Correction to: Int J Obes advance online publication, 15 July 2008; doi:10.1038/ijo.2008.99

Since the publication of the above paper, the authors have noticed an omission in the legend of Figure 2 and they wish to modify it slightly. The amended Figure 2 is reproduced below.

Figure 2
figure 1

Prevalence of overweight in initially non-overweight participants, taking into account the cluster randomization design, adjusted for gender, sexual maturity, socioeconomic status, baseline participation to sports club, baseline stratification and their interactions with time. Overweight was defined according to the International Obesity Task Force.32 The number of initially non-overweight students was 731 at baseline, 653 at 2 years, 605 at 3 years and 571 at 4 years. P-value is given for intervention effect.

The authors apologize for the errors.