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Child Behaviour Checklist (filled in by parents)
The Child Behaviour Checklist (CBCL) is a questionnaire assigning quantitative scores to behaviour problems and competencies of children and adolescents at 4 to 18 years of age. The CBCL was filled out by parents or other caregivers. It is composed of 20 competence items and 118 behaviour problem items grouped into four competence scales and 11 problem scales. The competence scales include: activities (amount and quality of participation in sports, hobbies, games as well as jobs and chores), social (number and quality of relationships with others and involvement in organizations), school (an index of competence in school) and total competence score obtained summing the activities, social and school scales (a global index of adaptive functioning). The problem scales include eight syndrome scales: withdrawal, somatic complaints, social problems, anxiety/depression, thought problems, attention problems, delinquent behaviour, and aggressive behaviour; 2 psychopathology scales, internalizing and externalizing and, lastly, a total problem score, an overall index of the reported problems (16,17).
Youth Self-Report (filled in by the adolescents)
The Youth Self-Report (YSR) provides self-ratings for the same competence and problem items as those of the CBCL. The YSR also includes open-ended responses to items covering physical problems, concerns, and strengths. The adolescents rate themselves for how true each item is now or was within the past 6 months, using the same 3-point response scale as the CBCL (16,18,19).
Child Eating Disorder Examination-Questionnaire
The Child Eating Disorder Examination Questionnaire (ChEDE-Q)measures 3 forms of overeating: objective bulimic episodes, subjective bulimic episodes and objective overeating episodes. The ChEDE-Q also measures four methods of weight control: self-induced vomiting, laxative misuse, diuretic misuse and intense exercising (20). The items of the ChEDE-Q are derived from the initial eating disorder examination interview (21). The ChEDE-Q was modified to make it suitable for use in populations of Dutch children and is more concrete and simpler for children.
Inclusion and exclusion criteria
Adolescents are eligible when they meet the following inclusion criteria: 1) age of 12-18 years; 2) overweight or obesity according the definition of Cole et al. (15). Exclusion criteria for the study are: not Dutch-speaking, overweight/obesity as a result of a known syndrome or organic cause (hypothyroidism), mental retardation, physical limitations and diagnosed diabetes mellitus type 2.
Study design
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