title: Design and evaluation protocol of "FATaintPHAT", a computer-tailored intervention to prevent excessive weight gain in adolescents.
abstract: BACKGROUND
  Computer tailoring may be a promising technique for prevention of overweight in adolescents. However, very few well-developed, evidence-based computer-tailored interventions are available for this target group. We developed and evaluated a computer-tailored intervention for adolescents targeting energy balance-related behaviours: i.e. consumption of snacks, sugar-sweetened beverages, fruit, vegetables, and fibre, physical activity, and sedentary behaviours. This paper describes the planned development of a school-based computer-tailored intervention aimed at improving energy balance-related behaviours in order to prevent excessive weight gain in adolescents, and the protocol for evaluating this intervention.
  
  
  METHODS
  Intervention development: Informed by the Precaution Adoption Process Model and the Theory of Planned Behaviour, the computer-tailored intervention provided feedback on personal behaviour and suggestions on how to modify it. The intervention (VETisnietVET translated as 'FATaintPHAT') has been developed for use in the first year of secondary school during eight lessons. Evaluation design: The intervention will be evaluated in a cluster-randomised trial including 20 schools with a 4-months and a 2-years follow-up. Outcome measures are BMI, waist circumference, energy balance-related behaviours, and potential determinants of these behaviours. Process measures are appreciation of and satisfaction with the program, exposure to the program's content, and implementation facilitators and barriers measured among students and teachers.
  
  
  CONCLUSIONS
  This project resulted in a theory and evidence-based intervention that can be implemented in a school setting. A large-scale randomised controlled trial with a short and long-term follow-up will provide sound statements about the effectiveness of this computer-tailored intervention in adolescents.
  
  
  BACKGROUND
  ISRCTN15743786.
authors.affiliation: Department of Public Health, Erasmus University Medical Center, Rotterdam, The Netherlands. n.ezendam@erasmusmc.nl.
authors.forename: Nicole P M
authors.initials: NP
authors.lastname: Ezendam
authors.forename: Anke
authors.initials: A
authors.lastname: Oenema
authors.forename: Petra M
authors.initials: PM
authors.lastname: van de Looij-Jansen
authors.forename: Johannes
authors.initials: J
authors.lastname: Brug
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D001521:Behavior Therapy; D003194:Computer-Assisted Instruction / Q000379:methods*; D015444:Exercise / Q000502:physiology; D005260:Female; D015438:Health Behavior; D006266:Health Education / Q000379:methods*; D006293:Health Promotion / Q000379:methods; D006801:Humans; D007899:Leisure Activities; D008297:Male; D050177:Overweight / Q000517:prevention & control*; D040242:Risk Reduction Behavior; D012572:School Health Services / Q000458:organization & administration* / Q000706:statistics & numerical data