Table 3.

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

Study	NNT (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].