title: Why did soft drink consumption decrease but screen time not? Mediating mechanisms in a school-based obesity prevention program.
abstract: OBJECTIVE
  This paper aims to identify the mediating mechanisms of a school-based obesity prevention program (DOiT).
  
  
  METHODS
  The DOiT-program was implemented in Dutch prevocational secondary schools and evaluated using a controlled, cluster-randomised trial (September 2003 to May 2004). We examined mediators of effects regarding (1) consumption of sugar containing beverages (SCB); (2) consumption of high caloric snacks; (3) screen-viewing behaviour; and (4) active commuting to school. To improve these behaviours the DOiT-program tried to influence the following potentially mediating variables: attitude, subjective norm, perceived behavioural control, and habit-strength.
  
  
  RESULTS
  Both in boys (n = 418) and girls (n = 436) the DOiT-intervention reduced SCB consumption (between group difference in boys = -303.5 ml/day, 95% CI: -502.4;-104.5, between group difference in girls = -222.3 ml/day, 95% CI: -371.3;-73.2). The intervention did not affect the other examined behaviours. In girls, no intervention effect on hypothetical mediators was found nor evidence of any mediating mechanisms. Boys in intervention schools improved their attitude towards decreasing SCB consumption, while this behaviour became less of a habit. Indeed, attitude and habit strength were significant mediators of the DOiT-intervention's effect (4.5 and 3.8%, respectively) on SCB consumption among boys.
  
  
  CONCLUSIONS
  Our findings imply that interventions aimed at EBRB-change should be gender-specific. Future studies aimed at reducing SCB consumption among boys should target attitude and habit strength as mediating mechanisms. Our study did not resolve the mediating mechanisms in girls.
  
  
  BACKGROUND
  International Standard Randomised Controlled Trial Number Register ISRCTN87127361.
authors.affiliation: EMGO-Institute and Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands. m.chinapaw@vumc.nl
authors.forename: Marijke Jm
authors.initials: MJ
authors.lastname: Chin A Paw
authors.forename: Amika S
authors.initials: AS
authors.lastname: Singh
authors.forename: Johannes
authors.initials: J
authors.lastname: Brug
authors.forename: Willem
authors.initials: W
authors.lastname: van Mechelen