Internal consistency and validity of the BITE for the screening of bulimia nervosa in university students, Colombia

Neuropsychiatry Research Group, Facultad de Medicina, Universidad Autónoma de Bucaramanga, UNAB, Bucaramanga, Colombia.
Eating and weight disorders: EWD (Impact Factor: 0.79). 07/2008; 13(2):e35-9.
Source: PubMed


To establish the validity and internal consistency of the bulimic investigatory test, Edinburgh (BITE) in a non-clinical population of university students in Colombia.
A validation study with a cross-sectional sampling was designed. Two-hundred and sixty-one students were evaluated independently and blindly with BITE and the Composite International Diagnostic Interview. Kuder-Richardson's test, sensitivity, specificity, predictive values, likelihood values, Cohen kappa, area under the ROC curve for BITE's symptoms scale and Cronbach's alpha for severity scale were computed.
The Kuder-Richardson's test was 0.86, two factors were identified which explain the 22.68% and 7.12% of variance. Cronbach's alpha for severity scale was 0.52. Area under ROC curve was 0.9736. The best cutoff point was 11 with sensitivity of 94.59%, specificity of 91.52%, positive predictive value of 64.81%, negative predictive value of 99.03%; with a concordance of 0.7226.
The BITE's symptom scale is useful in identifying clinically binge-eaters in university students.

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Available from: Paul Anthony Camacho Lopez, Apr 15, 2015
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    • "High scores in Symptoms Scale give a high probability of meeting the criteria of bulimia nervosa, whereas high scores in Severity Scale should lead to further investigation. BITE as a test presents with high validity and internal consistency [5]. The majority of manifestations of bulimia nervosa being apparent in the head, neck and oral cavity qualify the dentist to identify the problem and guide the patient through coordinated care [6]. "

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    ABSTRACT: El objetivo de este estudio instrumental fue examinar la estructura factorial y la invarianza de medición a través del sexo y la edad del Bulimic Investigatory Test, Edinburgh (BITE) en una muestra comunitaria de adolescentes no clínicos. La muestra la formaron 1.794 adolescentes (50,2% varones), con una edad medida de 14,7 años (DT = 1,72). Los resultados mostraron que el BITE es un instrumento de medida que presenta adecuadas propiedades psicométricas. El nivel de consistencia interna para la subescala Síntomas fue 0,95, mientras que para la subescala de Gravedad fue de 0,70. El estudio de la dimensionalidad del BITE mediante análisis factorial exploratorio mostró una solución esencialmente unidimensional. Los índices de bondad de ajuste para el modelo unidimensional sometido a prueba en el análisis factorial confirmatorio fueron adecuados. Más aún, esta estructura dimensional del BITE se mostró invariante en función del género y la edad. Se encontraron diferencias estadísticamente significativas en función del género y la edad cuando se compararon las medias latentes. Futuros estudios deberían incorporar los avances relacionados con la evaluación psicológica y educativa como la construcción de tests adaptativos computerizados, así como examinar la invarianza de medición de la sintomatología bulímica a través de las culturas.
    Full-text · Article · Jan 2011 · International Journal of Clinical and Health Psychology
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    ABSTRACT: To compare the validity of the Eating Attitudes Test (EAT) and the Bulimic Investigatory Test Edinburgh (BITE) as screening tools for eating disorders (EDs), and to identify a new threshold for each questionnaire to detect ED cases among dance and nondance students. Dance students enrolled in high schools with gifted dance programs and nondance students randomly chosen from the same or nearby schools were invited to participate in a 2-phase ED survey. Participants completed the EAT and BITE questionnaires in the first phase. All participants who screened positive and 10% of the participants who screened negative were interviewed blindly using the Structured Clinical Interview for DSM-IV-TR Axis I Disorders Patient Edition. The BITE had better accuracy than the EAT in detecting ED in general among both dance and non-dance students. BITE scores of 19 and 16 were the optimal cutoff values for determining ED among dance and nondance students, respectively. The optimal cutoff value for the EAT to diagnose an ED was 19 for dance students and 12 for nondance students. Both questionnaires showed higher sensitivity and lower specificity in dance students than nondance students at the same cutoff points. The BITE had better diagnostic performance than the EAT in this nonclinical population, although its ability to detect restrictive behaviors is likely as limited as that of the EAT. Plausible explanations for these results and limitations of this study are discussed in the text. © 2013 Wiley Periodicals, Inc. (Int J Eat Disord 2013).
    Full-text · Article · Jan 2014 · International Journal of Eating Disorders
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