The cross-section relationship, with 95% confidence intervals, between %BF and the physical activity index (approximately the square root of average number of steps per day) for boys and girls, combining data from all three measurement periods.

<p>The cross-section relationship, with 95% confidence intervals, between %BF and the physical activity index (approximately the square root of average number of steps per day) for boys and girls, combining data from all three measurement periods.