/10/entrez KW - College students KW - Disordered eating KW - Orthorexia nervosa KW - Validation study SP - 275 EP - 281 JF - Eating and weight disorders : EWD JO - Eat Weight Disord VL - 24 IS - 2 N2 - PURPOSE: Recently, the concept of orthorexia nervosa (ON) as a potential new variant of disordered eating behavior has gained popularity. However, published prevalence rates appear to be questionable given the lack of validity of the available questionnaires. The Düsseldorf Orthorexie Scale (DOS) is a validated questionnaire only available in German to measure orthorexic behavior. METHODS: The DOS was translated into English using the back-translation process. Cronbach's alpha was used to establish internal consistency and an intra-class correlation coefficient was calculated to assess reliability. The Eating Habits Questionnaire (EHQ) was used to test construct validity and the Eating Disorders Inventory was used to test discriminant validity. Principal and confirmatory factor analyses were carried out to test the factor structure. The sample consists of 384 university students in the U.S. RESULTS: English (E)-DOS and EHQ were highly correlated (r = 0.76, p < .001) indicating very good construct validity. Cronbach's alpha coefficient reached 0.88, indicating very good internal consistency. Confirmatory factor analyses revealed a poorly fitted one-factor model, but good results for the standardized coefficients for the 10 items ranging between 0.52 and 0.82 were found. According to the E-DOS, 8.0% of the students exceeded the preliminary cut-off score, while an additional 12.4% would be considered being at risk of developing ON. CONCLUSIONS: The E-DOS appears to be a valid, reliable measure for assessing ON. The results revealed higher prevalence rates for orthorexic behavior among U.S. students compared to German students. Cultural aspects could play a role in those differences. LEVEL OF EVIDENCE: Descriptive study, Level V. SN - 1590-1262 UR - https://www.unboundmedicine.com/medline/citation/30196526/Psychometric_evaluation_of_the_English_version_of_the_Düsseldorf_Orthorexie_Scale__DOS__and_the_prevalence_of_orthorexia_nervosa_among_a_U_S__student_sample_ L2 - https://dx.doi.org/10.1007/s40519-018-0570-6 DB - PRIME DP - Unbound Medicine ER -