Table 3: NNT and estimates of effect, in millions, for percent body fat.

StudyNNT (95% CI)E1 (95% CI) (millions)E2 (95% CI) (millions)

Atlantis et al. [42] 4 (3, 18)2.8 (4.7, 0.7)24.5 (41.7, 0.6)
McGovern et al. [43]3 (3, 6)3.6 (4.7, 2.1)31.5 (41.7, 18.5)

Notes: NNT: number-needed-to treat; E1: estimate 1 derived from number of obese children and adolescents in the United States who could benefit from exercise (based on a previously estimated 12.5 million obese children and adolescents) [4]; E2: estimate 2 derived from number of overweight and obese children in the world who could benefit from exercise (based on a previously estimated 110 million overweight or obese children) [2, 38].