Ariza C, et al. - Researchers assessed the cumulative incidence rate (CIR) of obesity at 1-year following the implementation of a quasi-experimental, multicomponent, obesity primary prevention intervention conducted in Barcelona, Spain, in schoolchildren aged 9–10 y. A 9-session classroom program, 6 weekly sessions of physical education and out-of-school physical activity, and a workshop for families were the components of this intervention. An intervention group (IG) included 1464 students and a comparison group (CG) included 1609 students. They assessed the link between the intervention and the CIR of obesity by using a multilevel logistic regression model and used Cohen's criteria to determine the effect size of the program. At baseline, 12.7% overall prevalence of obesity was reported. They noted 7.8% vs 11.4% incidence of obesity in the IG vs in the CG, respectively, at 12-mo follow-up, representing 31% fewer new cases of obesity in the IG. They noted attenuation in the incidence of obesity as measured by adiposity in children aged 9–10 y as a result of the first Prevención de la Obesidad Infantil en Barcelona (Childhood Obesity Prevention in Barcelona) (POIBA) intervention. In this age range, 1 in 3 new cases of childhood obesity could be prevented with the intervention.