Stephan Moller1, Pragalathan Apputhurai1, Simon R Knowles2,3,4,5,6. 1. Faculty of Health Arts, and Design, Swinburne University of Technology, Melbourne, Australia. 2. Faculty of Health Arts, and Design, Swinburne University of Technology, Melbourne, Australia. sknowles@swin.edu.au. 3. Department of Gastroenterology, Royal Melbourne Hospital, Melbourne, Australia. sknowles@swin.edu.au. 4. Department of Gastroenterology, The Alfred Hospital, Melbourne, Australia. sknowles@swin.edu.au. 5. Department of Mental Health, St Vincent's Hospital, Melbourne, Australia. sknowles@swin.edu.au. 6. University of Melbourne, Melbourne, Australia. sknowles@swin.edu.au.
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.
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.
Authors: María Laura Parra-Fernández; María Dolores Onieva-Zafra; Juan José Fernández-Muñoz; Alicja Głębocka; Elia Fernández-Martínez; Anna Brytek-Matera Journal: Nutrients Date: 2021-06-10 Impact factor: 5.717