Omar Sanchez-Armass1, Marcela Raffaelli2, Flavia Cristina Drumond Andrade3, Angela R Wiley2, Aida Nacielli Morales Noyola4, Alejandra Cepeda Arguelles4, Celia Aradillas-Garcia5. 1. School of Psychology, Universidad Autónoma de San Luis Potosí, Carretera Central Km. 424.5, 78494, San Luis Potosí, Mexico. omarsac@gmail.com. 2. Department of Human Development and Family Studies, University of Illinois at Urbana-Champaign, 2003 Doris Kelley Christopher Hall, Urbana, IL, 61801, USA. 3. Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, 2011 Huff Hall, 1206 S. Fourth St., Champaign, IL, 6182, USA. 4. School of Psychology, Universidad Autónoma de San Luis Potosí, Carretera Central Km. 424.5, 78494, San Luis Potosí, Mexico. 5. School of Medicine, Universidad Autónoma de San Luis Potosí, Avenida Venustiano Carranza No 2405., Col. Los filtros, 7821, San Luis Potosí, Mexico.
Abstract
PURPOSE: To evaluate the criterion validity and diagnostic utility of the SCOFF, a brief eating disorder (ED) screening instrument, in a Mexican sample. METHODS: The study was conducted in two phases in 2012. Phase I involved the administration of self-report measures [the SCOFF and the Eating Disorder Inventory-2, (EDI-2)] to 1057 students aged 17-56 years (M age = 21.0, SD = 3.4; 67 % female) from three colleges at the Universidad Autónoma de San Luis Potosí, Mexico. In Phase II, a random subsample of these students (n = 104) participated in the eating disorder examination, a structured interview that yields ED diagnoses. Analyses were conducted to evaluate the SCOFF's criterion validity by examining (a) correlations between scores on the SCOFF and the EDI-2 and (b) the SCOFF's ability to differentiate diagnosed ED cases and non-cases. RESULTS: EDI-2 subscales showed high correlations with the SCOFF scores proving initial evidence of criterion validity. A score of two points on the SCOFF optimized the sensitivity (78 %) and specificity (84 %). With this cutoff, the SCOFF correctly classified over half the cases (PPV = 58 %) and screened out the majority of non-cases (NPV = 93 %) providing further evidence of criterion validity. Analyses were repeated separately for men and women, yielding gender-specific information on the SCOFF's performance. CONCLUSIONS: Taken as a whole, results indicated that the SCOFF can be a useful tool for identifying Mexican university students who are at risk of eating disorders.
PURPOSE: To evaluate the criterion validity and diagnostic utility of the SCOFF, a brief eating disorder (ED) screening instrument, in a Mexican sample. METHODS: The study was conducted in two phases in 2012. Phase I involved the administration of self-report measures [the SCOFF and the Eating Disorder Inventory-2, (EDI-2)] to 1057 students aged 17-56 years (M age = 21.0, SD = 3.4; 67 % female) from three colleges at the Universidad Autónoma de San Luis Potosí, Mexico. In Phase II, a random subsample of these students (n = 104) participated in the eating disorder examination, a structured interview that yields ED diagnoses. Analyses were conducted to evaluate the SCOFF's criterion validity by examining (a) correlations between scores on the SCOFF and the EDI-2 and (b) the SCOFF's ability to differentiate diagnosed ED cases and non-cases. RESULTS: EDI-2 subscales showed high correlations with the SCOFF scores proving initial evidence of criterion validity. A score of two points on the SCOFF optimized the sensitivity (78 %) and specificity (84 %). With this cutoff, the SCOFF correctly classified over half the cases (PPV = 58 %) and screened out the majority of non-cases (NPV = 93 %) providing further evidence of criterion validity. Analyses were repeated separately for men and women, yielding gender-specific information on the SCOFF's performance. CONCLUSIONS: Taken as a whole, results indicated that the SCOFF can be a useful tool for identifying Mexican university students who are at risk of eating disorders.
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