Abstract
Aims
To explore the validity and recommend cut-off scores in an English-speaking sample for 9, 11, and 15-item versions of the ORTO measure for orthorexia, a proposed eating disorder characterised by a pathological obsession with consuming only ‘healthy’ foods.
Materials and methods
The sample comprised of 585 participants (82.4% female) who completed an online questionnaire containing the ORTO-15, Eating Attitudes test, Obsessive Compulsive Inventory Revised. A series of Confirmatory Factor Analyses were conducted to test model fit. Binary logistic linear regression and receiver-operating-characteristics (ROC) analyses were used to obtain cut-offs.
Results and conclusion
Results showed that none of the three published versions (9, 11, and 15-item) of the ORTO produced an acceptable model. Subsequent exploratory and confirmatory factor analyses yielded a seven-item version of the ORTO (ORTO-7) with a strong and stable factor structure. Analysis of cut-offs revealed that a cut-off score of equal or greater than 19 on the ORTO-7 represents probable orthorexia.
Level of evidence
Level V, descriptive study.
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Change history
01 June 2019
Due to an unfortunate error, interpretation of the ORTO-7 cut-off score is incorrect.
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This article is part of the topical collection on Orthorexia Nervosa.
Appendix: ORTO-7
Appendix: ORTO-7
Please indicate the degree to which the following items apply to you.
Scoring key:
1 = Always
2 = Often
3 = Sometimes
4 = Never
Item | |
---|---|
1. When eating, do you pay attention to the calories of the food? | ––– |
2. In the last 3 months, did the thought of food worry you? | ––– |
3. Are your eating choices conditioned by your worry about your health status? | ––– |
4. Does the thought about food worry you for more than 3 h a day? | ––– |
5. Do you think your mood affects your eating behaviour? | ––– |
6. Do you think that the conviction to eat only healthy foods changes your lifestyle (frequency of eating out, friends, etc?) | ––– |
7. Do you feel guilty when transgressing? | ––– |
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Moller, S., Apputhurai, P. & Knowles, S.R. Confirmatory factor analyses of the ORTO 15-, 11- and 9-item scales and recommendations for suggested cut-off scores. Eat Weight Disord 24, 21–28 (2019). https://doi.org/10.1007/s40519-018-0515-0
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DOI: https://doi.org/10.1007/s40519-018-0515-0