Page 115 - The efficacy and effectiveness of psychological treatments for eating disorders - Elske van den Berg
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  Chapter 6 115
 Participants were included if the follow-up period after BS was at least nine months, if they were older than 18 and if the bariatric surgical procedure was a malab- sorptive procedure or combined restrictive malabsorptive procedure. A nine-month follow-up period was chosen as a cut-off point given that surgical impact usually begins to decrease around one year post-operatively, and the influence of psycho- logical factors may, therefore, become more evident [16]. Since postoperative weight loss varies between restrictive procedures (e.g. gastric banding) and malabsorptive or combined malabsorptive procedures (e.g. gastric bypass), with greater weight loss occurring in patients undergoing malabsorptive or combined malabsorptive proce- dures, in this study participants who had undergone a restrictive procedure (N = 13) were excluded [16]. Self-report questionnaires were used to assess all participants. The self-report questionnaires were completed by 153 of the 186 participants. Partic- ipants who did not completed the self-report questionnaires were excluded from the final analysis. This study finally included 140 participants and it was conducted between June 2014 and June 2016.
The participants were assigned to a successful or a suboptimal weight loss group. The definition used for success was: percentage of excess weight loss (% EWL) of 50% or more at the time of completing the questionnaire. Percentage of EWL was calcu- lated as ((Δ pre-surgery weight and post-operative weight) / (initial weight – ideal weight)) X 100% [5, 7]. A body mass index (BMI) of 25 kg/m2 was used as the criterion for ideal weight.
To define successful weight loss, some studies recommend using a weight outcome measure that reduces the influence of initial BMI when comparing the results for patients with a lower and higher BMI; total body weight loss (TBWL) outcome measure [9]. Due to the fact that % EWL is the most commonly used metric, % EWL definition was used throughout this study [3, 6, 13, 21, 24, 38 ].
Central Committee on Human Research (CCMO) has waived the requirement of ethical approval. The CCMO has ruled that Dutch law on research with humans does not apply to the collection of anonymized retrospective information for routine procedures. All participants gave informed written consent before enrolment. The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request.






























































































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