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Why did soft drink consumption decrease but screen time not? Mediating mechanisms in a school-based obesity prevention program.

Chin A Paw MJ, Singh AS, Brug J, van Mechelen W - Int J Behav Nutr Phys Act (2008)

Bottom Line: In girls, no intervention effect on hypothetical mediators was found nor evidence of any mediating mechanisms.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.Our study did not resolve the mediating mechanisms in girls.

View Article: PubMed Central - HTML - PubMed

Affiliation: EMGO-Institute and Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands. m.chinapaw@vumc.nl

ABSTRACT

Objectives: 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.

Conclusion: 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.

Trial registration: International Standard Randomised Controlled Trial Number Register ISRCTN87127361.

No MeSH data available.


Related in: MedlinePlus

Conceptual mediational model: The DOiT program affects energy balance related behaviours indirectly through mediator variables.
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Figure 2: Conceptual mediational model: The DOiT program affects energy balance related behaviours indirectly through mediator variables.

Mentions: The DOiT-program was hypothesized to change the following mediators: attitude, subjective norm, behavioural control, habit strength concerning specific EBRBs. Figure 1 shows an example of intervention materials and strategies used to change each of the hypothesized determinants. In turn these mediators would produce changes in (1) consumption of sugar containing beverages, i.e. consumption of soft drinks and fruit juices; (2) consumption of high caloric snacks, i.e. consumption of savoury and sweet snacks; (3) screen-viewing behaviour, i.e. time spent on television viewing and computer use; and (4) active commuting to school (see figure 2). The intervention consisted of an individual component and an environmental component. The individual component consisted of an educational program covering eleven lessons for the subjects biology and physical education. The environmental component involved encouraging additional physical education classes and changes at school cafeterias. Control schools were requested to maintain their regular curriculum.


Why did soft drink consumption decrease but screen time not? Mediating mechanisms in a school-based obesity prevention program.

Chin A Paw MJ, Singh AS, Brug J, van Mechelen W - Int J Behav Nutr Phys Act (2008)

Conceptual mediational model: The DOiT program affects energy balance related behaviours indirectly through mediator variables.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2542394&req=5

Figure 2: Conceptual mediational model: The DOiT program affects energy balance related behaviours indirectly through mediator variables.
Mentions: The DOiT-program was hypothesized to change the following mediators: attitude, subjective norm, behavioural control, habit strength concerning specific EBRBs. Figure 1 shows an example of intervention materials and strategies used to change each of the hypothesized determinants. In turn these mediators would produce changes in (1) consumption of sugar containing beverages, i.e. consumption of soft drinks and fruit juices; (2) consumption of high caloric snacks, i.e. consumption of savoury and sweet snacks; (3) screen-viewing behaviour, i.e. time spent on television viewing and computer use; and (4) active commuting to school (see figure 2). The intervention consisted of an individual component and an environmental component. The individual component consisted of an educational program covering eleven lessons for the subjects biology and physical education. The environmental component involved encouraging additional physical education classes and changes at school cafeterias. Control schools were requested to maintain their regular curriculum.

Bottom Line: In girls, no intervention effect on hypothetical mediators was found nor evidence of any mediating mechanisms.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.Our study did not resolve the mediating mechanisms in girls.

View Article: PubMed Central - HTML - PubMed

Affiliation: EMGO-Institute and Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands. m.chinapaw@vumc.nl

ABSTRACT

Objectives: 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.

Conclusion: 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.

Trial registration: International Standard Randomised Controlled Trial Number Register ISRCTN87127361.

No MeSH data available.


Related in: MedlinePlus