An evaluation of the enhanced cognitive-behavioural model of bulimia nervosa
Highlights
► Both cognitive-behavioural models of bulimia nervosa provided a good fit to the data. ► The enhanced model accounted for more variance in dietary restraint and binge eating. ► The relationship between dietary restraint and binge eating was not supported.
Section snippets
Participants and procedures
Participants were female patients with an eating disorder who were referred and assessed for treatment at an outpatient mental health service in Perth, Western Australia. Data were collected upon initial presentation as part of a larger assessment protocol between April 2005 and November 2010. Height and weight were measured during the initial assessment to obtain body mass index (BMI; weight/height2). The Eating Disorder Examination (EDE; Fairburn & Cooper, 1993) was administered to determine
Preliminary data analysis
Missing data were observed for 11 cases (15 missing values in total), and were imputed using expectation–maximisation in SPSS. No missing data were observed on key outcome variables (e.g., binge eating, purging).
Histograms of model variables were inspected for normality. The distribution of binge eating and purging was suggestive of substantial positive skew. Binge eating and purging variables were transformed using square root transformation, which substantially reduced the skew statistics.
Discussion
This study aimed to evaluate the original and enhanced CB-BN models with a sample of patients seeking treatment for BN or atypical BN. Goodness-of-fit indices suggested that both the original and enhanced models of BN provided a good fit to the data, and both models accounted for a similar proportion of variance in purging. However, results indicated that the enhanced model accounted for a greater proportion of variance in dietary restraint and binge eating than the original model. This
Acknowledgements
Ms Lampard acknowledges the support of the Butterfly Foundation, a UWA Convocation Travel Award, and a UWA Completion Scholarship.
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