Effectiveness of a population-scaled, school-based physical activity intervention for the prevention of childhood obesity

ObjectiveThe aim of this study was to examine the effectiveness of a real-world, population-scaled, school-based physical activity (PA) intervention that provided two to three additional physical education lessons per week to children aged 6 to 14 years in Slovenia. MethodsMore than 34,000 participants from over 200 schools were compared with a similar number of nonparticipants from the same schools. Generalized estimating equations were used to estimate the effects of differing levels of exposure to the intervention (i.e., from 1-5 years) on BMI in children with normal weight, overweight, or obesity at baseline. ResultsBMI was lower in the intervention group, irrespective of participation duration or baseline weight status. The difference in BMI increased with the program duration, with maximal effects being seen after 3 to 4 years of participation, and was consistently larger for children with obesity (peaking at 1.4 kg/m(2) [95% CI: 1.0-1.9] for girls with obesity and peaking at 0.9 kg/m(2) [95% CI: 0.6-1.3] for boys with obesity). The program started to become effective at reversing obesity after 3 years, whereas the lowest numbers needed to treat (NNTs) were observed after 5 years (NNTs = 17 for girls and 12 for boys). ConclusionsThe population-scaled, school-based PA intervention was effective in preventing and treating obesity. The effects were the greatest in children initially presenting with obesity, such that the program was able to benefit children needing support the most.

Automated summary

This study examined the effectiveness of a population-scaled, school-based physical activity intervention in Slovenia, which provided additional physical education lessons to children aged 6 to 14. The intervention group showed lower BMI compared to nonparticipants, regardless of participation duration or baseline weight status. The program was most effective in children with obesity and had the largest impact after 3 to 4 years of participation.